TRIS PORTA
BTFSS RTCC,7 ; TEST FOR 32MS TIMEOUT ON RTCC MSB
RETLW 0 ; ... DO QUICK RETURN TO RECEIVE ROUTINE
; **** INCREASE 16 BIT CLOCK TIMER *******
BCF RTCC,7 ; CLEAR MSB OF RTCC
INCF CNT_LW,F ; INCREASE 16 COUNTER
SKPNZ ; INCREASE UPPER BYTE IF ZERO ( OVERFLOW )
INCF CNT_HI,F
RETLW 0
;------------------------------------------------------------------------------
;
; FUNCTION : TST_TIMER()
;
; DESCRIPTION : TEST 32MS TIMER AND UPDATE OUTPUTS IF REQUIRED
;
; NOTE : THIS ROUTINE MUST BE IN THE LOWER HALF OF THE PAGE
;
;------------------------------------------------------------------------------
TST_TIMER
; ***** TEST FOR 500 MS TIMEMOUT ON OUTPUTS **********
BTFSS CNT_LW,4 ; TEST FOR 500 MS TIMEOUT
GOTO TST_30 ; ... IF NOT TEST 30S TIMEOUT
MOV LW 0F0H
ANDWF PORTB,F ; DOWN ALL PULSE OUTPUTS
; ********* TEST FOR 30 S LEARN TIMEOUT *************
TST_30 BTFSS FLAGS,LRNF
GOTO TST_END
BTFSC CNT_HI,2 ; TEST FOR LEARN TIMEOUT
GOTO RESET ; ... IF LEARN TIMEMOUT FORCE SOFT RESET
TST_END
RETLW 0H
;------------------------------------------------------------------------------
;
; FUNCTION : SENDC ()
;
; DESCRIPTION : SEND EEPROM COMMAND
;
; NOTE : THIS ROUTINE MUST BE IN THE LOWER HALF OF THE PAGE
;
;------------------------------------------------------------------------------
SENDC
CLRWDT ; RESET WATCHDOG TIMER
BCF PORTB,CS ; RESET CS STATE
BCF PORTB,CLK ; RESET CLK STATE
BCF PORTB,DIO ; RESET DIO STATE
MOV LW WRCFG
TRIS PORTB ; DIO = OUTPUT
GOTO $+1 ; WAIT FOR OUTPUTS TO SETTLE
BSF PORTB,CS ; SELECT EEPROM
SETC ; START BIT = 1
MOV LW 9D ; START BIT + 8 DATA BITS
MOV WF CNT1
SENDC2
SKPC ; TEST BIT
BCF PORTB,DIO ; WRITE TO DIO
SKPNC ; TEST BIT
BSF PORTB,DIO ; WRITE TO DIO
GOTO $+1 ; WAIT 2 US
RLF OUTBYT,F ; GET NEXT BIT INTO CARRY
BSF PORTB,CLK ; CLOCK HIGH
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本文关键字：源程序 PIC单片机，单片机-工控设备 - PIC单片机
