www.pudn.com > Music_play.rar > STARTUP.A51, change:2004-03-27,size:5115b


$NOMOD51 
;------------------------------------------------------------------------------ 
;  This file is part of the C51 Compiler package 
;  Copyright (c) 1988-2002 Keil Elektronik GmbH and Keil Software, Inc. 
;------------------------------------------------------------------------------ 
;  STARTUP.A51:  This code is executed after processor reset. 
; 
;  To translate this file use A51 with the following invocation: 
; 
;     A51 STARTUP.A51 
; 
;  To link the modified STARTUP.OBJ file to your application use the following 
;  BL51 invocation: 
; 
;     BL51 <your object file list>, STARTUP.OBJ <controls> 
; 
;------------------------------------------------------------------------------ 
; 
;  User-defined Power-On Initialization of Memory 
; 
;  With the following EQU statements the initialization of memory 
;  at processor reset can be defined: 
; 
;               ; the absolute start-address of IDATA memory is always 0 
IDATALEN        EQU     80H     ; the length of IDATA memory in bytes. 
; 
XDATASTART      EQU     0H      ; the absolute start-address of XDATA memory 
XDATALEN        EQU     0H      ; the length of XDATA memory in bytes. 
; 
PDATASTART      EQU     0H      ; the absolute start-address of PDATA memory 
PDATALEN        EQU     0H      ; the length of PDATA memory in bytes. 
; 
;  Notes:  The IDATA space overlaps physically the DATA and BIT areas of the 
;          8051 CPU. At minimum the memory space occupied from the C51  
;          run-time routines must be set to zero. 
;------------------------------------------------------------------------------ 
; 
;  Reentrant Stack Initilization 
; 
;  The following EQU statements define the stack pointer for reentrant 
;  functions and initialized it: 
; 
;  Stack Space for reentrant functions in the SMALL model. 
IBPSTACK        EQU     0       ; set to 1 if small reentrant is used. 
IBPSTACKTOP     EQU     0FFH+1  ; set top of stack to highest location+1. 
; 
;  Stack Space for reentrant functions in the LARGE model.       
XBPSTACK        EQU     0       ; set to 1 if large reentrant is used. 
XBPSTACKTOP     EQU     0FFFFH+1; set top of stack to highest location+1. 
; 
;  Stack Space for reentrant functions in the COMPACT model.     
PBPSTACK        EQU     0       ; set to 1 if compact reentrant is used. 
PBPSTACKTOP     EQU     0FFFFH+1; set top of stack to highest location+1. 
; 
;------------------------------------------------------------------------------ 
; 
;  Page Definition for Using the Compact Model with 64 KByte xdata RAM 
; 
;  The following EQU statements define the xdata page used for pdata 
;  variables. The EQU PPAGE must conform with the PPAGE control used 
;  in the linker invocation. 
; 
PPAGEENABLE     EQU     0       ; set to 1 if pdata object are used. 
; 
PPAGE           EQU     0       ; define PPAGE number. 
; 
PPAGE_SFR       DATA    0A0H    ; SFR that supplies uppermost address byte 
;               (most 8051 variants use P2 as uppermost address byte) 
; 
;------------------------------------------------------------------------------ 
 
; Standard SFR Symbols  
ACC     DATA    0E0H 
B       DATA    0F0H 
SP      DATA    81H 
DPL     DATA    82H 
DPH     DATA    83H 
 
                NAME    ?C_STARTUP 
 
 
?C_C51STARTUP   SEGMENT   CODE 
?STACK          SEGMENT   IDATA 
 
                RSEG    ?STACK 
                DS      1 
 
                EXTRN CODE (?C_START) 
                PUBLIC  ?C_STARTUP 
 
                CSEG    AT      0 
?C_STARTUP:     LJMP    STARTUP1 
 
                RSEG    ?C_C51STARTUP 
 
STARTUP1: 
 
IF IDATALEN <> 0 
                MOV     R0,#IDATALEN - 1 
                CLR     A 
IDATALOOP:      MOV     @R0,A 
                DJNZ    R0,IDATALOOP 
ENDIF 
 
IF XDATALEN <> 0 
                MOV     DPTR,#XDATASTART 
                MOV     R7,#LOW (XDATALEN) 
  IF (LOW (XDATALEN)) <> 0 
                MOV     R6,#(HIGH (XDATALEN)) +1 
  ELSE 
                MOV     R6,#HIGH (XDATALEN) 
  ENDIF 
                CLR     A 
XDATALOOP:      MOVX    @DPTR,A 
                INC     DPTR 
                DJNZ    R7,XDATALOOP 
                DJNZ    R6,XDATALOOP 
ENDIF 
 
IF PPAGEENABLE <> 0 
                MOV     PPAGE_SFR,#PPAGE 
ENDIF 
 
IF PDATALEN <> 0 
                MOV     R0,#LOW (PDATASTART) 
                MOV     R7,#LOW (PDATALEN) 
                CLR     A 
PDATALOOP:      MOVX    @R0,A 
                INC     R0 
                DJNZ    R7,PDATALOOP 
ENDIF 
 
IF IBPSTACK <> 0 
EXTRN DATA (?C_IBP) 
 
                MOV     ?C_IBP,#LOW IBPSTACKTOP 
ENDIF 
 
IF XBPSTACK <> 0 
EXTRN DATA (?C_XBP) 
 
                MOV     ?C_XBP,#HIGH XBPSTACKTOP 
                MOV     ?C_XBP+1,#LOW XBPSTACKTOP 
ENDIF 
 
IF PBPSTACK <> 0 
EXTRN DATA (?C_PBP) 
                MOV     ?C_PBP,#LOW PBPSTACKTOP 
ENDIF 
 
                MOV     SP,#?STACK-1 
; This code is required if you use L51_BANK.A51 with Banking Mode 4 
; EXTRN CODE (?B_SWITCH0) 
;               CALL    ?B_SWITCH0      ; init bank mechanism to code bank 0 
                LJMP    ?C_START 
 
                END