?? mon_bank.a51
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$NOCOND DEBUGPUBLICS
;------------------------------------------------------------------------------
; This file is part of the Monitor-51 Version 3 package
; Copyright KEIL ELEKTRONIK GmbH 1998
; Version 3.0
;
; Most of the settings in this file must conform with the settings
; in the file L51_BANK.A51 which is used for code banking with the
; BL51 Linker/Locater
;
;------------------------------------------------------------------------------
;************************ Configuration Section *******************************
?B_NBANKS EQU 8 ; Define max. Number of Code Banks (not *
; ; including XDATA or COMMON bank). *
; ; The max. value for ?B_BANKS is 32 *
; ; possible values are: 1,2,3,...32 *
; *
?B_MODE EQU 0 ; 0 for Bank-Switching via 8051 Port *
; ; 1 for Bank-Switching via XDATA Port *
; *
?B_BANKSTART EQU 08000H ; defines the start address of the code *
; ; banking area *
; *
?B_BANKEND EQU 0FFFFH ; defines the end address of the code *
; ; banking area *
; *
?B_COMMON EQU 0FFH ; 0FFH if the COMMON area is not mapped into *
; ; a code bank. *
; ; otherwise ?B_COMMON must be set to the *
; ; bank number which contains the COMMON area *
; *
?B_XRAM EQU 0FFH ; 0FFH if the XDATA RAM area is not mapped *
; ; into a code bank. *
; ; otherwise ?B_XRAM must be set to the bank *
; ; number which contains the XDATA RAM area *
; *
?B_MON_DATA_BANK EQU 007H ; Bank number where monitor data is stored *
; *
IF ?B_MODE = 0; *
;-----------------------------------------------------------------------------*
; if ?BANK?MODE is 0 define the following values *
; For Bank-Switching via 8051 Port define Port Address / Bits *
?B_PORT EQU P1 ; default is P1 *
?B_FIRSTBIT EQU 3 ; default is Bit 3 *
;-----------------------------------------------------------------------------*
ENDIF; *
;
IF ?B_MODE = 1; *
;-----------------------------------------------------------------------------*
; if ?BANK?MODE is 1 define the following values *
; For Bank-Switching via XDATA Port define XDATA Port Address / Bits *
?B_XDATAPORT EQU 0FFFFH ; default is XDATA Port Address 0FFFFH *
?B_FIRSTBIT EQU 0 ; default is Bit 0 *
;-----------------------------------------------------------------------------*
ENDIF; *
; *
; *
;******************************************************************************
NAME ?BANK?SWITCHING
PUBLIC ?B_NBANKS ; Number of Banks
PUBLIC ?B_MODE ; Banking Mode (currently 0)
PUBLIC ?B_COMMON ; Bank Number of the COMMON area
PUBLIC ?B_XRAM ; Bank Number of the XDATA RAM area
PUBLIC ?B_SWITCHBANK ; Change to the Bank specified in ACC
PUBLIC ?B_GETCURRBANK ; Returns in ACC the current Code Bank
PUBLIC ?B_BANKSTART ; Banking Area Start Address
PUBLIC ?B_BANKEND ; Banking Area End Address
PUBLIC ?B_INITBANKING ; e.g. Initialize the Bank Ident Number
PUBLIC ?B_MON_DATA_BANK; Bank number where monitor data is stored
; generate Mask and Bank Number Information
IF ?B_NBANKS <= 2
MASK EQU 00000001B
ELSEIF ?B_NBANKS <= 4
MASK EQU 00000011B
ELSEIF ?B_NBANKS <= 8
MASK EQU 00000111B
ELSEIF ?B_NBANKS <= 16
MASK EQU 00001111B
ELSE
MASK EQU 00011111B
ENDIF
?B_MASK EQU MASK SHL ?B_FIRSTBIT
CODE_AREA SEGMENT CODE
RSEG CODE_AREA
IF ?B_FIRSTBIT = 0
CONVTOPIN MACRO
ENDM
ENDIF
IF ?B_FIRSTBIT = 1
CONVTOPIN MACRO
RL A
ENDM
ENDIF
IF ?B_FIRSTBIT = 2
CONVTOPIN MACRO
RL A
RL A
ENDM
ENDIF
IF ?B_FIRSTBIT = 3
CONVTOPIN MACRO
SWAP A
RR A
ENDM
ENDIF
IF ?B_FIRSTBIT = 4
CONVTOPIN MACRO
SWAP A
ENDM
ENDIF
IF ?B_FIRSTBIT = 5
CONVTOPIN MACRO
SWAP A
RL A
ENDM
ENDIF
IF ?B_FIRSTBIT = 6
CONVTOPIN MACRO
RR A
RR A
ENDM
ENDIF
IF ?B_FIRSTBIT = 7
CONVTOPIN MACRO
RR A
ENDM
ENDIF
IF ?B_FIRSTBIT = 0
CONVTOBANK MACRO
ENDM
ENDIF
IF ?B_FIRSTBIT = 1
CONVTOBANK MACRO
RR A
ENDM
ENDIF
IF ?B_FIRSTBIT = 2
CONVTOBANK MACRO
RR A
RR A
ENDM
ENDIF
IF ?B_FIRSTBIT = 3
CONVTOBANK MACRO
SWAP A
RL A
ENDM
ENDIF
IF ?B_FIRSTBIT = 4
CONVTOBANK MACRO
SWAP A
ENDM
ENDIF
IF ?B_FIRSTBIT = 5
CONVTOBANK MACRO
SWAP A
RR A
ENDM
ENDIF
IF ?B_FIRSTBIT = 6
CONVTOBANK MACRO
RL A
RL A
ENDM
ENDIF
IF ?B_FIRSTBIT = 7
CONVTOBANK MACRO
RL A
ENDM
ENDIF
;------------------------
; Switchbank function
;------------------------
IF ?B_MODE = 0;
?B_SWITCHBANK:
IF ?B_COMMON <> 0FFH
CJNE A,#0FFH,SWB1
MOV A,#?B_COMMON
ENDIF
SWB1: ANL A,#MASK
CONVTOPIN
ANL ?B_PORT,#LOW (NOT ?B_MASK)
ORL ?B_PORT,A
NOP
RET
ENDIF
IF ?B_MODE = 1;
?B_SWITCHBANK: PUSH DPL
PUSH DPH
IF ?B_COMMON <> 0FFH
CJNE A,#0FFH,SWB1
MOV A,#?B_COMMON
ENDIF
SWB1: ANL A,#MASK
CONVTOPIN
MOV DPTR,#?B_XDATAPORT
MOVX @DPTR,A
POP DPH
POP DPL
RET
ENDIF
;------------------------
; Getbank function
;------------------------
IF ?B_MODE = 0;
?B_GETCURRBANK: MOV A,?B_PORT
CONVTOBANK
ANL A,#MASK
RET
ENDIF
IF ?B_MODE = 1;
?B_GETCURRBANK: PUSH DPL
PUSH DPH
MOV DPTR,#?B_BANKEND
CLR A
MOVC A,@A+DPTR
ANL A,#MASK
POP DPH
POP DPL
RET
ENDIF
;------------------------
; Init banking system
;------------------------
?B_INITBANKING:
; -----
; Add here code for user hardware initilization
; -----
IF ?B_MODE = 1; Write bank number into the last byte of each bank
MOV A,#?B_NBANKS
INIT_LOOP: DEC A
INIT1: CJNE A,#?B_XRAM,INIT2
SJMP INIT_LOOP
INIT2: CJNE A,#?B_COMMON,INIT3
SJMP INIT_LOOP
INIT3: PUSH ACC
CALL ?B_SWITCHBANK
POP ACC
MOV DPTR,#?B_BANKEND
MOVX @DPTR,A
JNZ INIT_LOOP
ENDIF
RET
END
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