pic10f206没有溢出标志，怎么判断定时器是否溢出

chkmsfc

xiexie

yangsen

溢出会不会产生中断啊？有的话查中断标志位

chkmsfc

这颗IC没有定时器溢出标志

fslily

哪定时器怎样用

miscell

查询计数器的值

millwood0

1. 
   
2. if (counter < counter_previous) {
   
3.   counter_ovf=1; //counter overflow flag set
   
4.   counter_previous = counter;
   
5. }
   

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if you use a function to wrap around it, it would be even better.

tt98

这个IC没有中断的！

millwood0

another approach is to use the msb of TMR0 as a flag: once TMR0's highest bit is set, you consider the tmr has overflown, so you clear it and return 1.

Something like this should works - it works on a 12F675:

1. 
   
2. 
   
3. //test if tmr0 has overflown
   
4. //return 1 if it has
   
5. //return 0 otherwise
   
6. unsigned char tmr0_ovf(void) {
   
7.   if (TMR0 & 0x80) {
   
8.     TMR0 = TMR0 & (~0x80); //clear msb of tmr0
   
9.     return ~0;
   
10.   } else return 0;
    
11. }
    

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so all you need to do is to test tmr0_ovf().