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Ax51 User's Guide
Ax51 Introduction Assembling Programs Writing Assembly Programs Control Statements Macro Processor Error Messages 
Appendix 
A. Application Examples B. Reserved Symbols C. Listing File Format Listing File Heading Source Listing Macro / Include File / Save Stack Format Symbol Table Listing File Trailer D. Assembler Differences Between A51 and ASM51C. Listing File Format
This appendix describes the format of the listing file generated by the assembler.
Assembler Listing File Format
The Ax51 assembler, unless overridden by controls, outputs two files: an object file and a listing file. The object file contains the machine code. The listing file contains a formatted copy of your source code with page headers and, if requested through controls (SYMBOL or XREF), a symbol table.
Sample Ax51 Listing
Ax51 MACRO ASSEMBLER V1.40
OBJECT MODULE PLACED IN ASAMPLE1.OBJ
ASSEMBLER INVOKED BY: F:\RK\ZX\ASM\A51.EXE ASAMPLE1.A51 XREF
LOC OBJ LINE SOURCE
1 $NOMOD51
2 $INCLUDE (REG52.INC)
+1 3 +1 $SAVE
+1 106 +1 $RESTORE
107
108 NAME SAMPLE
109
110 EXTRN CODE (PUT_CRLF, PUTSTRING)
111 PUBLIC TXTBIT
112
------ 113 PROG SEGMENT CODE
------ 114 PCONST SEGMENT CODE
------ 115 VAR1 SEGMENT DATA
------ 116 BITVAR SEGMENT BIT
------ 117 STACK SEGMENT IDATA
118
------ 119 RSEG STACK
000000 120 DS 10H ; 16 Bytes Stack
121
000000 122 CSEG AT 0
123 USING 0 ; Register Bank 0
124 ; Execution starts at address 0 on power up.
000000 020000 F 125 JMP START
126
------ 127 RSEG PROG
128 ; first set Stack Pointer
000000 758100 F 129 START: MOV SP,#STACK 1
130
131 ; Initialize serial interface
132 ; Using TIMER 1 to Generate Baud Rates
133 ; Oscillator frequency = 11.059 MHz
000003 758920 134 MOV TMOD,#00100000B ;C/T = 0, Mode = 2
000006 758DFD 135 MOV TH1,#0FDH
000009 D28E 136 SETB TR1
00000B 759852 137 MOV SCON,#01010010B
138
139 ; clear TXTBIT to read form CODE Memory
00000E C200 F 140 CLR TXTBIT
141
142 ; This is the main program. It is a loop,
143 ; which displays the a text on the console.
000010 144 REPEAT:
145 ; type message
000010 900000 F 146 MOV DPTR,#TXT
000013 120000 E 147 CALL PUTSTRING
000016 120000 E 148 CALL PUT_CRLF
149 ; repeat
000019 8000 F 150 SJMP REPEAT
151 ;
------ 152 RSEG PCONST
000000 54455354 153 TXT: DB 'TEST PROGRAM',00H
000004 2050524F
000008 4752414D
00000C 00
154
155 ; only for demonstration
------ 156 RSEG VAR1
000000 157 DUMMY: DS 21H
158
159 ; TXTBIT = 0 read text from CODE Memory
160 ; TXTBIT = 1 read text from XDATA Memory
------ 161 RSEG BITVAR
0000.0 162 TXTBIT: DBIT 1
163
164 END
XREF SYMBOL TABLE LISTING
---- ------ ----- -------
N A M E T Y P E V A L U E ATTRIBUTES / REFERENCES
BITVAR . . . . . . B SEG 000001H REL=UNIT, ALN=BIT 116# 161
DUMMY. . . . . . . D ADDR 000000H R SEG=VAR1 157#
PCONST . . . . . . C SEG 00000DH REL=UNIT, ALN=BYTE 114# 152
PROG . . . . . . . C SEG 00001BH REL=UNIT, ALN=BYTE 113# 127
PUTSTRING. . . . . C ADDR ------- EXT 110# 147
PUT_CRLF . . . . . C ADDR ------- EXT 110# 148
REPEAT . . . . . . C ADDR 000010H R SEG=PROG 144# 150
SAMPLE . . . . . . 108
STACK. . . . . . . I SEG 000010H REL=UNIT, ALN=BYTE 117# 119 129
START. . . . . . . C ADDR 000000H R SEG=PROG 125 129#
TXT. . . . . . . . C ADDR 000000H R SEG=PCONST 146 153#
TXTBIT . . . . . . B ADDR 0000H.0 R SEG=BITVAR 111 140 162#
VAR1 . . . . . . . D SEG 000021H REL=UNIT, ALN=BYTE 115# 156
REGISTER BANK(S) USED: 0
ASSEMBLY COMPLETE. 0 WARNING(S), 0 ERROR(S)
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