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STARTUP.A51
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198
STARTUP.A51
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$NOMOD51
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;------------------------------------------------------------------------------
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; This file is part of the C51 Compiler package
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; Copyright (c) 1988-2005 Keil Elektronik GmbH and Keil Software, Inc.
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; Version 8.01
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;
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; *** <<< Use Configuration Wizard in Context Menu >>> ***
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;------------------------------------------------------------------------------
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; STARTUP.A51: This code is executed after processor reset.
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;
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; To translate this file use A51 with the following invocation:
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;
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; A51 STARTUP.A51
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;
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; To link the modified STARTUP.OBJ file to your application use the following
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; Lx51 invocation:
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;
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; Lx51 your object file list, STARTUP.OBJ controls
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;
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;------------------------------------------------------------------------------
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;
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; User-defined <h> Power-On Initialization of Memory
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;
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; With the following EQU statements the initialization of memory
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; at processor reset can be defined:
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;
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; <o> IDATALEN: IDATA memory size <0x0-0x100>
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; <i> Note: The absolute start-address of IDATA memory is always 0
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; <i> The IDATA space overlaps physically the DATA and BIT areas.
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IDATALEN EQU 80H
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;
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; <o> XDATASTART: XDATA memory start address <0x0-0xFFFF>
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; <i> The absolute start address of XDATA memory
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XDATASTART EQU 0
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;
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; <o> XDATALEN: XDATA memory size <0x0-0xFFFF>
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; <i> The length of XDATA memory in bytes.
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XDATALEN EQU 0
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;
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; <o> PDATASTART: PDATA memory start address <0x0-0xFFFF>
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; <i> The absolute start address of PDATA memory
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PDATASTART EQU 0H
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;
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; <o> PDATALEN: PDATA memory size <0x0-0xFF>
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; <i> The length of PDATA memory in bytes.
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PDATALEN EQU 0H
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;
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;</h>
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;------------------------------------------------------------------------------
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;
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;<h> Reentrant Stack Initialization
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;
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; The following EQU statements define the stack pointer for reentrant
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; functions and initialized it:
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;
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; <h> Stack Space for reentrant functions in the SMALL model.
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; <q> IBPSTACK: Enable SMALL model reentrant stack
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; <i> Stack space for reentrant functions in the SMALL model.
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IBPSTACK EQU 0 ; set to 1 if small reentrant is used.
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; <o> IBPSTACKTOP: End address of SMALL model stack <0x0-0xFF>
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; <i> Set the top of the stack to the highest location.
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IBPSTACKTOP EQU 0xFF +1 ; default 0FFH+1
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; </h>
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;
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; <h> Stack Space for reentrant functions in the LARGE model.
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; <q> XBPSTACK: Enable LARGE model reentrant stack
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; <i> Stack space for reentrant functions in the LARGE model.
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XBPSTACK EQU 0 ; set to 1 if large reentrant is used.
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; <o> XBPSTACKTOP: End address of LARGE model stack <0x0-0xFFFF>
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; <i> Set the top of the stack to the highest location.
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XBPSTACKTOP EQU 0xFFFF +1 ; default 0FFFFH+1
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; </h>
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;
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; <h> Stack Space for reentrant functions in the COMPACT model.
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; <q> PBPSTACK: Enable COMPACT model reentrant stack
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; <i> Stack space for reentrant functions in the COMPACT model.
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PBPSTACK EQU 0 ; set to 1 if compact reentrant is used.
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;
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; <o> PBPSTACKTOP: End address of COMPACT model stack <0x0-0xFFFF>
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; <i> Set the top of the stack to the highest location.
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PBPSTACKTOP EQU 0xFF +1 ; default 0FFH+1
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; </h>
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;</h>
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;------------------------------------------------------------------------------
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;
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; Memory Page for Using the Compact Model with 64 KByte xdata RAM
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; <e>Compact Model Page Definition
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;
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; <i>Define the XDATA page used for PDATA variables.
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; <i>PPAGE must conform with the PPAGE set in the linker invocation.
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;
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; Enable pdata memory page initalization
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PPAGEENABLE EQU 0 ; set to 1 if pdata object are used.
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;
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; <o> PPAGE number <0x0-0xFF>
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; <i> uppermost 256-byte address of the page used for PDATA variables.
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PPAGE EQU 0
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;
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; <o> SFR address which supplies uppermost address byte <0x0-0xFF>
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; <i> most 8051 variants use P2 as uppermost address byte
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PPAGE_SFR DATA 0A0H
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;
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; </e>
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;------------------------------------------------------------------------------
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; Standard SFR Symbols
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ACC DATA 0E0H
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B DATA 0F0H
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SP DATA 81H
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DPL DATA 82H
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DPH DATA 83H
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NAME ?C_STARTUP
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?C_C51STARTUP SEGMENT CODE
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?STACK SEGMENT IDATA
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RSEG ?STACK
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DS 1
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EXTRN CODE (?C_START)
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PUBLIC ?C_STARTUP
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CSEG AT 0
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?C_STARTUP: LJMP STARTUP1
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RSEG ?C_C51STARTUP
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STARTUP1:
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IF IDATALEN <> 0
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MOV R0,#IDATALEN - 1
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CLR A
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IDATALOOP: MOV @R0,A
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DJNZ R0,IDATALOOP
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ENDIF
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IF XDATALEN <> 0
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MOV DPTR,#XDATASTART
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MOV R7,#LOW (XDATALEN)
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IF (LOW (XDATALEN)) <> 0
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MOV R6,#(HIGH (XDATALEN)) +1
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ELSE
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MOV R6,#HIGH (XDATALEN)
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ENDIF
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CLR A
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XDATALOOP: MOVX @DPTR,A
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INC DPTR
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DJNZ R7,XDATALOOP
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DJNZ R6,XDATALOOP
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ENDIF
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IF PPAGEENABLE <> 0
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MOV PPAGE_SFR,#PPAGE
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ENDIF
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IF PDATALEN <> 0
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MOV R0,#LOW (PDATASTART)
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MOV R7,#LOW (PDATALEN)
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CLR A
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PDATALOOP: MOVX @R0,A
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INC R0
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DJNZ R7,PDATALOOP
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ENDIF
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IF IBPSTACK <> 0
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EXTRN DATA (?C_IBP)
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MOV ?C_IBP,#LOW IBPSTACKTOP
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ENDIF
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IF XBPSTACK <> 0
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EXTRN DATA (?C_XBP)
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MOV ?C_XBP,#HIGH XBPSTACKTOP
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MOV ?C_XBP+1,#LOW XBPSTACKTOP
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ENDIF
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IF PBPSTACK <> 0
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EXTRN DATA (?C_PBP)
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MOV ?C_PBP,#LOW PBPSTACKTOP
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ENDIF
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MOV SP,#?STACK-1
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; This code is required if you use L51_BANK.A51 with Banking Mode 4
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;<h> Code Banking
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; <q> Select Bank 0 for L51_BANK.A51 Mode 4
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#if 0
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; <i> Initialize bank mechanism to code bank 0 when using L51_BANK.A51 with Banking Mode 4.
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EXTRN CODE (?B_SWITCH0)
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CALL ?B_SWITCH0 ; init bank mechanism to code bank 0
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#endif
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;</h>
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LJMP ?C_START
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END
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