Blink Programme for 16F876

[Bruce]

read the Datasheets

And if it still doesn't work -- take a peek at the "errata sheet"....;o]

[Melanie]

And by the time you've done that, you'll discover the part has been obsoleted by the 'A' version!

[banjaxxed]

after spending a fortune, getting no answers or support from my suppliers... only more questions - in getting this thing going...... i'll be obsolete myself before it's over

(should have spent my hundreads of pounds on a decent micro plc)

[Bruce]

Post your code that's not working with a note on your config fuse settings.

[banjaxxed]

<thanks to all for any advice>

After a long hair pulling session, figured out the 16F876 starts with the A/D running. I wanted digital out Pin 22 (RB1). This is turned off by command 'ADCON1=7' line.

Working code below to save someone else fustration:

' Ricky V
' 28 March 2005
' Blink Program
' MCU PIC16F876
' Rev 56,098,345

DEFINE OSC 4

ADCON1=7 'disable analogue to digital converter
TRISB = 0 'set all pins on Port B to outputs
LED VAR PORTB.1 'Sets which PIN the LED is on, Pin 22 +5V

loop:
High LED ' Turn on LED connected to PORTB.1 as Set in VAR LED
Pause 500 ' Delay for .5 seconds
Low LED ' Turn off LED connected to PORTB.1 as Set in VAR LED
Pause 500 ' Delay for .5 seconds
Goto loop ' Go back to loop and blink LED forever

End
=-=-=-=-=-=-=-=-==-=-==-=--=-=-=-=-=-=-==-=-=-=-=-==-

[Bruce]

I'm glad to hear you got it working, but ADCON1 has no affect on PORTB.

PORTA is the 16F876 A/D port.

AN4 = RA5
AN3 = RA3
AN2 = RA2
AN1 = RA1
AN0 = RA0

[4Lewis]

I used your exact code (which I know works just from looking at it) and I get this error "Code Programming error at 0000" - any suggestions, help?

-------------------------------
DEFINE OSC 4

TRISB = 0 'set all pins on Port B to outputs
LED VAR PORTB.1 'Sets which PIN the LED is on, Pin 22 +5V

loop:
High LED ' Turn on LED connected to PORTB.1 as Set in VAR LED
Pause 500 ' Delay for .5 seconds
Low LED ' Turn off LED connected to PORTB.1 as Set in VAR LED
Pause 500 ' Delay for .5 seconds
Goto loop ' Go back to loop and blink LED forever

End
------------------------------