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PIC16F87 Datasheet(PDF) 77 Page - Microchip Technology |
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PIC16F87 Datasheet(HTML) 77 Page - Microchip Technology |
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77 / 230 page  2002-2013 Microchip Technology Inc. DS30487D-page 77 PIC16F87/88 EXAMPLE 7-3: IMPLEMENTING A REAL-TIME CLOCK USING A TIMER1 INTERRUPT SERVICE TABLE 7-2: REGISTERS ASSOCIATED WITH TIMER1 AS A TIMER/COUNTER RTCinit BANKSEL TMR1H 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 BANKSEL PIE1 BSF PIE1, TMR1IE ; Enable Timer1 interrupt RETURN RTCisr BANKSEL TMR1H BSF TMR1H, 7 ; Preload for 1 sec overflow BCF PIR1, TMR1IF ; Clear interrupt flag INCF secs, F ; Increment seconds MOVF secs, w SUBLW .60 BTFSS STATUS, Z ; 60 seconds elapsed? RETURN ; No, done CLRF seconds ; Clear seconds INCF mins, f ; Increment minutes MOVF mins, w SUBLW .60 BTFSS STATUS, Z ; 60 seconds elapsed? RETURN ; No, done CLRF mins ; Clear minutes INCF hours, f ; Increment hours MOVF hours, w SUBLW .24 BTFSS STATUS, Z ; 24 hours elapsed? RETURN ; No, done CLRF hours ; Clear hours RETURN ; Done Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Value on POR, BOR Value on all other Resets 0Bh, 8Bh, 10Bh, 18Bh INTCON GIE PEIE TMR0IE INT0IE RBIE TMR0IF INT0IF RBIF 0000 000x 0000 000u 0Ch PIR1 — ADIF(1) RCIF TXIF SSPIF CCP1IF TMR2IF TMR1IF -000 0000 -000 0000 8Ch PIE1 — ADIE(1) RCIE TXIE SSPIE CCP1IE TMR2IE TMR1IE -000 0000 -000 0000 0Eh TMR1L Holding Register for the Least Significant Byte of the 16-bit TMR1 Register xxxx xxxx uuuu uuuu 0Fh TMR1H Holding Register for the Most Significant Byte of the 16-bit TMR1 Register xxxx xxxx uuuu uuuu 10h T1CON — T1RUN T1CKPS1 T1CKPS0 T1OSCEN T1SYNC TMR1CS TMR1ON -000 0000 -uuu uuuu Legend: x = unknown, u = unchanged, - = unimplemented, read as ‘0’. Shaded cells are not used by the Timer1 module. Note 1: This bit is only implemented on the PIC16F88. The bit will read ‘0’ on the PIC16F87. |
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