pic18f4431 timer1 problem

[gehan_s]

Hi all,

I want to use the timer1 of the PIC18f4431 to increment every instruction cycle. I wrote a function to do this and simulated using pic18 simulator IDE but I am not seeing the TMRL register increment. Please take a look at my code and correct me.

void timer1_init(){

     T1CON.RD16    = 0;          // enable register read/write of TIMER1 in two 8-bit operations
     T1CON.T1RUN   = 0;          // system clock is derived from another source
     T1CON.T1CKPS1 = 0;          // ##increments with 1:1 prescale value
     T1CON.T1CKPS0 = 0;          // ##
     T1CON.T1OSCEN = 0;          // TIMER1 oscillator is shut-off
     T1CON.TMR1CS  = 0;          // enable TIMER1
     T1CON.TMR1ON  = 1;          // TIMER1 uses internal clock (FOSC/4)
     TMR1L         = 0;          // clear TIMER1 lower register

}

Regards

 

[Golden Electronics]

ur Timer Initialize correctly. Check other register such as Crystal freq. etc. r u using interrupt if no then use to check for Timer1 operation. If work then it must go to ISR location.

 

[gehan_s]

Hi Golden Electronics and thank you for your reply !!!!!!!!!!!

If I do not initalize the interrupts and the only bit of code that I have is this function, then won't the TMR1 register increment ? I am refering to something like this,

void main(){

T1CON.RD16    = 0;          
     T1CON.T1RUN   = 0;          
     T1CON.T1CKPS1 = 0;          
     T1CON.T1CKPS0 = 0;          
     T1CON.T1OSCEN = 0;         
     T1CON.TMR1CS  = 0;          
     T1CON.TMR1ON  = 1;         
     TMR1L         = 0;        


while(1){

}
}

 

[embpic]

Start timer after assignning values to timer related registers.