Configuration setting problem of pic16f676

[Noman Yousaf]

HI
i m new in PIC
i m making a simple up counter using PIC16F676.
software is working. mplab's debugger shows that.
but i have some problem while configuring configure bits.
i want :
1. internal oscillator of 4MHZ.
2. RA3 as I/O port.

i configured as follows



doesnt matter watchdog timer is enabled or disabled.

 

[kgavionics]

hi
are you using assembler or c?
if you use assembler you can include this header in your asm file

list		p=16f676	; list directive to define processor
	#include	<p16f676.inc>	; processor specific variable definitions
	
	__CONFIG _CP_OFF & _WDT_OFF & _BODEN_OFF & _PWRTE_ON & _XT_OSC & _WRT_OFF & _LVP_OFF & _CPD_OFF

hope it helps

 

[Noman Yousaf]

1: what does mean by LVP?
2: Is this configured for internal oscillator or external? i think it is for external oscillator. u wrote "_XT_OSC"

 

[kgavionics]

hi
Lvp is "Low voltage programming" it's an option for programming the ucontroller using low voltage.
_XT_OSC: external crystal oscillator, with this config you can use up to 4 MHZ, if you are planing to use more than that frequency, you must use _HS_OSC ruther than _XT_OSC.

for internal oscillator you must use this code

list		p=16f676				; list directive to define processor
	#include	<P16F676.inc>		; processor specific variable definitions
	
	__CONFIG    _CONFIG1,  _CP_OFF & _CCP2_RC1 & _DEBUG_OFF & _VBOR_2_0 & _BOREN_0 & _MCLR_ON & _PWRTE_ON & _WDT_OFF & _INTRC_IO
	__CONFIG    _CONFIG2,  _BORSEN_0 & _IESO_OFF & _FCMEN_OFF