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PIC18F6410E/PTSQTP Datasheet(PDF) 153 Page - Microchip Technology |
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PIC18F6410E/PTSQTP Datasheet(HTML) 153 Page - Microchip Technology |
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153 / 404 page  2004 Microchip Technology Inc. Preliminary DS39635A-page 151 PIC18F6310/6410/8310/8410 EXAMPLE 12-1: IMPLEMENTING A REAL-TIME CLOCK USING A TIMER1 INTERRUPT SERVICE TABLE 12-2: REGISTERS ASSOCIATED WITH TIMER1 AS A TIMER/COUNTER RTCinit MOVLW 80h ; Preload TMR1 register pair MOVWF TMR1H ; for 1 second overflow CLRF TMR1L MOVLW b’00001111’ ; Configure for external clock, MOVWF T1OSC ; 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 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 57 PIR1 PSPIF ADIF RC1IF TX1IF SSPIF CCP1IF TMR2IF TMR1IF 59 PIE1 PSPIE ADIE RC1IE TX1IE SSPIE CCP1IE TMR2IE TMR1IE 59 IPR1 PSPIP ADIP RC1IP TX1IP SSPIP CCP1IP TMR2IP TMR1IP 59 TMR1L Holding Register for the Least Significant Byte of the 16-bit TMR1 Register 58 TMR1H Holding Register for the Most Significant Byte of the 16-bit TMR1 Register 58 T1CON RD16 T1RUN T1CKPS1 T1CKPS0 T1OSCEN T1SYNC TMR1CS TMR1ON 58 Legend: — = unimplemented, read as ‘0’. Shaded cells are not used by the Timer1 module. |
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