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A51 MACRO ASSEMBLER STARTUP 05/28/2008 17:54:11 PAGE 1
MACRO ASSEMBLER A51 V7.08a
OBJECT MODULE PLACED IN STARTUP.OBJ
ASSEMBLER INVOKED BY: d:\Keil\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) 1988-2002 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 , STARTUP.OBJ
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 05/28/2008 17:54:11 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
82 ?C_C51STARTUP SEGMENT CODE
83 ?STACK SEGMENT IDATA
84
---- 85 RSEG ?STACK
0000 86 DS 1
87
88 EXTRN CODE (?C_START)
89 PUBLIC ?C_STARTUP
90
---- 91 CSEG AT 0
0000 020000 F 92 ?C_STARTUP: LJMP STARTUP1
93
---- 94 RSEG ?C_C51STARTUP
95
0000 96 STARTUP1:
97
98 IF IDATALEN <> 0
0000 787F 99 MOV R0,#IDATALEN - 1
0002 E4 100 CLR A
0003 F6 101 IDATALOOP: MOV @R0,A
0004 D8FD 102 DJNZ R0,IDATALOOP
103 ENDIF
104
105 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
119
120 IF PPAGEENABLE <> 0
MOV PPAGE_SFR,#PPAGE
ENDIF
123
124 IF PDATALEN <> 0
A51 MACRO ASSEMBLER STARTUP 05/28/2008 17:54:11 PAGE 3
MOV R0,#LOW (PDATASTART)
MOV R7,#LOW (PDATALEN)
CLR A
PDATALOOP: MOVX @R0,A
INC R0
DJNZ R7,PDATALOOP
ENDIF
132
133 IF IBPSTACK <> 0
EXTRN DATA (?C_IBP)
MOV ?C_IBP,#LOW IBPSTACKTOP
ENDIF
138
139 IF XBPSTACK <> 0
EXTRN DATA (?C_XBP)
MOV ?C_XBP,#HIGH XBPSTACKTOP
MOV ?C_XBP+1,#LOW XBPSTACKTOP
ENDIF
145
146 IF PBPSTACK <> 0
EXTRN DATA (?C_PBP)
MOV ?C_PBP,#LOW PBPSTACKTOP
ENDIF
150
0006 758100 F 151 MOV SP,#?STACK-1
152 ; This code is required if you use L51_BANK.A51 with Banking Mode 4
153 ; EXTRN CODE (?B_SWITCH0)
154 ; CALL ?B_SWITCH0 ; init bank mechanism to code bank 0
0009 020000 F 155 LJMP ?C_START
156
157 END
A51 MACRO ASSEMBLER STARTUP 05/28/2008 17:54:11 PAGE 4
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 0000H 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)