; VIDEO COMPOSITE PAL IO DEVICE ; Implemented following timings in http://blog.retroleum.co.uk/electronics-articles/pal-tv-timing-and-voltages/ ; Every line, for 52 times, it loads a byte from memory into PORTA register and then shifts the byte to the left to show another bit (do it 7 times) ; This also displays byte's MSB pixel "for free", as the video pin is PD7 (last bit of PORTA). ; ; INTERFACING WITH PAT80: ; Use PortB as data port. Before writing anything, issue a read (pin RW HIGH) and check the busy pin on the data port. ; If the busy pin is high, retry reading until goes low. When the busy pin goes low, we have... TODO ; ; ELECTRONICALLY: ; The data port D0 (= PB0) is tied to ground with a 1KOhm resistance. When the MC is busy drawing the screen, the data port is in ; high impedance state, so that avoids causing bus contention, but when read returns a 0bXXXXXXX0 byte. When the MC starts vsync, ; begins checking the port for data... TODO ; ; PINS: ; Video pin: PA0 (pin 1) ; Sync pin: PC0 (pin 22) ; Debug hsync pin: PC1 (pin 23) ; ; STATUS TABLE: ; R25 (STATUS): Current status (what the interrupt should do when fired): ; 0, 1, 2, 3, 4 = long sync ; 5, 6, 7, 8, 9 = short sync ; 10 = draw lines (draw 304 lines complete with line sync and back porch, then start short ; sync: sync pin low and next interrupt after 2uS) ; 11, 12, 13, 14, 15, 16 = short sync ; 17-255 = invalid state or screen draw finished: set to 0 and restart from first long sync start .include "m1284def.inc" ; registers .def A = r0 ; accumulator .def STATUS = r25 ; signal status (see STATUS TABLE) ; define constant .equ SYNC_PIN = PC0 ; Sync pin (pin 22) .equ DEBUG_PIN = PC1 ; DEBUG: Single vertical sync pulse to trigger oscilloscope (pin 23) .equ TIMER_DELAY_30US = 65535 - 704 ; 719 cycles @ 24Mhz .equ TIMER_DELAY_2US = 65535 - 47 ; 48 cycles @ 24Mhz ; memory .equ FRAMEBUFFER = 0x100 ; start vector .org 0x0000 rjmp main ; reset vector: jump to main label .org 0x001E rjmp on_tim1_ovf ; interrupt for timer 1 overflow .org 0x40 ; main program main: ; pins setup sbi DDRC, SYNC_PIN ; set pin as output sbi DDRC, DEBUG_PIN ; set pin as output ldi r16, 0xFF out DDRA, r16 ; set port as output (contains video pin) ; *** Load data into ram *** ; Set X to 0x0100 ldi r27, high(FRAMEBUFFER<<1) ldi r26, low(FRAMEBUFFER<<1) ; Set Z to 0x1000 (cat image) ldi r31, high(CAT_IMAGE<<1) ldi r30, low(CAT_IMAGE<<1) load_mem_loop: lpm r17, Z+ ;ldi r17, 0b00001111 st X+, r17 ; if reached the last framebuffer byte, exit cycle cpi r27, 0b00111110 brne load_mem_loop ; if not 0, repeat h_picture_loop cpi r26, 0b11000000 brne load_mem_loop ; if not 0, repeat h_picture_loop ; *** timer setup (use 16-bit counter TC1) *** ; The Power Reduction TC1 and TC3 bits in the Power Reduction Registers (PRR0.PRTIM1 and ; PRR1.PRTIM3) must be written to zero to enable the TC1 and TC3 module. ldi r16, 0b00000000 sts PRR0, r16 ; Set timer prescaler to 1:1 LDI r16,0b00000001 sts TCCR1B,r16 ; Enambe timer1 overflow interrupt LDI r16,0b00000001 STS TIMSK1,r16 ; Enable interrupts globally SEI ; Timer setup completed. ; loop forever forever: jmp forever ; ********* FUNCTIONS CALLED BY INTERRUPT *********** on_tim1_ovf: ; debug ; sbi PORTC, DEBUG_PIN ; high ; cbi PORTC, DEBUG_PIN ; low ; ; set timer in 30uS (reset timer counter) ; ldi r27, high(TIMER_DELAY_30US) ; ldi r26, low(TIMER_DELAY_30US) ; sts TCNT1H,r27 ; sts TCNT1L,r26 ; reti ; debug ; called by timer 1 two times per line (every 32 uS) during hsync, unless drawing picture. ; if STATUS >= 17 then STATUS=0 cpi STATUS, 17 brlo switch_status clr STATUS ; check status and decide what to do switch_status: cpi STATUS, 5 brlo long_sync ; 0-4: long sync cpi STATUS, 10 ; 5-9: short sync breq draw_picture ; 10: draw picture jmp short_sync ; 11-16: short_sync ; reti is at end of all previous jumps draw_picture: ; increment status inc STATUS ; set X register to framebuffer start 0x0100 ; (set it a byte before, because it will be incremented at first) clr r27 ldi r26, 0xFF ; start 304 picture lines ldi r17, 152 ; line counter h_picture_loop: ; debug ; sbi PORTC, DEBUG_PIN ; high ; cbi PORTC, DEBUG_PIN ; low ; debug ; ***************** DRAW FIRST LINE ********************* ; **** start line sync: 4uS, 96 cycles @ 24Mhz ; video pin goes low before sync clr r19 ; 1 cycle out PORTA, r19 ; 1 cycle cbi PORTC, SYNC_PIN ; sync goes low (0v) ; 2 cycle ldi r18, 31 ; 1 cycle l_sync_pulse_loop: ; requires 3 cpu cycles dec r18 ; 1 cycle brne l_sync_pulse_loop ; 2 cycle if true, 1 if false sbi PORTC, SYNC_PIN ; sync goes high (0.3v) ; **** end line sync ; **** start line back porch: 8uS, 192 cycles @ 24Mhz ; leave time at the end for line setup and draw_line call ldi r18, 62 ; 1 cycle l_sync_back_porch_loop: dec r18 ; 1 cycle brne l_sync_back_porch_loop ; 2 cycle if true, 1 if false ; **** end back porch call draw_line ; 3 cycles (+ 3 to come back to on_line_drawn) ; **** draws line pixels: 52uS, 1248 cycles @ 24Mhz **** ; ***************** DRAW SECOND LINE ********************* ; **** start line sync: 4uS, 96 cycles @ 24Mhz ; video pin goes low before sync clr r19 ; 1 cycle out PORTA, r19 ; 1 cycle cbi PORTC, SYNC_PIN ; sync goes low (0v) ; 2 cycle ldi r18, 31 ; 1 cycle l_sync_pulse_loop2: ; requires 3 cpu cycles dec r18 ; 1 cycle brne l_sync_pulse_loop2 ; 2 cycle if true, 1 if false sbi PORTC, SYNC_PIN ; sync goes high (0.3v) ; **** end line sync ; **** start line back porch: 8uS, 192 cycles @ 24Mhz ; leave time at the end for line setup and draw_line call ldi r18, 62 ; 1 cycle l_sync_back_porch_loop2: dec r18 ; 1 cycle brne l_sync_back_porch_loop2 ; 2 cycle if true, 1 if false ; **** end back porch call draw_line ; 3 cycles (+ 3 to come back to on_line_drawn) ; **** draws line pixels: 52uS, 1248 cycles @ 24Mhz **** ; debug ; sbi PORTC, DEBUG_PIN ; high ; cbi PORTC, DEBUG_PIN ; low ; debug dec r17 ; decrement line countr ; 1 cycle brne h_picture_loop ; if not 0, repeat h_picture_loop ; 2 cycle if true, 1 if false ; end picture lines ; video pin goes low before sync clr r19 ; 1 cycle out PORTA, r19 ; 1 cycle ; debug ; sbi PORTC, DEBUG_PIN ; high ; cbi PORTC, DEBUG_PIN ; low ; debug ; immediately start first end-screen short sync (set timer in 0uS): ;ldi r27, 0xFF ;ldi r26, 0xFF ;sts TCNT1H,r27 ;sts TCNT1L,r26 reti ; end draw_picture long_sync: ; long sync: 30uS low (719 cycles @ 24Mhz), 2uS high (48 cycles @ 24Mhz) inc STATUS ; increment status counter sbis PORTC, SYNC_PIN ; if sync is high (sync is not occuring) skip next line jmp long_sync_end ; sync pin is high (sync is not occuring) cbi PORTC, SYNC_PIN ; sync goes low (0v) ; 2 cycle ; set timer in 30uS (reset timer counter) ldi r27, high(TIMER_DELAY_30US) ldi r26, low(TIMER_DELAY_30US) sts TCNT1H,r27 sts TCNT1L,r26 reti long_sync_end: ; sync pin is low (sync is occuring) sbi PORTC, SYNC_PIN ; sync goes high (0.3v) ; set timer in 2uS: ldi r27, high(TIMER_DELAY_2US) ldi r26, low(TIMER_DELAY_2US) sts TCNT1H,r27 sts TCNT1L,r26 reti short_sync: ; short sync: 2uS low (48 cycles @ 24Mhz), 30uS high (720 cycles @ 24Mhz) inc STATUS ; increment status counter sbis PORTC, SYNC_PIN ; if sync is high (sync is not occuring) skip next line jmp short_sync_end ; sync pin is high (sync is not occuring) cbi PORTC, SYNC_PIN ; sync goes low (0v) ; 2 cycle ; set timer in 2uS (reset timer counter) ldi r27, high(TIMER_DELAY_2US) ldi r26, low(TIMER_DELAY_2US) sts TCNT1H,r27 sts TCNT1L,r26 reti short_sync_end: ; sync pin is low (sync is occuring) sbi PORTC, SYNC_PIN ; sync goes high (0.3v) ; set timer in 30uS: ldi r27, high(TIMER_DELAY_30US) ldi r26, low(TIMER_DELAY_30US) sts TCNT1H,r27 sts TCNT1L,r26 reti draw_line: ; NO loops, as this is time-strict ; 52 chunks of 8 pixels ; chunk 1 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 2 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 3 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 4 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 5 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 6 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 7 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 8 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 9 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 10 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 11 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 12 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 13 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 14 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 15 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 16 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 17 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 18 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 19 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 20 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 21 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 22 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 23 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 24 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 25 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 26 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 27 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 28 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 29 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 30 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 31 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 32 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 33 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 34 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 35 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 36 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 37 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 38 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 39 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 40 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 41 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 42 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 43 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 44 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 45 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 46 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 47 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 48 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 49 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 50 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 51 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ; chunk 52 ld r0, X+ ; load pixel ; 2 cycles out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle nop ; 1 cycle lsr r0 ; 1 cycle out PORTA, r0 ; 1 cycle ret .include "cat.asm"