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counter1 question

 
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leto



Joined: 02 Aug 2005
Posts: 14

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counter1 question
PostPosted: Sat Jul 22, 2006 8:16 pm     Reply with quote
Hi,

I want to use two external counters through timer0 and timer1.
I have a PIC18F452 with RA4 and RC0 pull-down through 10k resistors to GND. I want to count every rising edge of the external clock input.

Timer0 works ok but timer1 lose the first pulse and begin the count after it.

Anyone knows the reason?

here my setup counters

Code:

   setup_timer_0(RTCC_EXT_L_TO_H|RTCC_DIV_1);   // setup counter 1
   set_timer0(0);                                                       // Clear counter 1
   setup_timer_1(T1_EXTERNAL_SYNC);                     // setup counter 2
   set_timer1(0);                                                      // clear counter 2
epideath



Joined: 07 Jun 2006
Posts: 47

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PostPosted: Sat Jul 22, 2006 10:51 pm     Reply with quote
Take a look at the errata PDF file here is a link to it

http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1335&dDocName=en010296

It talks about just this problem.

It basically says that The Timer is expecting a falling edge before the first rising edge. It gives some example work arounds for the problem

Regards
Guest
PostPosted: Sun Jul 23, 2006 9:01 am     Reply with quote
Yes, the hardware has a bug.
I could solve it with a little code.

Thank you.


Code:

   output_high(pin_c0);
   output_low(pin_c0);
   if (input(pin_c0)) {};
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