PIC16F88

Manufacturer Part NumberPIC16F88
ManufacturerMicrochip Technology Inc.
PIC16F88 datasheet
 
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Page 79/228:

Value on

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EXAMPLE 7-3:
IMPLEMENTING A REAL-TIME CLOCK USING A TIMER1 INTERRUPT SERVICE
RTCinit
BANKSEL
TMR1H
MOVLW
0x80
MOVWF
TMR1H
CLRF
TMR1L
MOVLW
b’00001111’
MOVWF
T1CON
CLRF
secs
CLRF
mins
MOVLW
.12
MOVWF
hours
BANKSEL
PIE1
BSF
PIE1, TMR1IE
RETURN
RTCisr
BANKSEL
TMR1H
BSF
TMR1H, 7
BCF
PIR1, TMR1IF
INCF
secs, F
MOVF
secs, w
SUBLW
.60
BTFSS
STATUS, Z
RETURN
CLRF
seconds
INCF
mins, f
MOVF
mins, w
SUBLW
.60
BTFSS
STATUS, Z
RETURN
CLRF
mins
INCF
hours, f
MOVF
hours, w
SUBLW
.24
BTFSS
STATUS, Z
RETURN
CLRF
hours
RETURN
TABLE 7-2:
REGISTERS ASSOCIATED WITH TIMER1 AS A TIMER/COUNTER
Address
Name
Bit 7
Bit 6
0Bh, 8Bh,
INTCON
GIE
PEIE
TMR0IE
10Bh, 18Bh
(1)
0Ch
PIR1
ADIF
RCIF
(1)
8Ch
PIE1
ADIE
RCIE
0Eh
TMR1L
Holding Register for the Least Significant Byte of the 16-bit TMR1 Register
0Fh
TMR1H Holding Register for the Most Significant Byte of the 16-bit TMR1 Register
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.
 2005 Microchip Technology Inc.
; Preload TMR1 register pair
; for 1 second overflow
; Configure for external clock,
; Asynchronous operation, external oscillator
; Initialize timekeeping registers
; Enable Timer1 interrupt
; Preload for 1 sec overflow
; Clear interrupt flag
; Increment seconds
; 60 seconds elapsed?
; No, done
; Clear seconds
; Increment minutes
; 60 seconds elapsed?
; No, done
; Clear minutes
; Increment hours
; 24 hours elapsed?
; No, done
; Clear hours
; Done
Bit 5
Bit 4
Bit 3
Bit 2
INT0IE
RBIE
TMR0IF
TXIF
SSPIF
CCP1IF
TXIE
SSPIE
CCP1IE TMR2IE
PIC16F87/88

Value on

Value on

Bit 1
Bit 0
all other
POR, BOR
Resets
INT0IF
RBIF
0000 000x 0000 000u
TMR2IF
TMR1IF -000 0000 -000 0000
TMR1IE -000 0000 -000 0000
xxxx xxxx uuuu uuuu
xxxx xxxx uuuu uuuu
DS30487C-page 77