Last time I ran into this I had forgotten to turn the comparators off - I
don't have a 628 handy, but check the other functions of that chip and make
sure that RB1 isn't tied to another function.

DougM


-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
slippyr4
Sent: Wednesday, March 14, 2007 5:49 AM
To: Microcontroller discussion list - Public.
Subject: Something funny with RB1 on 16F628

Hi All,

Something wierd is going on. More than likely it's just me being
stupid, but i'd appreciate some help nonetheless.

I have a 16F628 (not the ~A). I'm trying to set RB0 and RB1 as
outputs, and high.

		banksel RCSTA  ; turn off USART
		clrf	RCSTA
		banksel	TRISB   ; set all of PORTB to outputs
		clrf	TRISB
		banksel PORTB  ; set all outputs high
		movlw   0b11111111
		movwf	PORTB


when I run that code, RB0 does indeed go high, but RB1 does not. it
stays firmly low. Currently, these pins are tied to ground via 10K; i
am testing high and low with my scope.

Any ideas? am i doing something stoopid?

Thanks

Jon
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