www.pudn.com > SHT11.rar > STARTUP.A51, change:2005-03-22,size:6376b


$NOMOD51 
;------------------------------------------------------------------------------ 
;  This file is part of the C51 Compiler package 
;  Copyright (c) 1988-2005 Keil Elektronik GmbH and Keil Software, Inc. 
;  Version 8.01 
; 
;  *** <<< Use Configuration Wizard in Context Menu >>> *** 
;------------------------------------------------------------------------------ 
;  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 
;  Lx51 invocation: 
; 
;     Lx51 your object file list, STARTUP.OBJ  controls 
; 
;------------------------------------------------------------------------------ 
; 
;  User-defined <h> Power-On Initialization of Memory 
; 
;  With the following EQU statements the initialization of memory 
;  at processor reset can be defined: 
; 
; <o> IDATALEN: IDATA memory size <0x0-0x100> 
;     <i> Note: The absolute start-address of IDATA memory is always 0 
;     <i>       The IDATA space overlaps physically the DATA and BIT areas. 
IDATALEN        EQU     80H 
; 
; <o> XDATASTART: XDATA memory start address <0x0-0xFFFF>  
;     <i> The absolute start address of XDATA memory 
XDATASTART      EQU     0      
; 
; <o> XDATALEN: XDATA memory size <0x0-0xFFFF>  
;     <i> The length of XDATA memory in bytes. 
XDATALEN        EQU     0       
; 
; <o> PDATASTART: PDATA memory start address <0x0-0xFFFF>  
;     <i> The absolute start address of PDATA memory 
PDATASTART      EQU     0H 
; 
; <o> PDATALEN: PDATA memory size <0x0-0xFF>  
;     <i> The length of PDATA memory in bytes. 
PDATALEN        EQU     0H 
; 
;</h> 
;------------------------------------------------------------------------------ 
; 
;<h> Reentrant Stack Initialization 
; 
;  The following EQU statements define the stack pointer for reentrant 
;  functions and initialized it: 
; 
; <h> Stack Space for reentrant functions in the SMALL model. 
;  <q> IBPSTACK: Enable SMALL model reentrant stack 
;     <i> Stack space for reentrant functions in the SMALL model. 
IBPSTACK        EQU     0       ; set to 1 if small reentrant is used. 
;  <o> IBPSTACKTOP: End address of SMALL model stack <0x0-0xFF> 
;     <i> Set the top of the stack to the highest location. 
IBPSTACKTOP     EQU     0xFF +1     ; default 0FFH+1   
; </h> 
; 
; <h> Stack Space for reentrant functions in the LARGE model.       
;  <q> XBPSTACK: Enable LARGE model reentrant stack 
;     <i> Stack space for reentrant functions in the LARGE model. 
XBPSTACK        EQU     0       ; set to 1 if large reentrant is used. 
;  <o> XBPSTACKTOP: End address of LARGE model stack <0x0-0xFFFF> 
;     <i> Set the top of the stack to the highest location. 
XBPSTACKTOP     EQU     0xFFFF +1   ; default 0FFFFH+1  
; </h> 
; 
; <h> Stack Space for reentrant functions in the COMPACT model.     
;  <q> PBPSTACK: Enable COMPACT model reentrant stack 
;     <i> Stack space for reentrant functions in the COMPACT model. 
PBPSTACK        EQU     0       ; set to 1 if compact reentrant is used. 
; 
;   <o> PBPSTACKTOP: End address of COMPACT model stack <0x0-0xFFFF> 
;     <i> Set the top of the stack to the highest location. 
PBPSTACKTOP     EQU     0xFF +1     ; default 0FFH+1   
; </h> 
;</h> 
;------------------------------------------------------------------------------ 
; 
;  Memory Page for Using the Compact Model with 64 KByte xdata RAM 
;  <e>Compact Model Page Definition 
; 
;  <i>Define the XDATA page used for PDATA variables.  
;  <i>PPAGE must conform with the PPAGE set in the linker invocation. 
; 
; Enable pdata memory page initalization 
PPAGEENABLE     EQU     0       ; set to 1 if pdata object are used. 
; 
; <o> PPAGE number <0x0-0xFF>  
; <i> uppermost 256-byte address of the page used for PDATA variables. 
PPAGE           EQU     0 
; 
; <o> SFR address which supplies uppermost address byte <0x0-0xFF>  
; <i> most 8051 variants use P2 as uppermost address byte 
PPAGE_SFR       DATA    0A0H 
; 
; </e> 
;------------------------------------------------------------------------------ 
 
; 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 
;<h> Code Banking 
; <q> Select Bank 0 for L51_BANK.A51 Mode 4 
#if 0    
;     <i> Initialize bank mechanism to code bank 0 when using L51_BANK.A51 with Banking Mode 4. 
EXTRN CODE (?B_SWITCH0) 
                CALL    ?B_SWITCH0      ; init bank mechanism to code bank 0 
#endif 
;</h> 
                LJMP    ?C_START 
 
                END