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.include <m8535def.inc>

.org 0x0000
rjmp Reset

.org OVF0addr
rjmp michi

.org OC0addr
rjmp PWM


Reset:

ldi R26, 0b00000000

ldi R16, HIGH(RAMEND)
out SPH, R16

ldi R16, LOW(RAMEND)
out SPL, R16

ldi R16, 0b00000001
out TCCR0, R16

ldi R16, 0b00000011
out TIMSK, R16

ldi R17, 1
out OCR0, R17

sei



loop1:
ldi R27, 0b00000001
out DDRA, R27
ldi R16, 0b00000010
out DDRA, R16
rjmp loop1
loop2:
ldi R27, 0b00000001
out DDRA, R27
ldi R16, 0b00000000
out DDRA, R16
rjmp loop2

PWM:

out TCNT0, R26
out OCR0, R17
sei
sbis DDRA, 1
rcall loop1
rcall loop2

michi:
reti

mfg
Michael