Hi All,
I'm not totally new to pics but before had been programming PIC18f series in
C.. so I'm not that apt at figuring out assembly yet, especially bank
select. Anyway, I'm unable to get any of my pins to output anything... I'm
trying to eventually drive a 7 segment LED character display(common anode)
and am able to manually do it by connecting the appropriate pins to
ground... however can't get it to work with the PIC. I have 0 volts on every
line of the pic(except VDD), and if I hook up any of them to the LED lines
that are supposed to sink to the pic if set to 0, do nothing if set to 5,
then the pic lines jump up to 5 volts.  Anyway, I must be coding it wrong.
It's short code so far as I've done little but to check if I'm getting the
right voltages, which I'm not...



;**********************************************************************
;   This file is a basic code template for object module code         *
;   generation on the PICmicro PIC16F684. This file contains the      *
;   basic code building blocks to build upon.  As a project minimum   *
;   the 16F684.lkr file will also be required for this file to        *
;   correctly build. The .lkr files are located in the MPLAB          *
;   directory.                                                        *
;                                                                     *
;   If interrupts are not used all code presented between the         *
;   code section "INT_VECTOR and code section "MAIN" can be removed.  *
;   In addition the variable assignments for 'w_temp' and             *
;   'status_temp' can be removed.                                     *
;                                                                     *
;   If interrupts are used, as in this template file, the 16F684.lkr  *
;   file will need to be modified as follows: Remove the lines        *
;     CODEPAGE   NAME=vectors  START=0x0      END=0x4      PROTECTED  *
;   and                                                               *
;     SECTION    NAME=STARTUP  ROM=vectors                            *
;   and change the start address of the page0 section from 0x5 to 0x0 *
;                                                                     *
;   Refer to the MPASM User's Guide for additional information on     *
;   features of the assembler and linker (Document DS33014).          *
;                                                                     *
;   Refer to the respective PICmicro data sheet for additional        *
;   information on the instruction set.                               *
;                                                                     *



    list      p=16F684               ; list directive to define processor
    #include <p16F684.inc>            ; processor specific variable
definitions

    errorlevel  -302                  ; suppress message 302 from list file

; '__CONFIG' directive is used to embed configuration word within .asm file.
; The lables following the directive are located in the respective .inc
file.
; See data sheet for additional information on configuration word settings.
    __CONFIG   _CP_OFF & _CPD_OFF & _BOD_OFF & _MCLRE_ON & _WDT_OFF &
_INTRC_OSC_NOCLKOUT & _FCMEN_ON

BANK1    MACRO
    BSF        STATUS, RP0            ;MACRO TO SELECT BANK 1
    ENDM

BANK0    MACRO
    BCF        STATUS, RP0            ;MACRO TO SELECT BANK 0
    ENDM


;***** VARIABLE DEFINITIONS (examples)

; example of using Shared Uninitialized Data Section
INT_VAR        UDATA_SHR    0x71
w_temp        RES     1        ; variable used for context saving
status_temp    RES     1        ; variable used for context saving


;**********************************************************************
RESET_VECTOR    CODE    0x000        ; processor reset vector
        goto    main            ; go to beginning of program


INT_VECTOR    CODE    0x004        ; interrupt vector location
        movwf   w_temp          ; save off current W register contents
        movf    STATUS,w        ; move status register into W register
        movwf    status_temp     ; save off contents of STATUS register

; isr code can go here or be located as a call subroutine elsewhere


        movf    status_temp,W   ; retrieve copy of STATUS register
        movwf    STATUS          ; restore pre-isr STATUS register contents
        swapf   w_temp,F
        swapf   w_temp,W        ; restore pre-isr W register contents
        retfie                  ; return from interrupt


main
; remaining code goes here
    banksel INTCON
    BCF INTCON, 7
    banksel PORTA
    CLRF PORTA
    banksel CMCON0
    MOVLW 07h
    MOVWF CMCON0
    banksel ANSEL
    CLRF ANSEL
    banksel TRISA
    CLRF TRISA
    banksel IOCA
    CLRF IOCA
    banksel PORTA
    MOVLW b'01111111'
    MOVWF PORTA
loop goto loop
; initialize eeprom locations

EE        CODE    0x2100
        DE    0x00, 0x01, 0x02, 0x03


        END                       ; directive 'end of program'
-- 
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