Al Williams: since elektroda is down...

Archiver

Hi Al,
I'm having some problems with a 16F84A @20Mhz XTAL. I
suspect it's a RMW problem, however I can't 'see' the
solution. I have a pullup with a switch to Gnd on RA2.
I want to sink PORTB when the switch is thrown. On pin
RA2 i can see that i have 5v/0v when the switch is
thrown, however the program just sits in the 'loop'. I
have tried shadowed input, but that didnt help. I hit
a wall...maybe you can help
CLRF STATUS
CLRF PORTB
CLRF PORTA
BSF STATUS, RP0
MOVLW 0xFF
MOVWF TRISB
MOVLW 0x02
MOVWF TRISA
BCF STATUS, RP0
loop
BTFSC PORTA, 2
GOTO loop

loop2
MOVLW 0xFF
MOVWF PORTB
GOTO loop2

Thanks, Radu

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Archiver

sorry LOOP2 should be
> loop2
> MOVLW 0x00
> MOVWF PORTB
> GOTO loop2
>


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Archiver

Is the 16F84A a new Stamp I'm not aware of? From your description it sounds
like a PEBKAC error.

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> I'm having some problems with a 16F84A @20Mhz XTAL.