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Can Timer1 be used to PWM on CCP1 / CCP2 ?

 
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jruibarroso



Joined: 07 Jan 2006
Posts: 64
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Can Timer1 be used to PWM on CCP1 / CCP2 ?
PostPosted: Fri Nov 17, 2006 11:31 am     Reply with quote
I'm using this on a PIC16F877 :

void main() {

setup_timer_2(T2_DIV_BY_ 1, 130, 1); // 38KHz
setup_ccp1(CCP_PWM);
setup_ccp2(CCP_PWM);


set_pwm1_duty(DutyVariable1); // 1 to 99 duty cicle
set_pwm2_duty(DutyVariable2);

But as far as I know , TIMER2 only handle 8 bits. Can i use TIMER1 insted to use it 16Bit resolution ?
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Fri Nov 17, 2006 1:27 pm     Reply with quote
No, you can't use Timer1. Only Timer2 is used with the hardware
PWM modules in the 16F877. This is shown in the block diagram
in section 8.3 of the data sheet.

The best resolution you can get is 10 bits.
http://www.ccsinfo.com/forum/viewtopic.php?t=18259
http://www.piclist.com/techref/microchip/pwmrescalc.htm
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