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PIC18LF4331-E/ML Datasheet(PDF) 135 Page - Microchip Technology |
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PIC18LF4331-E/ML Datasheet(HTML) 135 Page - Microchip Technology |
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135 / 392 page  2010 Microchip Technology Inc. DS39616D-page 135 PIC18F2331/2431/4331/4431 EXAMPLE 13-1: IMPLEMENTING A REAL-TIME CLOCK USING A TIMER1 INTERRUPT SERVICE TABLE 13-2: REGISTERS ASSOCIATED WITH TIMER1 AS A TIMER/COUNTER Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Reset Values on Page: INTCON GIE/GIEH PEIE/GIEL TMR0IE INT0IE RBIE TMR0IF INT0IF RBIF 54 PIR1 — ADIF RCIF TXIF SSPIF CCP1IF TMR2IF TMR1IF 57 PIE1 — ADIE RCIE TXIE SSPIE CCP1IE TMR2IE TMR1IE 57 IPR1 — ADIP RCIP TXIP SSPIP CCP1IP TMR2IP TMR1IP 57 TMR1L Timer1 Register Low Byte 55 TMR1H Timer1 Register High Byte 55 T1CON RD16 T1RUN T1CKPS1 T1CKPS0 T1OSCEN T1SYNC TMR1CS TMR1ON 55 Legend: — = unimplemented, read as ‘0’. Shaded cells are not used by the Timer1 module. RTCinit MOVLW 0x80 ; Preload TMR1 register pair MOVWF TMR1H ; for 1 second overflow CLRF TMR1L MOVLW b'00001111' ; Configure for external clock, MOVWF T1CON ; Asynchronous operation, external oscillator CLRF secs ; Initialize timekeeping registers CLRF mins ; MOVLW .12 MOVWF hours BSF PIE1, TMR1IE ; Enable Timer1 interrupt RETURN RTCisr BSF TMR1H, 7 ; Preload for 1 sec overflow BCF PIR1, TMR1IF ; Clear interrupt flag INCF secs, F ; Increment seconds MOVLW .59 ; 60 seconds elapsed? CPFSGT secs RETURN ; No, done CLRF secs ; Clear seconds INCF mins, F ; Increment minutes MOVLW .59 ; 60 minutes elapsed? CPFSGT mins RETURN ; No, done CLRF mins ; clear minutes INCF hours, F ; Increment hours MOVLW .23 ; 24 hours elapsed? CPFSGT hours RETURN ; No, done MOVLW .01 ; Reset hours to 1 MOVWF hours RETURN ; Done |
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