attiny13 int0中断问题
.include "tn13def.inc".org $0
rjmp start
.org $01
rjmp int0_0
start:
ldi r16,0b00000001
out mcucr,r16
ldi r16,0b01000000
out gimsk,r16
sei
xxx:rjmp xxx
int0_0:
cli
rcall ledf
reti
ledf:
ldi r16,0xff
out ddrb,r16
ldi r21,0x4
xx:
cbi portb,3
rcall delay
sbi portb,3
rcall delay
dec r21
brne xx
ret
delay:
ldi r20,0x04
l3:ldi r18,0xff
l2:ldi r19,0xff
l1:dec r19
brne l1
dec r18
brne l2
dec r20
brne l3
ret
如上，中断可以触发，led本来按设想是闪烁4次，不过程序跑下来，是8次，而且闪了之后中断就不能触发了，求大牛解惑
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