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pic16f877 and cascading timers

 
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Mark P
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pic16f877 and cascading timers
PostPosted: Thu Oct 19, 2006 10:06 am     Reply with quote
Is it possible to to set up a second timer to count the overflows of the first timer without using an isr?

Thank you for your help, I've been digging around on the net and the data sheet and it's just not jumping out to me on how to set it up.
asmallri



Joined: 12 Aug 2004
Posts: 1635
Location: Perth, Australia

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PostPosted: Thu Oct 19, 2006 10:21 am     Reply with quote
An alternative approach is to periodically sample the TimerIF flag in the mainline loop. Whenever the flag is set you clear it and increment your variable.

This mechanism works fine for long delays provided you do not make calls to code that consumes 100% PIC CPU cycles to execute such as doing serial I/O to the software UART, using delay_ms(xxx) functions that sort of thing.
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