Pic16f877

[abood]

I am using PIC16f877A for the first time. I tried a simple program to light two led in portb which is working for PIC16f84A (with 4 MHz crystal), but it doesn't work for 16f877A (with 20 MHz) ………what's wrong ?

This is the program

'40 MHz OSC
TRISB=0
START:
PORTB.0=1
PAUSE 1000
PORTB.0=0
PAUSE 1000
PORTB.1=1
PAUSE 1000
PORTB.1=0
PAUSE 1000
GOTO START

[mister_e]

at least there's a missing DEFINE OSC 20 line but it's suppose to work anyway... but faster than you expect. I suspect a bad config fuse setting and/or bad hardware
http://www.picbasic.co.uk/forum/showthread.php?t=543

[razman]

i am using 16f877a, Please help me to make a program (C or Asm never mind) for my project:

- port a0 as a input from LM34 sensor (small voltage output where 10mV/degree Farrenhiet- i want use 0.95V to activate port a0)
-port a1 as input from mini switch
-port c0 as a output to relay circuit.

The senario is if any input high, output (to relay and fan) will be on.

Hopely u all can help me, please.. thanks.

ps; i am blur to use adc

[keithdoxey]

i am using 16f877a, Please help me to make a program (C or Asm never mind) for my project:

Sorry to disappoint but you will notice that the name of this forum is

MELabs PICBASIC

whilst some snippets of ASM are used from time to time I think you will find a distinct lack of "C".

We are a freindly bunch here so if you would like some help in writing your program in PICBASIC than I am sure you will get some useful tips.

(I was going to say "pointers" but we dont do "C" )

[razman]

Is it PIC16F877a about different with picbasic forums willing...

[razman]

my problems is to use adc (analog input from LM34) in 16f877a.