📄 startup.lst
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A51 MACRO ASSEMBLER STARTUP 03/23/2004 10:04:45 PAGE 1
MACRO ASSEMBLER A51 V7.08a
OBJECT MODULE PLACED IN STARTUP.OBJ
ASSEMBLER INVOKED BY: C:\KEIL\C51\BIN\A51.EXE STARTUP.A51 SET(SMALL,MONITOR51) DEBUG XREF EP
LOC OBJ LINE SOURCE
1 $nomod51
2 ;------------------------------------------------------------------------------
3 ; This file is part of the C51 Compiler package
4 ; Copyright (c) 1988-2002 Keil Elektronik GmbH and Keil Software, Inc.
5 ;------------------------------------------------------------------------------
6 ; STARTUP.A51: This code is executed after processor reset.
7 ;
8 ; To translate this file use A51 with the following invocation:
9 ;
10 ; A51 STARTUP.A51
11 ;
12 ; To link the modified STARTUP.OBJ file to your application use the following
13 ; BL51 invocation:
14 ;
15 ; BL51 <your object file list>, STARTUP.OBJ <controls>
16 ;
17 ;------------------------------------------------------------------------------
18 ;
19 ; User-defined Power-On Initialization of Memory
20 ;
21 ; With the following EQU statements the initialization of memory
22 ; at processor reset can be defined:
23 ;
24 ; ; the absolute start-address of IDATA memory is always 0
0080 25 IDATALEN EQU 80H ; the length of IDATA memory in bytes.
26 ;
0000 27 XDATASTART EQU 0H ; the absolute start-address of XDATA memory
0000 28 XDATALEN EQU 0H ; the length of XDATA memory in bytes.
29 ;
0000 30 PDATASTART EQU 0H ; the absolute start-address of PDATA memory
0000 31 PDATALEN EQU 0H ; the length of PDATA memory in bytes.
32 ;
33 ; Notes: The IDATA space overlaps physically the DATA and BIT areas of the
34 ; 8051 CPU. At minimum the memory space occupied from the C51
35 ; run-time routines must be set to zero.
36 ;------------------------------------------------------------------------------
37 ;
38 ; Reentrant Stack Initilization
39 ;
40 ; The following EQU statements define the stack pointer for reentrant
41 ; functions and initialized it:
42 ;
43 ; Stack Space for reentrant functions in the SMALL model.
0000 44 IBPSTACK EQU 0 ; set to 1 if small reentrant is used.
0100 45 IBPSTACKTOP EQU 0FFH+1 ; set top of stack to highest location+1.
46 ;
47 ; Stack Space for reentrant functions in the LARGE model.
0000 48 XBPSTACK EQU 0 ; set to 1 if large reentrant is used.
0000 49 XBPSTACKTOP EQU 0FFFFH+1; set top of stack to highest location+1.
50 ;
51 ; Stack Space for reentrant functions in the COMPACT model.
0000 52 PBPSTACK EQU 0 ; set to 1 if compact reentrant is used.
0000 53 PBPSTACKTOP EQU 0FFFFH+1; set top of stack to highest location+1.
54 ;
55 ;------------------------------------------------------------------------------
56 ;
57 ; Page Definition for Using the Compact Model with 64 KByte xdata RAM
58 ;
A51 MACRO ASSEMBLER STARTUP 03/23/2004 10:04:45 PAGE 2
59 ; The following EQU statements define the xdata page used for pdata
60 ; variables. The EQU PPAGE must conform with the PPAGE control used
61 ; in the linker invocation.
62 ;
0000 63 PPAGEENABLE EQU 0 ; set to 1 if pdata object are used.
64 ;
0000 65 PPAGE EQU 0 ; define PPAGE number.
66 ;
00A0 67 PPAGE_SFR DATA 0A0H ; SFR that supplies uppermost address byte
68 ; (most 8051 variants use P2 as uppermost address byte)
69 ;
70 ;------------------------------------------------------------------------------
71
72 ; Standard SFR Symbols
00E0 73 ACC DATA 0E0H
00F0 74 B DATA 0F0H
0081 75 SP DATA 81H
0082 76 DPL DATA 82H
0083 77 DPH DATA 83H
78
79 NAME ?C_STARTUP
80
81 ?C_C51STARTUP SEGMENT CODE
82 ?STACK SEGMENT IDATA
83
---- 84 RSEG ?STACK
0000 85 DS 1
86
87 EXTRN CODE (?C_START)
88 PUBLIC ?C_STARTUP
89
---- 90 CSEG AT 0X8000
8000 020000 F 91 ?C_STARTUP: LJMP STARTUP1
92
---- 93 RSEG ?C_C51STARTUP
94
0000 95 STARTUP1:
96
97 IF IDATALEN <> 0
0000 787F 98 MOV R0,#IDATALEN - 1
0002 E4 99 CLR A
0003 F6 100 IDATALOOP: MOV @R0,A
0004 D8FD 101 DJNZ R0,IDATALOOP
102 ENDIF
103
104 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
118
119 IF PPAGEENABLE <> 0
MOV PPAGE_SFR,#PPAGE
ENDIF
122
123 IF PDATALEN <> 0
MOV R0,#LOW (PDATASTART)
A51 MACRO ASSEMBLER STARTUP 03/23/2004 10:04:45 PAGE 3
MOV R7,#LOW (PDATALEN)
CLR A
PDATALOOP: MOVX @R0,A
INC R0
DJNZ R7,PDATALOOP
ENDIF
131
132 IF IBPSTACK <> 0
EXTRN DATA (?C_IBP)
MOV ?C_IBP,#LOW IBPSTACKTOP
ENDIF
137
138 IF XBPSTACK <> 0
EXTRN DATA (?C_XBP)
MOV ?C_XBP,#HIGH XBPSTACKTOP
MOV ?C_XBP+1,#LOW XBPSTACKTOP
ENDIF
144
145 IF PBPSTACK <> 0
EXTRN DATA (?C_PBP)
MOV ?C_PBP,#LOW PBPSTACKTOP
ENDIF
149
0006 758100 F 150 MOV SP,#?STACK-1
151 ; This code is required if you use L51_BANK.A51 with Banking Mode 4
152 ; EXTRN CODE (?B_SWITCH0)
153 ; CALL ?B_SWITCH0 ; init bank mechanism to code bank 0
0009 020000 F 154 LJMP ?C_START
155
156 END
A51 MACRO ASSEMBLER STARTUP 03/23/2004 10:04:45 PAGE 4
XREF SYMBOL TABLE LISTING
---- ------ ----- -------
N A M E T Y P E V A L U E ATTRIBUTES / REFERENCES
?C_C51STARTUP. . . C SEG 000CH REL=UNIT 81# 93
?C_START . . . . . C ADDR ----- EXT 87# 154
?C_STARTUP . . . . C ADDR 8000H A 79 88 91#
?STACK . . . . . . I SEG 0001H REL=UNIT 82# 84 150
ACC. . . . . . . . D ADDR 00E0H A 73#
B. . . . . . . . . D ADDR 00F0H A 74#
DPH. . . . . . . . D ADDR 0083H A 77#
DPL. . . . . . . . D ADDR 0082H A 76#
IBPSTACK . . . . . N NUMB 0000H A 44# 132
IBPSTACKTOP. . . . N NUMB 0100H A 45#
IDATALEN . . . . . N NUMB 0080H A 25# 97 98
IDATALOOP. . . . . C ADDR 0003H R SEG=?C_C51STARTUP 100# 101
PBPSTACK . . . . . N NUMB 0000H A 52# 145
PBPSTACKTOP. . . . N NUMB 0000H A 53#
PDATALEN . . . . . N NUMB 0000H A 31# 123
PDATASTART . . . . N NUMB 0000H A 30#
PPAGE. . . . . . . N NUMB 0000H A 65#
PPAGEENABLE. . . . N NUMB 0000H A 63# 119
PPAGE_SFR. . . . . D ADDR 00A0H A 67#
SP . . . . . . . . D ADDR 0081H A 75# 150
STARTUP1 . . . . . C ADDR 0000H R SEG=?C_C51STARTUP 91 95#
XBPSTACK . . . . . N NUMB 0000H A 48# 138
XBPSTACKTOP. . . . N NUMB 0000H A 49#
XDATALEN . . . . . N NUMB 0000H A 28# 104 107
XDATASTART . . . . N NUMB 0000H A 27#
REGISTER BANK(S) USED: 0
ASSEMBLY COMPLETE. 0 WARNING(S), 0 ERROR(S)
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