start4xx.a51

Keil uVision2

$NOMOD51
;------------------------------------------------------------------------------
;  This file is part of the C51 Compiler package
;  Copyright (c) 1988-2004 Keil Elektronik GmbH and Keil Software, Inc.
;  Startup code for Dallas DS89C420/430/440/450
;------------------------------------------------------------------------------
;  START4XX.A51:  This code is executed after processor reset.
;  You may add this file to a uVision2 project.
;  *** <<< Use Configuration Wizard in Context Menu >>> ***
;  To translate this file use A51 with the following invocation:
;
;     AX51 START4XX.A51 MOD_CONT
;
;  To link the modified STARTUP.OBJ file to your application use the following
;  LX51 invocation:
;
;     LX51 your object file list, START4XX.OBJ [controls]

;
;------------------------------------------------------------------------------
;
; <h>Chip Specific Options 
;
;  <h>ACON - Page Mode Enable and External Memory Cycle Control
;  <q.7>  PAGEEE: Page Mode Enable (ACON.7)
;      0 => Disable Page Mode
;      1 => Enable Page Mode
;
;  <o.5..6> PAGES: Page Mode Multiplex on Port 2 & Timing Select (ACON.6, ACON.5)
;   <0=> Multiplex address MSB/LSB,  page hit: 1 cycle,  page miss: 2 cycles
;   <1=> Multiplex address MSB/LSB,  page hit: 2 cycles, page miss: 4 cycles
;   <2=> Multiplex address MSB/LSB,  page hit: 4 cycles, page miss: 8 cycles
;   <3=> Multiplex address MSB/data, page hit: 2 cycles, page miss: 4 cycles
ACONVAL EQU 0xA0
;   </h>
;
; <e> PMR - Power Management Register
CLOCKADJUST EQU 1
;   <o> CD: Clock Divide Control (PMR.7, PMR.6, PMR.3)
;           <0x08=> x4 Mode (Crystal multiplier 4)
;           <0x00=> x2 Mode (Crystal multiplier 2)
;           <0x80=> Direct Mode (Crystal = clock, default)
;           <0xC0=> /1024 Mode (Crystal divided by 1024)
_CKMODE  EQU 0x08
;   <q.2>    ALEON: ALE Enable
;   <i> When set this bit enables the ALE signal output during on-chip program
;   <i> and data memory accesses.
;   <o.0..1> DME: Data Memory Enable (PMR.0, PMR.1)
;        <0=> 0000h朏FFFh External Data Memory (default)
;        <1=> 0000h