Chris wrote:
>H  E  L  P  !!!!!!!!!!!!!!!!!
>I am having trouble reading the input states on PORTA of a 16F627. I have
>the 627 USART set to TX to a USART RX on an 18C442. The 442 is
>receiving from several devices, selection is controlled by an address bit.
>
>On the 627 I am using an external oscillator and MCLR, and thus can't use
>RA5:7 (not a problem, I have built the word I need from input to Port A &
>Port B bits)
>Comparators have been disabled (CMCON = 0x07)
>Voltage refs have been disabled (VRCON = 0)
>TRISA = 0x1F (RA0:4 as inputs), etc...etc...

In what way doesn't it work? Not transmitting the right values?
Maybe post the code that shows how you construct the byte being sent.

>The 627 Reads the constructed byte on the inputs and sends it to the 442.
>The 18C442 sends the data as a decimal to a serial LCD via the USART TX.

Can you check the serial out of the '627 with a PC to see if it's correct?

>The problem: I can POR the thing repeatedly, and get the correct result on
>the LCD (and presumably in the register also) about 1/2 the time. When the
>LSB is set on the 627's pin, it seems more troublesome.
>
>Both Pica's are running on 5Mhz clocks, the 627 is a 20Mhz chip, and both
>are set for 9600.

Regards...

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