basic-52.asm

一个用PROTEUS搭建的51单片机的基本运行系统

	; First the tokens for statements
	;
	DB	80H		;LET TOKEN
	DB	'LET'
	;
	DB	81H		;CLEAR TOKEN
	DB	'CLEAR'
	;
	DB	82H		;PUSH TOKEN
	DB	'PUSH'
	;
T_GOTO	EQU	83H
	;
	DB	83H		;GO TO TOKEN
	DB	'GOTO'
	;
	DB	84H		;TOGGLE TOKEN
	DB	'PWM'
	;
	DB	85H		;PRINT HEX MODE 0
	DB	'PH0.'
	;
	DB	86H		;USER IN TOKEN
	DB	'UI'
	;
	DB	87H		;USER OUT TOKEN
	DB	'UO'
	;
	DB	88H		;POP TOKEN
	DB	'POP'
	;
$EJECT
	DB	89H		;PRINT TOKEN
	DB	'PRINT'
	DB	89H
	DB	'P.'		;P. ALSO MEANS PRINT
	DB	89H		;? ALSO
	DB	'?'
	;
	DB	8AH		;CALL TOKEN
	DB	'CALL'
	;
	DB	8BH		;DIMENSION TOKEN
	DB	'DIM'
	;
	DB	8CH		;STRING TOKEN
	DB	'STRING'
	;
	DB	8DH		;SET BAUD RATE
	DB	'BAUD'
	;
	DB	8EH		;CLOCK
	DB	'CLOCK'
	;
	DB	8FH		;PRINT HEX MODE 1
	DB	'PH1.'
	;
T_STOP	EQU	90H		;STOP TOKEN
	DB	T_STOP
	DB	'STOP'
	;
T_DIR	EQU	T_STOP		;NO DIRECT FROM HERE ON
	;
	DB	T_STOP+1	;ON TIMER INTERRUPT
	DB	'ONTIME'
	;
	DB	T_STOP+2	;ON EXTERNAL INTERRUPT
	DB	'ONEX1'
	;
	DB	T_STOP+3	;RETURN FROM INTERRUPT
	DB	'RETI'
	;
	DB	T_STOP+4	;DO TOKEN
	DB	'DO'
	;
	DB	T_STOP+5	;RESTORE TOKEN
	DB	'RESTORE'
	;
$EJECT
T_REM	EQU	T_STOP+6	;REMARK TOKEN
	DB	T_REM
	DB	'REM'
	;
	DB	T_REM+1		;NEXT TOKEN
	DB	'NEXT'
	;
	DB	T_REM+2		;ON ERROR TOKEN
	DB	'ONERR'
	;
	DB	T_REM+3		;ON TOKEN
	DB	'ON'
	;
	DB	T_REM+4		;INPUT
	DB	'INPUT'
	;
	DB	T_REM+5		;READ
	DB	'READ'
	;
T_DATA	EQU	T_REM+6		;DATA
	DB	T_DATA
	DB	'DATA'
	;
	DB	T_DATA+1	;RETURN
	DB	'RETURN'
	;
	DB	T_DATA+2	;IF
	DB	'IF'
	;
T_GOSB	EQU	T_DATA+3	;GOSUB
	DB	T_GOSB
	DB	'GOSUB'
	;
	DB	T_GOSB+1	;FOR
	DB	'FOR'
	;
	DB	T_GOSB+2	;WHILE
	DB	'WHILE'
	;
	DB	T_GOSB+3	;UNTIL
	DB	'UNTIL'
	;
	DB	T_GOSB+4	;END
	DB	'END'
	;
$EJECT
T_LAST	EQU	T_GOSB+5	;LAST INITIAL TOKEN
	;
T_TAB	EQU	T_LAST		;TAB TOKEN
	DB	T_TAB
	DB	'TAB'
	;
T_THEN	EQU	T_LAST+1	;THEN TOKEN
	DB	T_THEN
	DB	'THEN'
	;
T_TO	EQU	T_LAST+2	;TO TOKEN
	DB	T_TO
	DB	'TO'
	;
T_STEP	EQU	T_LAST+3	;STEP TOKEN
	DB	T_STEP
	DB	'STEP'
	;
T_ELSE	EQU	T_LAST+4	;ELSE TOKEN
	DB	T_ELSE
	DB	'ELSE'
	;
T_SPC	EQU	T_LAST+5	;SPACE TOKEN
	DB	T_SPC
	DB	'SPC'
	;
T_CR	EQU	T_LAST+6
	DB	T_CR
	DB	'CR'
	;
	DB	T_CR+1
	DB	'IDLE'
	;
	DB	T_CR+2
	DB	'ST@'
	;
	DB	T_CR+3
	DB	'LD@'
	;
	DB	T_CR+4
	DB	'PGM'
	;
	DB	T_CR+5
	DB	'RROM'
	;
$EJECT
	; Operator tokens
	;
T_LPAR	EQU	0E0H		;LEFT PAREN
	DB	T_LPAR
	DB	'('
	;
	DB	T_LPAR+1	;EXPONENTIAN
	DB	'**'
	;
	DB	T_LPAR+2	;FP MULTIPLY
	DB	'*'
	;
T_ADD	EQU	T_LPAR+3
	DB	T_LPAR+3	;ADD TOKEN
	DB	'+'
	;
	DB	T_LPAR+4	;DIVIDE TOKEN
	DB	'/'
	;
T_SUB	EQU	T_LPAR+5	;SUBTRACT TOKEN
	DB	T_SUB
	DB	'-'
	;
	DB	T_LPAR+6	;LOGICAL EXCLUSIVE OR
	DB	'.XOR.'
	;
	DB	T_LPAR+7	;LOGICAL AND
	DB	'.AND.'
	;
	DB	T_LPAR+8	;LOGICAL OR
	DB	'.OR.'
	;
T_NEG	EQU	T_LPAR+9
	;
T_EQU	EQU	T_LPAR+10	;EQUAL
	DB	T_EQU
	DB	'='
	;
	DB	T_LPAR+11	;GREATER THAN OR EQUAL
	DB	'>='
	;
	DB	T_LPAR+12	;LESS THAN OR EQUAL
	DB	'<='
	;
	DB	T_LPAR+13	;NOT EQUAL
	DB	'<>'
	;
	DB	T_LPAR+14	;LESS THAN
	DB	'<'
	;
	DB	T_LPAR+15	;GREATER THAN
	DB	'>'
	;
	;
T_UOP	EQU	0B0H		;UNARY OP BASE TOKEN
	;
	DB	T_UOP		;ABS TOKEN
	DB	'ABS'
	;
	DB	T_UOP+1		;INTEGER TOKEN
	DB	'INT'
	;
	DB	T_UOP+2		;SIGN TOKEN
	DB	'SGN'
	;
	DB	T_UOP+3		;GET TOKEN
	DB	'NOT'
	;
	DB	T_UOP+4		;COSINE TOKEN
	DB	'COS'
	;
	DB	T_UOP+5		;TANGENT TOKEN
	DB	'TAN'
	;
	DB	T_UOP+6		;SINE TOKEN
	DB	'SIN'
	;
	DB	T_UOP+7		;SQUARE ROOT TOKEN
	DB	'SQR'
	;
	DB	T_UOP+8		;CBYTE TOKEN
	DB	'CBY'
	;
	DB	T_UOP+9		;EXP (E TO THE X) TOKEN
	DB	'EXP'
	;
	DB	T_UOP+10
	DB	'ATN'
	;
	DB	T_UOP+11
	DB	'LOG'
	;
	DB	T_UOP+12	;DBYTE TOKEN
	DB	'DBY'
	;
	DB	T_UOP+13	;XBYTE TOKEN
	DB	'XBY'
	;
T_ULAST	EQU	T_UOP+14	;LAST OPERATOR NEEDING PARENS
	;
	DB	T_ULAST
	DB	'PI'
	;
	DB	T_ULAST+1	;RND TOKEN
	DB	'RND'
	;
	DB	T_ULAST+2	;GET TOKEN
	DB	'GET'
	;
	DB	T_ULAST+3	;FREE TOKEN
	DB	'FREE'
	;
	DB	T_ULAST+4	;LEN TOKEN
	DB	'LEN'
	;
T_XTAL	EQU	T_ULAST+5	;CRYSTAL TOKEN
	DB	T_XTAL
	DB	'XTAL'
	;
T_MTOP	EQU	T_ULAST+6	;MTOP
	DB	T_MTOP
	DB	'MTOP'
	;
T_IE	EQU	T_ULAST+8	;IE REGISTER
	DB	T_IE
	DB	'IE'
	;
T_IP	EQU	T_ULAST+9	;IP REGISTER
	DB	T_IP
	DB	'IP'
	;
TMR0	EQU	T_ULAST+10	;TIMER 0
	DB	TMR0
	DB	'TIMER0'
	;
TMR1	EQU	T_ULAST+11	;TIMER 1
	DB	TMR1
	DB	'TIMER1'
	;
TMR2	EQU	T_ULAST+12	;TIMER 2
	DB	TMR2
	DB	'TIMER2'
	;
T_TIME	EQU	T_ULAST+7	;TIME
	DB	T_TIME
	DB	'TIME'
	;
TT2C	EQU	T_ULAST+13	;T2CON
	DB	TT2C
	DB	'T2CON'
	;
TTC	EQU	T_ULAST+14	;TCON
	DB	TTC
	DB	'TCON'
	;
TTM	EQU	T_ULAST+15	;TMOD
	DB	TTM
	DB	'TMOD'
	;
TRC2	EQU	T_ULAST+16	;RCAP2
	DB	TRC2
	DB	'RCAP2'
	;
T_P1	EQU	T_ULAST+17	;P1
	DB	T_P1
	DB	'PORT1'
	;
T_PC	EQU	T_ULAST+18	;PCON
	DB	T_PC
	DB	'PCON'
	;
T_ASC	EQU	T_ULAST+19	;ASC TOKEN
	DB	T_ASC
	DB	'ASC('
	;
T_USE	EQU	T_ULAST+20	;USING TOKEN
	DB	T_USE
	DB	'USING('
	DB	T_USE
	DB	'U.('
	;
T_CHR	EQU	T_ULAST+21	;CHR TOKEN
	DB	T_CHR
	DB	'CHR('
	;
$EJECT
T_CMND	EQU	0F0H		;COMMAND BASE
	;
	DB	0F0H		;RUN TOKEN
	DB	'RUN'
	;
	DB	0F1H		;LIST TOKEN
	DB	'LIST'
	;
	DB	0F2H		;NULL TOKEN
	DB	'NULL'
	;
	DB	0F3H		;NEW TOKEN
	DB	'NEW'
	;
	DB	0F4H		;CONTINUE TOKEN
	DB	'CONT'
	;
	DB	0F5H		;PROGRAM TOKEN
	DB	'PROG'
	;
	DB	0F6H		;TRANSFER TOKEN
	DB	'XFER'
	;
	DB	0F7H		;RAM MODE
	DB	'RAM'
	;
	DB	0F8H		;ROM MODE
	DB	'ROM'
	;
	DB	0F9H		;INTELLIGENT PROM PROGRAMMING
	DB	'FPROG'
	;
	DB	0FFH		;END OF TABLE
	;

; END OF INCLUDE LOOK52
;$INCLUDE(:F2:LOOK52.SRC)
	;
EIG:	DB	'EXTRA IGNORED"'
	;
EXA:	DB	'A-STACK"'
	;
EXC:	DB	'C-STACK"'
	;
$EJECT
;$INCLUDE(:F2:BAS52.RST)
; BEGINNING

	;**************************************************************
	;
CRST:	; This performs system initialzation, it was moved here so the
	; new power on reset functions could be tested in an 8751.
	;
	;**************************************************************
	;
	; First, initialize SFR's
	;
	MOV	SCON,#5AH	;INITIALIZE SFR'S
	MOV	TMOD,#10H
	MOV	TCON,#54H
	DB	75H		;MOV DIRECT, # OP CODE
	DB	0C8H		;T2CON LOCATION
	DB	34H		;CONFIGURATION BYTE
	;
	MOV	DPTR,#2001H	;READ CODE AT 2001H
	CLR	A
	MOVC	A,@A+DPTR
	CJNE	A,#0AAH,$+6	;IF IT IS AN AAH, DO USER RESET
	LCALL	2090H
	;
	MOV	R0,#IRAMTOP	;PUT THE TOP OF RAM IN R0
	CLR	A		;ZERO THE ACC
	;
	MOV	@R0,A		;CLEAR INTERNAL MEMORY
	DJNZ	R0,$-1		;LOOP TIL DONE
	;
	; Now, test the external memory
	;
	MOV	SPSAV,#CMNDSP	;SET UP THE STACK
	MOV	SP,SPSAV
	;
	MOV	BOFAH,#HIGH ROMADR
	MOV	BOFAL,#LOW ROMADR+17
	MOV	DPTR,#ROMADR	;GET THE BYTE AT 8000H
	MOVX	A,@DPTR
	CLR	C
	SUBB	A,#31H		;FOR BIAS
	MOV	MT1,A		;SAVE IN DIRECT MATH LOC
	CLR	ACC.2		;SAVE FOR RESET
	MOV	R7,A		;SAVE IT IN R7
	INC	DPTR
	ACALL	L31DPI		;GET SAVED BAUD RATE
     	LCALL	RCL
	INC	DPTR		;GET MEMTOP
	ACALL	L31DPI
	MOV	DPTR,#5FH	;READ THE EXTERNAL BYTE
	MOVX	A,@DPTR
	MOV	DPTR,#0		;ESTABLISH BASE FOR CLEAR
	CJNE	A,#0A5H,CRS
	MOV	A,MT1
	CLR	ACC.0		;CLEAR BIT ONE
	XRL	A,#4H
	JZ	CR2
	;
CRS:	CJNE	R7,#2,$+5
	SJMP	$+5
	CJNE	R7,#3,$+7
	ACALL	CL_1
	SJMP	CR1
	;
CR0:	MOV	R3,DPH		;SAVE THE DPTR
	MOV	R1,DPL
	INC	DPTR
	MOV	A,#5AH
	MOVX	@DPTR,A
	MOVX	A,@DPTR
	CJNE	A,#5AH,CR1
	CLR	A
	MOVX	@DPTR,A
	CJNE	R3,#0E0H,CR0
	;
CR1:	CJNE	R3,#03H,$+3	;NEED THIS MUCH RAM
	JC	CRST
	MOV	DPTR,#MEMTOP	;SAVE MEMTOP
	ACALL	S31DP2		;SAVE MEMTOP AND SEED RCELL
	ACALL	CNEW		;CLEAR THE MEMORY AND SET UP POINTERS
	;
CR2:	ACALL	RC1		;SET UP STACKS IF NOT DONE
	;
	LCALL	AXTAL0		;DO THE CRYSTAL
	MOV	A,MT1		;GET THE RESET BYTE
	CJNE	A,#5,$+6
	LCALL	4039H
	JNC	BG1		;CHECK FOR 0,1,2,3, OR 4
	JNB	ACC.0,BG3	;NO RUN IF WRONG TYPE
	MOV	DPTR,#ROMADR+16
	MOVX	A,@DPTR		;READ THE BYTE
	CJNE	A,#55H,BG3
	LJMP	CRUN
	;
BG1:	CLR	A		;DO BAUD RATE
	MOV	R3,A
	MOV	R1,A
	MOV	R0,#4
	JB	RXD,$		;LOOP UNTIL A CHARACTER IS RECEIVED
	;
BG2:	DJNZ	R0,$		;FOUR CLOCKS, IN LOOP
	CALL	DEC3210+4	;NINE CLOCKS
	MOV	R0,#2		;ONE CLOCK
	JNB	RXD,BG2		;TWO CLOCKS, LOOP UNTIL DONE
	JB	RXD,$		;WAIT FOR STOP CHARACTER TO END
	JNB	RXD,$
	CALL	RCL		;LOAD THE TIMER
	;
BG3:	MOV	DPTR,#S_N	;GET THE MESSAGE
	ACALL	CRP		;PRINT IT
	LJMP	CRAM

; END
;$INCLUDE(:F2:BAS52.RST)
	;
$EJECT
	;***************************************************************
	;
	; CIPROG AND CPROG - Program a prom
	;
	;***************************************************************
	;
;$INCLUDE(:F2:BAS52.PGM)
;BEGINNING

PG8:	MOV	R7,#00H		;PROGRAM ONE BYTE AT A TIME
	MOV	R6,#01H
	MOV	R2,#HIGH ROMADR-1
	MOV	R0,#LOW ROMADR-1;LOAD PROM ADDRESS
	ACALL	PG1+3
	INC	R6
	DB	0E5H		;MOV A DIRECT OP CODE
	DB	0CBH		;ADDRESS OF R2CAP HIGH
	ACALL	PG1+3
	DB	0E5H		;MOV A, DIRECT OP CODE
	DB	0CAH		;R2CAP LOW
	MOV	R6,#3
	MOV	R1,#LOW MEMTOP-1
	MOV	R3,#HIGH MEMTOP
	ACALL	PG1+3		;SAVE MEMTOP
	SJMP	PGR
	;
CIPROG:	MOV	DPTR,#IPROGS	;LOAD IPROG LOCATION
	SETB	INTELB
	SJMP	$+7		;GO DO PROG
	;
CPROG:	MOV	DPTR,#PROGS	;LOAD PROG LOCATION
	CLR	INTELB
	;
	ACALL	LD_T		;LOAD THE TIMER
	CLR	PROMV		;TURN ON THE PROM VOLTAGE
	CALL	DELTST		;SEE IF A CR
	JNZ	PG8		;SAVE TIMER IF SO
	MOV	R4,#0FEH
	SETB	INBIT
	ACALL	ROMFD		;GET THE ROM ADDRESS OF THE LAST LOCATION
	CALL	TEMPD		;SAVE THE ADDRESS
	MOV	A,R4		;GET COUNT
	CPL	A
	CALL	TWO_R2		;PUT IT ON THE STACK
	CALL	FP_BASE+14	;OUTPUT IT
	ACALL	CCAL		;GET THE PROGRAM