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#int_tmr0 Help

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ritchie

Joined: 13 Sep 2003
Posts: 87

#int_tmr0 Help

Posted: Thu Dec 18, 2003 7:39 pm

Hello,

I'm planning to use the RTC of my PIC18F452 to tic every seconds at 20MHz clock.

I put instructions into my code as stated below:

Code:

#int_timer0
timer0_isr() {
seconds++; // This interrupt occurs every second
ticxf = 1; // set timer flag
set_timer0(26473); // 26473.5 offset for 1.0s time in DIV_128
}

at my main routine I add this instructions:

Code:

setup_adc_ports(NO_ANALOGS);
setup_timer_0(RTCC_INTERNAL | RTCC_DIV_128);
enable_interrupts(int_timer0);
enable_interrupts(GLOBAL);

My question is... I am correct with my setup in using timer0 that tic every seconds.

Anybody in the community who can provide me with a basic math calculation if in case I change the clock from 20MHz to 6Mhz.

A generic model would help... thank u

Guest

Re: #int_tmr0 Help

Posted: Fri Dec 19, 2003 8:18 am

ritchie wrote:

Hello,

I'm planning to use the RTC of my PIC18F452 to tic every seconds at 20MHz clock.

I put instructions into my code as stated below:

Code:

#int_timer0
timer0_isr() {
seconds++; // This interrupt occurs every second
ticxf = 1; // set timer flag
set_timer0(26473); // 26473.5 offset for 1.0s time in DIV_128
}

at my main routine I add this instructions:

Code:

setup_adc_ports(NO_ANALOGS);
setup_timer_0(RTCC_INTERNAL | RTCC_DIV_128);
enable_interrupts(int_timer0);
enable_interrupts(GLOBAL);

If you do a search in this forum for RTC you will find some excellent examples of much better solutions than what you plan to use.

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