neingeist
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arduinisten
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NASM

.INCLUDE "tn13def.inc"
; data direction = output
sbi DDRB, 1 ; PB1
loop:
; clear bit
cbi PORTB, 1
; wait
14 years ago
; takes roughly ((2+2)*(256*256))/(9.6*1000*1000/8) ~ .218 seconds.
; 2 cycles SBIW + 2 cycles BRNE for 256*256 subtractions
; 9.6 MHz (CKSEL[1..0] = 10) with CKDIV=8
loop1:
sbiw ZL, 1
brne loop1
; set bit
sbi PORTB, 1
; wait
loop2:
sbiw ZL, 1
brne loop2
; again! again! again!
rjmp loop