At 09:53 PM 6/10/99 -0400, you wrote:

It is a real pain with the 2 pages. You must set and clear the PCLATH when
moving between pages. You are correct in saying that it must be cleared
before doing the goto START.

good luck,

Peter
>I realize this has come up before, and I thought I understood it - but it is
>not working as I thought it should.
>I am doing development with a 16C74A while waiting on TechTools to come out
>with the 16C87X family module.  To make sure I understood how to make a long
>call (i.e. cross a 2k boundary) I wrote the following test code:
>device  pic16c74A,xt_osc,wdt_off,protect_off
>        org 00
>        goto START
>        org 05h
>START
>        bsf pclath,3
>        call TEST
>        goto START
>        org 090fh
>TEST
>        retlw 0
>
>As I understood, the call would push the entire return address to the stack,
>so the "retlw 0" would return to the "goto START", which it does, however,
>since I set the pclath bit 3 to 1 before the call, it is staying 1 on the
>"retlw 0" and the "goto START" is going to location 1005h rather than 0005h.
>If I put a "bcf pclath,3" before the "retlw 0" then the program does goto
>location 0005h.
>
>I thought the pclath was cleared by the retlw - is it not?
>Thanks,
>
>David V. Fansler
>Network Administrator
>AutoCyte, Inc.
>336-222-9707 Ext. 261
>dfansler@autocyte.com
>Now Showing! www.mindspring.com\~dfansler\  Updated September 23, 1999
>