readwriteflash.#1

C8051F系列单片机Flash读写程序,可存储非易失数据.

$INCLUDE(C8051F310.INC)	; Register definition file.

    org 00h
    LJMP Config
    org 0B3h      ; End of Interrupt Vector space.
Config:
  	mov XBR0, #001h	; Crossbar Register 1
  	mov XBR1, #0C0h	; Crossbar Register 2
	  ANL	PCA0MD, #NOT(040h)      ; clear Watchdog Enable bit
    mov P2MDOUT, #10000100B ; Output configuration for P2 
	  mov OSCICN, #083h	 ; Internal Oscillator Control Register

main2:

MOV R0,#00H
MOV R1,#00H
  MOV DPTR,#0300H
MOV A,#00H
MOVC A,@A+DPTR
MOV R0,A
  MOV DPTR,#0301H
MOV A,#00H
MOVC A,@A+DPTR
MOV R1,A

SETB P2.2
SETB P2.7
CLR P2.2
CLR P2.7

//LJMP WRITE
CLR EA

WR:
MOV R0,#00H
MOV R1,#00H
SETB P2.7
SETB P2.2

READ01:
MOV DPTR,#0300H
MOV A,#00H
MOVC A,@A+DPTR
lcall delay25ms
MOV R0,A

XRL A,#01H
JZ P01
SETB P2.2
SETB P2.7
LJMP READ02

P01: CLR P2.2

READ02:
MOV DPTR,#0301H
MOV A,#00H
MOVC A,@A+DPTR
lcall delay25ms

MOV R1,A

XRL A,#02H
JZ P02	
SETB P2.2
SETB P2.7

MOV FLSCL,#10000000B
CLR EA     //1 关中断
ORL PSCTL,#00000010B
ORL PSCTL,#00000001B
MOV FLKEY,#0xA5
MOV FLKEY,#0xF1
MOV DPTR,#0300H
MOV A,#01H
MOVX @DPTR,A
ANL PSCTL,#11111101B

 MOV FLKEY,#0xA5
 MOV FLKEY,#0xF1
 MOV DPTR,#0300H
 MOV A,#01H
MOVX @DPTR,A
 MOV FLKEY,#0xA5
 MOV FLKEY,#0xF1
 MOV DPTR,#0301H
 MOV A,#02H
MOVX @DPTR,A
ANL PSCTL,#11111110B
setb P2.2
SETB P2.7
ajmp $

P02: 
CLR P2.7

AJMP $

delay25ms: 			mov    		r3,	#05          					;2      
delay25msa:   	mov      	r1,	#200        					;2     
delay25msb:   	mov      	r2,	#164        					;2
             		djnz  		r2,	$              				;2/3   		2+164*3+2=496  
             		nop                     						;1     		496+1=497
             		djnz  		r1,	delay25msb     				;2/3    	2+(497+3)*200+2=100004
        				djnz 			r3,	delay25msa           	;2/3      2+()*5+2=500024
             		ret                     						;1        500025     ;;;need 20MHz			
				




END