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Minggu, 21 Oktober 2012

How to Set Up a Timer in PIC16F877A

How to Set Up a Timer in PIC16F877A - welcome to the blog Software Gadget the end of this much calm product information launcing, yes every day there are always products that are removed from various brands, both physical hardware products and software that need new knowledge to use it, well now we will discuss first about How to Set Up a Timer in PIC16F877A as you search we have collected a lot of data to make this information as complete as possible for you, please read:

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How to Set Up a Timer in PIC16F877A



We have Three Timers in PIC16F877A , and here we have a look to how to setup the TIMER0 in PIC16F877A using HiTech C programm 




• To set up the timer, one must first disable interrupts so that an interrupt doesn’t occur when the timer expires.
• Then, enable the timer and assign the prescaler to the timer.
• Establish the prescaler value, and finally, load the timer register.
 Whenever the timer expires, the T0IF bit in the INTCON register will be set.
• We must clear this bit, reload the timer register, and then execute the code that is to be done at this time.

In code, the setup portion might look something like:
########################## IN ASSEMBLY PROGRAM ###########################
banksel INTCON
bcf INTCON,T0IE ; Mask timer interrupt
banksel OPTION_REG
bcf OPTION_REG,T0CS ; Enable timer
bcf OPTION_REG,PSA ; Prescaler to timer
bcf OPTION_REG,PS2 ; \
bsf OPTION_REG,PS1 ; >- 1:16 prescale
bsf OPTION_REG,PS0 ; /
movlw D’100’ ; Timer will count
movwf TMR0 ; 156 (256-100) counts

######################## IN HITECH C PROGRAM #######################################
OPTION_REG= 0x0F;
  TMR0=0x0F;
  while(TMR0IF=0);
  TMR0IF=0;
##################################################

• Clearly, the individual bits in the option register could all be set with a single store.
• If we didn’t care about the RB0 interrupt, the weak pullups, or the transition of RA4, then instead of five bit manipulations we could have said:
• movlw B’10000011’ ; Set up prescaler and
• movwf OPTION_REG ; timer

The execution loop might look something like:



main:
    btfss INTCON,T0IF ; Did timer overflow?
    goto main ; No, hang around some more 
    movlw D’100’ ; Timer will count
    movwf TMR0 ; 156 (256-100) counts
    bcf INTCON,T0IF ; reset overflow flag
    call DoCode ; Execute main code
    goto main ; Go back and wait





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