📄 banksm59128.lst
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A51 MACRO ASSEMBLER BANKSM59128 12/11/2006 09:13:36 PAGE 1
MACRO ASSEMBLER A51 V7.07
OBJECT MODULE PLACED IN .\output\BankSM59128.obj
ASSEMBLER INVOKED BY: C:\Keil\C51\BIN\A51.EXE BankSM59128.a51 SET(SMALL) DEBUG PRINT(.\listing\BankSM59128.lst) OBJECT(.
\output\BankSM59128.obj) EP
LOC OBJ LINE SOURCE
1 ; BankSM59128.a51
2 ; modified from L51_bank.a51
3 ;
4 $nomod51 NOLINES
5 $nocond
6 ;------------------------------------------------------------------------------
7 ; This file is part of the BL51 / LX51 Banked Linker/Locater package
8 ; Copyright (c) 1988 - 2001 Keil Elektronik GmbH and Keil Software, Inc.
9 ; Version 2.21 (Code and Variable Banking for Classic 8051 Derivatives)
10 ;------------------------------------------------------------------------------
11 ;************************ Configuration Section *******************************
0002 12 ?B_NBANKS EQU 2 ; Define maximum Number of Banks *
13 ; ; following values are allowed: 2, 4, 8, 16, 32, 64 *
14 ; ; for BL51 the maximum value for ?B_BANKS is 32 *
15 ; ; for LX51 the maximum value for ?B_BANKS is 64 *
16 ; *
0004 17 ?B_MODE EQU 4 ; 0 for Bank-Switching via 8051 Port *
18 ; ; 1 for Bank-Switching via XDATA Port *
19 ; ; 4 for user-provided bank switch code *
20 ; *
0000 21 ?B_RTX EQU 0 ; 0 for applications without real-time OS *
22 ; ; 1 for applications using the RTX-51 real-time OS *
23 ; *
0001 24 ?B_VAR_BANKING EQU 1 ; Variable Banking via L51_BANK (far memory support)*
25 ; ; 0 Variable Banking does not use L51_BANK.A51 *
26 ; ; 1 Variable Banking uses this L51_BANK.A51 module *
27 ; Notes: ?B_VAR_BANKING uses the 'far' and 'far const' C51 memory types to *
28 ; extent the space for variables in RAM and/or ROM of classic 8051 *
29 ; device. The same hardware as for code banking is used. Program *
30 ; code banking and variable banking share the same hardware I/O pins. *
31 ; The C51 Compiler must be used with the VARBANKING directive. *
32 ; Variable Banking is only supported with the LX51 linker/locater. *
33 ; *
00FF 34 ?B_RST_BANK EQU 0xFF ; specifies the active code bank number after CPU *
35 ; ; Reset. Used to reduce the entries in the *
36 ; ; INTERBANK CALL TABLE. The value 0xFF disables *
37 ; ; this LX51 linker/locater optimization. *
38 ; Note: Interbank Call Table optimization is only possible with LX51. *
39 ; *
40 ;-----------------------------------------------------------------------------*
41 ; *
ENDIF; *
53 ; *
ENDIF; *
62 ; *
63 IF ?B_MODE = 4; *
64 ;-----------------------------------------------------------------------------*
65 ; if ?BANK?MODE is 4 define the following switch macros *
66 ; For bank switching via user-provided bank switch code you must define for *
67 ; each memory bank a own macro which contains the bank switch code. The *
68 ; following example shows how to use the I/O lines P1.4 and P1.7 for bank *
69 ; switching. Since you can select just 4 banks with two address lines, just *
70 ; four macros are defined. The number of macros must conform with the number *
71 ; ?B_NBANKS number, i.e. for an application with 16 memory banks you must *
72 ; define 16 macros. *
73 ; *
74 ; IMPORTANT NOTES: *
A51 MACRO ASSEMBLER BANKSM59128 12/11/2006 09:13:36 PAGE 2
75 ; 1. The bank switch logic must be initialized before using it. Therefore *
76 ; add the following lines of code at the end of the STARTUP.A51 file: *
77 ; : *
78 ; EXTRN CODE (?B_SWITCH0) *
79 ; CALL ?B_SWITCH0 ; init bank mechanism to code bank 0 *
80 ; LJMP ?C_START ; line already exits at the end of file *
81 ; : *
82 ; *
83 ; 2. If the bank switch macros and the additional control code generate more *
84 ; than 256 bytes, you need to set the LONG_MACRO flag below. The error *
85 ; message "BANK SWITCH CODE BIGGER THAN 256 BYTES, SET LONG_MACRO TO 1" *
86 ; is generated in case that this is required. *
87 ; *
88 ; 3. The only registers that can be modified in this routines without prior *
89 ; saving are: DPTR and ACC. *
90 ; *
91 ; *
0000 92 LONG_MACRO EQU 0 ; 0 default, for normal macros and up to 8 banks *
93 ; ; 1 big macro code or many banks *
94 ; *
95 ; *
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00BF 119 sconf DATA 0BfH ;
120 SWITCH0 MACRO ; Switch to Memory Bank #0 *
121 ANL SCONF,#0F7H ; Clear SCONF Bit 3
122 ENDM *
123 ; *
124 SWITCH1 MACRO ; Switch to Memory Bank #1 *
125 ORL sconf,#08h ; SETB SCONF Bit 3 *
126 ENDM
127 ENDIF; *
128 ; *
129 IF ?B_VAR_BANKING = 1; *
130 ; *
0000 131 XMEM EQU 0x02000000 ; LX51 xdata symbol offset: do not change! *
132 ; *
133 ;******* Configuration Section for uVision2 Memory Simulation Support *********
134 ; *
135 ; The following settings allow you to map the physical xdata and code memory *
136 ; banks into simulation memory of the uVision2 Simulator. *
137 ; *
B800 138 ?B?XSTART EQU 0xB800 ; Start of xdata bank area *
FFFF 139 ?B?XEND EQU 0xFFFF ; Stop of xdata bank area *
A51 MACRO ASSEMBLER BANKSM59128 12/11/2006 09:13:36 PAGE 3
0000 140 ?B?XMEM EQU XMEM+0x010000 ; First HDATA memory bank in xdata space *
141 ; *
142 ; The above setting redirects the symbols in the area X:0x20000 .. X:0x2FFFF *
143 ; into the uVision2 simulation memory area for the EEPROM V:0 .. V:0xFFFF *
144 ; *
145 ;-----------------------------------------------------------------------------*
146 ; *
147 PUBLIC ?B?XSTART, ?B?XEND, ?B?XMEM; *
148 ENDIF; *
149 ; *
150 ;******************************************************************************
151 ; *
152 ; THEORY OF OPERATION *
153 ; ------------------- *
154 ; The section below describes the code generated by BL51 or LX51 and the *
155 ; operation of the L51_BANK.A51 module. BL51/LX51 generates for each *
156 ; function that is located in a code memory bank and called from the common *
157 ; area or a different code bank and entry into the INTRABANK CALL TABLE. The *
158 ; INTRABANK CALL TABLE is located in the SEGMENT ?BANK?SELECT and listed in *
159 ; the Linker MAP file. The entries in that TABLE have the following format: *
160 ; *
161 ; ?FCT?1: MOV DPTR,#FCT ; Load Address of target FCT *
162 ; JMP ?B_BANKn ; Switch to Bank and Jump to Target Code *
163 ; *
164 ; Instead of directly calling the function FCT, the Linker changes the entry *
165 ; to ?FCT?1. This entry selects the bank where the function FCT is located *
166 ; and calls that function via the routines defined in this L51_BANK.A51 file. *
167 ; The L51_BANK.A51 file contains two sets of functions for each bank: *
168 ; *
169 ; ?B_BANKn is a routine which saves the entry of the ?B_SWITCHn function *
170 ; for the current active bank on the STACK and switches to the *
171 ; bank 'n'. Then it jumps to the address specified by the DPTR *
172 ; register. It is allowed to modify the following registers in *
173 ; the ?B_BANKn routine: A, B, R0, DPTR, PSW *
174 ; *
175 ; ?B_SWITCHn is a function which selects the bank 'n'. This function is *
176 ; used at the end of a user function to return to the calling *
177 ; code bank. Only the following registers may be altered in the *
178 ; ?B_SWITCHn function: R0, DPTR *
179 ; *
180 ; The current active bank is stored in ?B_CURRENTBANK. RTX-51 uses this *
181 ; variable to restore the code bank after a task switch. To get correct *
182 ; results, ?B_CURRENTBANK must be set to the code bank before the hardware *
183 ; switch is done, or the code banking sequences must be interrupt protected. *
184 ;******************************************************************************
185
186 NAME ?BANK?SWITCHING
187
188 PUBLIC ?B_NBANKS, ?B_MODE, ?B_CURRENTBANK, ?B_MASK
189 PUBLIC ?B_FACTOR, ?B_RST_BANK
ENDIF
193
194 ; Standard SFR Symbols required in L51_BANK.A51
00E0 195 ACC DATA 0E0H
00F0 196 B DATA 0F0H
0082 197 DPL DATA 82H
0083 198 DPH DATA 83H
00A8 199 IE DATA 0A8H
00AF 200 EA BIT IE.7
201
202
203 ; generate Mask and Bank Number Information
204 IF ?B_NBANKS <= 2
0001 205 MASK EQU 00000001B
ENDIF
217
A51 MACRO ASSEMBLER BANKSM59128 12/11/2006 09:13:36 PAGE 4
ENDIF ; close block IF ?B_MODE = 0 *******************************************
465
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ENDIF ; close block IF ?B_MODE = 1 *******************************************
708
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710 IF ?B_MODE = 4 ;**************************************************************
711
0000 712 ?B_FACTOR EQU 0 ; Dummy Declarations
0000 713 ?B_FIRSTBIT EQU 0
0001 714 ?B_MASK EQU MASK
715
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