Hello,

I am working on an LCD (HD44780) driver that I can use in future programs.
by more or less pasting it in. I am using 4-bit mode and the E and RS pins,
so it only takes six pins to interface to it. Right now I have the 4 data
lines on the upper 4 bits of PORTB (I'm using a 16F872 but am going to
switch it to an 'F873 soon). I want to put the control lines on the same
port so that it is easier to use the other ports. Would the easiest way to
do this be to read the current PORTB values, IOR them with the 4 data bits
to be sent to the LCD and then stick it back in PORTB? What about putting
the 4 bits in w and then doing IORWF  PORTB,w then move w to PORTB? Is there
a preferred method?

The second part of the question has to do with the USART on the 'F873. I
want to put the LCD lines on the lower part of PORTC while using the 2 upper
pins for serial communication (using the USART). Will the operation of the
USART be affected in either receive or transmit if I read and write to all
of PORTC? If so, what can be done to read and write the rest of PORTC while
using the USART?

Thanks in advance,
Andy N8MX
www.qsl.net/n8mx


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