we present information about computer news and price information and specs samsung, huawei, Tecno Price products, Specifications & Features and more information about software

Minggu, 21 Oktober 2012

How to Set Up a Timer in PIC16F877A

How to Set Up a Timer in PIC16F877A - do you know that every day there are new gadgets that are created with new advantages to simplify your life, on the blog Computers News we will discuss about the latest gadgets and gadgets that have long ranging from speck and price, now we will discuss about How to Set Up a Timer in PIC16F877A we have collected a lot of news to make this article to be really useful for you, please see.

Articles : How to Set Up a Timer in PIC16F877A
full Link : How to Set Up a Timer in PIC16F877A

You can also see our article on:


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





article titled How to Set Up a Timer in PIC16F877A has been completed in the discussion

hopefully information about How to Set Up a Timer in PIC16F877A can provide benefits for you in determining the gadget to suit your needs so much easier in living everyday life.

you just read the article entitled How to Set Up a Timer in PIC16F877A if you feel this information is useful for you and want to bookmark it or want to share it please use link https://nandncomputers.blogspot.com/2012/10/how-to-set-up-timer-in-pic16f877a.html.

Tag :
Share on Facebook
Share on Twitter
Share on Google+
Tags :

Related : How to Set Up a Timer in PIC16F877A

0 komentar:

Posting Komentar