Timer1 Crystal question

Imanjl · Joined: 15 Nov 2004 Posts: 42

Is it possible to run the Timer1 OSC with 1Mhz external crystal ? I see 18F reference and it suggested value in 32-200Khz range .

If yes what Capacitor value should I use for 1Mhz?

PIC=18f452 ,Freq=40Mhz.

Thx .

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

From the 18F452 data sheet:

Imanjl · Joined: 15 Nov 2004 Posts: 42

if I set the timer to operate with internal oscillator it can reach to 10mhz freq when PIC run at 40Mhz .

I think an external clock with 1Mhz Freq can solve the problem ,but I dont have access to external clock source in my board .

Is it possible to connect the PWM output of PIC to timer1 clock input ?
I want to drive the timer with PWM module .

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Imanjl · Joined: 15 Nov 2004 Posts: 42

Thanks PCM programmer It was done with a piece of wire .