At 20:30 27.12.1999 -0600, you wrote:
>Hello,
>
>I just started to learn Pic programming.  Can someone comment on my coments
>about this program?
>
>org     0
>
>clrf    PORTB
>bsf     STATUS, RP0

>bcf     TRISB & 0x07f, 0        ; Set bit 0 to output
>Here is where I have trouble.  If I understand this correctly,  this should
>take 00000000 and (and) it
>with 01111111.  Am I right?

What are you trying to do here? Set RB0 as output?
Why do need to and register address to $7f ? No need to my nolidge.
Simply would need only to do
        bcf TRISB,0     to set RB0 as output.

>
>bcf     STATUS, RP0
>Goto    $
>end

>Another thing I want to know is how can you clear PortB if you don't switch
>banks first?  I mean according to Mykes book,  which is where I copied this
>program from, the above code says it is ok to clear PortB, but to set the
>I/O direction, you need to switch banks first.

Thats true.

You can always clear portb and porta whitout changing bank. Direction
registers how ever are loccated in bank 1 and there fore need to change
bank when need to change directions.

J.M. Vehasmaa
Name: Jurva-Markus Vehasmaa
Email: vehasmaa@dlc.fi
Homepage: http://www.saunalahti.fi/vehasmaa/
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