16F877A with 20MHz XTAL not working?

[izzyblackout]

you will have to edit your 16F877A.inc file as below.

NOLIST
ifdef PM_USED
LIST
include 'M16F87xA.INC' ; PM header
device pic16F877A, HS_osc, wdt_OFF, lvp_off, protect_ON , CP_ON
XALL
NOLIST
else
LIST
LIST p = 16F877A, r = dec, w = -302
INCLUDE "P16F877A.INC" ; MPASM Header
__config _HS_OSC & _WDT_OFF & _LVP_OFF & _CP_OFF
NOLIST
endif
LIST

Your 16F877A will work on 20Mhz.

thx, this one works.