encoder.asm

来自「RFID功能中阅读器源代码,实现汽车的无钥匙进入功能」· 汇编 代码 · 共 48 行

;---------------------------------------------------------									
ENCODER_STEP_1	
		BCF 	STATUS,RP0 		;Bank 2
		BSF 	STATUS,RP1		
								
		MOVLW 	.2				;STEP 1
		MOVWF 	CRCON			;Load the 64-bit decryption key into the KEELOQ
								;peripheralˇs Key register.
		MOVLW	0XEF
		MOVWF	CRDAT0
		
		MOVLW	0XCD
		MOVWF	CRDAT1
		
		MOVLW	0XAB
		MOVWF	CRDAT2
		
		MOVLW	0X89
		MOVWF	CRDAT3

		MOVLW 	.3				
		MOVWF 	CRCON
		
		MOVLW	0X67
		MOVWF	CRDAT0
		
		MOVLW	0X45
		MOVWF	CRDAT1
		
		MOVLW	0X23
		MOVWF	CRDAT2
		
		MOVLW	0X01
		MOVWF	CRDAT3		
ENCODER_STEP_2
		MOVLW 	.0 				;STEP 2
		MOVWF 	CRCON			;Load the predefined variables into the 32-bit
								;Code Shift Register (CSR).
		;MOVFW	CSR0	
		MOVLW	0X00			;Sync. counter 8-bit LSB
		MOVWF	CRDAT0
		
		;MOVFW	CSR1
		MOVLW	0X00			;Sync. counter 8-bit MSB
		MOVWF	CRDAT1
		
		;MOVFW	CSR2
		MOVLW	b'00000011'		;醚