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A51 MACRO ASSEMBLER STARTUP 06/03/2021 22:01:20 PAGE 1
MACRO ASSEMBLER A51 V8.02b
OBJECT MODULE PLACED IN STARTUP.OBJ
ASSEMBLER INVOKED BY: C:\Users\starkchen\Keil4\C51\BIN\A51.EXE STARTUP.A51 SET(SMALL) DEBUG EP
LOC OBJ LINE SOURCE
1 $nomod51
2 ;------------------------------------------------------------------------------
3 ; This file is part of the C51 Compiler package
4 ; Copyright (c) 1988-2005 Keil Elektronik GmbH and Keil Software, Inc.
5 ; Version 8.01
6 ;
7 ; *** <<< Use Configuration Wizard in Context Menu >>> ***
8 ;------------------------------------------------------------------------------
9 ; STARTUP.A51: This code is executed after processor reset.
10 ;
11 ; To translate this file use A51 with the following invocation:
12 ;
13 ; A51 STARTUP.A51
14 ;
15 ; To link the modified STARTUP.OBJ file to your application use the following
16 ; Lx51 invocation:
17 ;
18 ; Lx51 your object file list, STARTUP.OBJ controls
19 ;
20 ;------------------------------------------------------------------------------
21 ;
22 ; User-defined <h> Power-On Initialization of Memory
23 ;
24 ; With the following EQU statements the initialization of memory
25 ; at processor reset can be defined:
26 ;
27 ; <o> IDATALEN: IDATA memory size <0x0-0x100>
28 ; <i> Note: The absolute start-address of IDATA memory is always 0
29 ; <i> The IDATA space overlaps physically the DATA and BIT areas.
0080 30 IDATALEN EQU 80H
31 ;
32 ; <o> XDATASTART: XDATA memory start address <0x0-0xFFFF>
33 ; <i> The absolute start address of XDATA memory
0000 34 XDATASTART EQU 0
35 ;
36 ; <o> XDATALEN: XDATA memory size <0x0-0xFFFF>
37 ; <i> The length of XDATA memory in bytes.
0000 38 XDATALEN EQU 0
39 ;
40 ; <o> PDATASTART: PDATA memory start address <0x0-0xFFFF>
41 ; <i> The absolute start address of PDATA memory
0000 42 PDATASTART EQU 0H
43 ;
44 ; <o> PDATALEN: PDATA memory size <0x0-0xFF>
45 ; <i> The length of PDATA memory in bytes.
0000 46 PDATALEN EQU 0H
47 ;
48 ;</h>
49 ;------------------------------------------------------------------------------
50 ;
51 ;<h> Reentrant Stack Initialization
52 ;
53 ; The following EQU statements define the stack pointer for reentrant
54 ; functions and initialized it:
55 ;
56 ; <h> Stack Space for reentrant functions in the SMALL model.
57 ; <q> IBPSTACK: Enable SMALL model reentrant stack
58 ; <i> Stack space for reentrant functions in the SMALL model.
A51 MACRO ASSEMBLER STARTUP 06/03/2021 22:01:20 PAGE 2
0000 59 IBPSTACK EQU 0 ; set to 1 if small reentrant is used.
60 ; <o> IBPSTACKTOP: End address of SMALL model stack <0x0-0xFF>
61 ; <i> Set the top of the stack to the highest location.
0100 62 IBPSTACKTOP EQU 0xFF +1 ; default 0FFH+1
63 ; </h>
64 ;
65 ; <h> Stack Space for reentrant functions in the LARGE model.
66 ; <q> XBPSTACK: Enable LARGE model reentrant stack
67 ; <i> Stack space for reentrant functions in the LARGE model.
0000 68 XBPSTACK EQU 0 ; set to 1 if large reentrant is used.
69 ; <o> XBPSTACKTOP: End address of LARGE model stack <0x0-0xFFFF>
70 ; <i> Set the top of the stack to the highest location.
0000 71 XBPSTACKTOP EQU 0xFFFF +1 ; default 0FFFFH+1
72 ; </h>
73 ;
74 ; <h> Stack Space for reentrant functions in the COMPACT model.
75 ; <q> PBPSTACK: Enable COMPACT model reentrant stack
76 ; <i> Stack space for reentrant functions in the COMPACT model.
0000 77 PBPSTACK EQU 0 ; set to 1 if compact reentrant is used.
78 ;
79 ; <o> PBPSTACKTOP: End address of COMPACT model stack <0x0-0xFFFF>
80 ; <i> Set the top of the stack to the highest location.
0100 81 PBPSTACKTOP EQU 0xFF +1 ; default 0FFH+1
82 ; </h>
83 ;</h>
84 ;------------------------------------------------------------------------------
85 ;
86 ; Memory Page for Using the Compact Model with 64 KByte xdata RAM
87 ; <e>Compact Model Page Definition
88 ;
89 ; <i>Define the XDATA page used for PDATA variables.
90 ; <i>PPAGE must conform with the PPAGE set in the linker invocation.
91 ;
92 ; Enable pdata memory page initalization
0000 93 PPAGEENABLE EQU 0 ; set to 1 if pdata object are used.
94 ;
95 ; <o> PPAGE number <0x0-0xFF>
96 ; <i> uppermost 256-byte address of the page used for PDATA variables.
0000 97 PPAGE EQU 0
98 ;
99 ; <o> SFR address which supplies uppermost address byte <0x0-0xFF>
100 ; <i> most 8051 variants use P2 as uppermost address byte
00A0 101 PPAGE_SFR DATA 0A0H
102 ;
103 ; </e>
104 ;------------------------------------------------------------------------------
105
106 ; Standard SFR Symbols
00E0 107 ACC DATA 0E0H
00F0 108 B DATA 0F0H
0081 109 SP DATA 81H
0082 110 DPL DATA 82H
0083 111 DPH DATA 83H
112
113 NAME ?C_STARTUP
114
115
116 ?C_C51STARTUP SEGMENT CODE
117 ?STACK SEGMENT IDATA
118
---- 119 RSEG ?STACK
0000 120 DS 1
121
122 EXTRN CODE (?C_START)
123 PUBLIC ?C_STARTUP
124
A51 MACRO ASSEMBLER STARTUP 06/03/2021 22:01:20 PAGE 3
---- 125 CSEG AT 0
0000 020000 F 126 ?C_STARTUP: LJMP STARTUP1
127
---- 128 RSEG ?C_C51STARTUP
129
0000 130 STARTUP1:
131
132 IF IDATALEN <> 0
0000 787F 133 MOV R0,#IDATALEN - 1
0002 E4 134 CLR A
0003 F6 135 IDATALOOP: MOV @R0,A
0004 D8FD 136 DJNZ R0,IDATALOOP
137 ENDIF
138
139 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
153
154 IF PPAGEENABLE <> 0
MOV PPAGE_SFR,#PPAGE
ENDIF
157
158 IF PDATALEN <> 0
MOV R0,#LOW (PDATASTART)
MOV R7,#LOW (PDATALEN)
CLR A
PDATALOOP: MOVX @R0,A
INC R0
DJNZ R7,PDATALOOP
ENDIF
166
167 IF IBPSTACK <> 0
EXTRN DATA (?C_IBP)
MOV ?C_IBP,#LOW IBPSTACKTOP
ENDIF
172
173 IF XBPSTACK <> 0
EXTRN DATA (?C_XBP)
MOV ?C_XBP,#HIGH XBPSTACKTOP
MOV ?C_XBP+1,#LOW XBPSTACKTOP
ENDIF
179
180 IF PBPSTACK <> 0
EXTRN DATA (?C_PBP)
MOV ?C_PBP,#LOW PBPSTACKTOP
ENDIF
184
0006 758100 F 185 MOV SP,#?STACK-1
186
187 ; This code is required if you use L51_BANK.A51 with Banking Mode 4
188 ;<h> Code Banking
189 ; <q> Select Bank 0 for L51_BANK.A51 Mode 4
190
A51 MACRO ASSEMBLER STARTUP 06/03/2021 22:01:20 PAGE 4
195 ;</h>
0009 020000 F 196 LJMP ?C_START
197
198 END
A51 MACRO ASSEMBLER STARTUP 06/03/2021 22:01:20 PAGE 5
SYMBOL TABLE LISTING
------ ----- -------
N A M E T Y P E V A L U E ATTRIBUTES
?C_C51STARTUP. . . C SEG 000CH REL=UNIT
?C_START . . . . . C ADDR ----- EXT
?C_STARTUP . . . . C ADDR 0000H A
?STACK . . . . . . I SEG 0001H REL=UNIT
ACC. . . . . . . . D ADDR 00E0H A
B. . . . . . . . . D ADDR 00F0H A
DPH. . . . . . . . D ADDR 0083H A
DPL. . . . . . . . D ADDR 0082H A
IBPSTACK . . . . . N NUMB 0000H A
IBPSTACKTOP. . . . N NUMB 0100H A
IDATALEN . . . . . N NUMB 0080H A
IDATALOOP. . . . . C ADDR 0003H R SEG=?C_C51STARTUP
PBPSTACK . . . . . N NUMB 0000H A
PBPSTACKTOP. . . . N NUMB 0100H A
PDATALEN . . . . . N NUMB 0000H A
PDATASTART . . . . N NUMB 0000H A
PPAGE. . . . . . . N NUMB 0000H A
PPAGEENABLE. . . . N NUMB 0000H A
PPAGE_SFR. . . . . D ADDR 00A0H A
SP . . . . . . . . D ADDR 0081H A
STARTUP1 . . . . . C ADDR 0000H R SEG=?C_C51STARTUP
XBPSTACK . . . . . N NUMB 0000H A
XBPSTACKTOP. . . . N NUMB 0000H A
XDATALEN . . . . . N NUMB 0000H A
XDATASTART . . . . N NUMB 0000H A
REGISTER BANK(S) USED: 0
ASSEMBLY COMPLETE. 0 WARNING(S), 0 ERROR(S)
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