On Thu, 25 Sep 1997, Gavin Jackson wrote:

> Hi there
>
> I am using a 74A for some async TX/RX and would like
> to know what the best way of configuring BRGH is?
> Either high speed or low speed as I understand that
> there is a bug in one of the settings.
>
> I also wrote some code and ran it in the MPLAB
> ver 3.22.02. The code is for the 74A is as follows:
>
> ORG     00H
> BSF     STATUS,RP0
> CLRF    TRISA
> CLRF    TRISE
> BCF     STATUS,RP0
> BSF     PORTA,0
> BSF     PORTA,1
> BSF     PORTA,4
> BSF     PORTE,0
>         END
>
> Non of these instructions seem to set the bits,
> or that's what the simulator indicates. The only
> bit which sets is Port A bit 4. Is it something to
> do with their alternate functions?

As far as I recall, Pin 4 on Port A is a voltage reference output for the
A/D circuitry.  I don't think you can set it.  Someone else can clarify as
i don't have my data book here.

Rob

>
> Thanks in advance
>
> Gavin
> vulcan@ihug.co.nz
>