0x2007 x 2 == 0x400E

The addresses in the hex file are byte addresses.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

----- Original Message -----
From: "Brandon Fosdick" <bfoz@GLUE.UMD.EDU>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Saturday, June 30, 2001 11:48 PM
Subject: [PIC]:HEX file question


> I'm sure this is a stupid question, but I can't find the answer.
>
> I'm trying to decipher the hex file format (so the unix pocket software
> can load it). The configuration word is giving me problems.
>
> Compiling this asm file... (with either mpasm or gpasm)
>
> ;; test.asm
>         radix   hex
>         list    p=PIC16F877
>         include "p16f877.inc"
>         __CONFIG _HS_OSC & _CP_OFF & _WDT_OFF
>
>         org 0x0
> ; Initialize PORTA, Digital Input<0:7>(Default)
>         bsf     STATUS, RP0     ; Select Bank 1
>         movlw   0x06            ; Configure all pins
>         movwf   ADCON1          ; as digital inputs
>         movlw   0x01            ; 0:input, 1-7:output
>         movwf   TRISA
> ; Initialize PORTB: Digital Inputs<0:7>(Default), No Pullups(Default)
>         ; Power-up defaults
>         movlw   0x0
>         movwf   TRISB
> ; Initialize PORTC: Digital Inputs<0:5>, USART<6,7>
>         ; Set PORTC pin directions
>         bcf     TRISC, 6        ;<0:5,7> Input, <6> Output
>         ; Initialize the USART
> ;       movlw   CALC_HIGH_BAUD(9600)    ;9600bps when BRHG=1
>         movlw   0x81
>         movwf   SPBRG
>         bsf     TXSTA, TXEN     ; Enable transmit
>         bsf     TXSTA, BRGH     ; High baud rate
>         bcf     STATUS, RP0     ; Bank 0
>         bsf     RCSTA, SPEN     ; Enable the serial port
> main
>         movlw   b'11110000'
>         movwf   PORTB
>         goto main
>         end
>
> produces this hex file...
>
> :10000000831606309F0001308500003086000713FC
> :10001000813099009816181583129817F0308600D1
> :020020000E28A8
> :02400E00FA3F77
> :00000001FF
>
> The line in question being...
>
> :02400E00FA3F77
>
> ...which as far as I can tell says to put 0x3FFA at address 0x400E.
> 0x3FFA is the configuration word for this file and all the other lines
> reference space in program memory, so I'm fairly certain this line is
> talking about the config word. Looking at the 16F87X datasheet
> (DS30292B) tells me that the config word is at 0x2007. Now I know that
> the 0x2000 space wraps at 0x3FFF so 0x400E is effectively 0x200E, but
> thats still not the right address. What am I missing?
>
> --
> http://www.piclist.com hint: PICList Posts must start with ONE topic:
> [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads
>
>

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads