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Pic18f4520 Timer1 doesn't work with external clock!

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cchappyboy

Joined: 03 Dec 2008
Posts: 45

Pic18f4520 Timer1 doesn't work with external clock!

Posted: Tue Jun 22, 2010 4:00 pm

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I used PIC18f4520 and want to make a Real time clock using external clock. That is a 32.768K crystal sit on the pin 15 and pin 16.
The configuration for timer1 is like this

Code:

setup_timer_1(t1_external);
set_timer1(0x00);//around 1s
enable_interrupts(int_timer1);
enable_interrupts(global);

but it doesn't work. Because I monitored Timer1 register, use get_timer1(); it always =0.

Then I try another way to use internal clock.

Code:

setup_timer_1(t1_internal);
set_timer1(0xbdb);//62.5ms
enable_interrupts(int_timer1);
enable_interrupts(global);

It works.

Do you know what is the problem when I setup to external clock?
Thanks for your response.

PCM programmer

Joined: 06 Sep 2003
Posts: 21708


Posted: Tue Jun 22, 2010 4:27 pm

This post shows how to setup Timer1 to use an external 32.768 KHz crystal: http://www.ccsinfo.com/forum/viewtopic.php?t=25824&start=7

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