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PIC18F4550ESOSQTP Datasheet(PDF) 135 Page - Microchip Technology |
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PIC18F4550ESOSQTP Datasheet(HTML) 135 Page - Microchip Technology |
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135 / 430 page  © 2007 Microchip Technology Inc. Preliminary DS39632D-page 133 PIC18F2455/2550/4455/4550 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 d’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 d’59’ ; 60 seconds elapsed? CPFSGT secs RETURN ; No, done CLRF secs ; Clear seconds INCF mins, F ; Increment minutes MOVLW d’59’ ; 60 minutes elapsed? CPFSGT mins RETURN ; No, done CLRF mins ; clear minutes INCF hours, F ; Increment hours MOVLW d’23’ ; 24 hours elapsed? CPFSGT hours RETURN ; No, done MOVLW d’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 51 PIR1 SPPIF(1) ADIF RCIF TXIF SSPIF CCP1IF TMR2IF TMR1IF 54 PIE1 SPPIE(1) ADIE RCIE TXIE SSPIE CCP1IE TMR2IE TMR1IE 54 IPR1 SPPIP(1) ADIP RCIP TXIP SSPIP CCP1IP TMR2IP TMR1IP 54 TMR1L Timer1 Register Low Byte 52 TMR1H TImer1 Register High Byte 52 T1CON RD16 T1RUN T1CKPS1 T1CKPS0 T1OSCEN T1SYNC TMR1CS TMR1ON 52 Legend: — = unimplemented, read as ‘0’. Shaded cells are not used by the Timer1 module. Note 1: These bits are unimplemented on 28-pin devices; always maintain these bits clear. |
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