PIC16F88-I/SO Microchip Technology Inc., PIC16F88-I/SO Datasheet - Page 79

• Manufacturer Part Number: PIC16F88-I/SO
• Description: 18 PIN, 7 KB FLASH, 368 RAM, 16 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F88-I/SO

• A/d Inputs: 7-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 5 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 16
• Interface: I2C/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 18-pin SOIC
• Programmable Memory: 7K Bytes
• Ram Size: 368 Bytes
• Speed: 20 MHz
• Timers: 2-8-bit, 1-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

EXAMPLE 7-3:
TABLE 7-2:
 2005 Microchip Technology Inc.
0Bh, 8Bh,
10Bh, 18Bh
0Ch
8Ch
0Eh
0Fh
10h
Legend:
Note 1:
RTCinit
RTCisr
Address
x = unknown, u = unchanged, - = unimplemented, read as ‘0’. Shaded cells are not used by the Timer1 module.
This bit is only implemented on the PIC16F88. The bit will read ‘0’ on the PIC16F87.
INTCON
PIR1
PIE1
TMR1L
TMR1H Holding Register for the Most Significant Byte of the 16-bit TMR1 Register
T1CON
Name
BANKSEL
MOVLW
MOVWF
CLRF
MOVLW
MOVWF
CLRF
CLRF
MOVLW
MOVWF
BANKSEL
BSF
RETURN
BANKSEL
BSF
BCF
INCF
MOVF
SUBLW
BTFSS
RETURN
CLRF
INCF
MOVF
SUBLW
BTFSS
RETURN
CLRF
INCF
MOVF
SUBLW
BTFSS
RETURN
CLRF
RETURN
REGISTERS ASSOCIATED WITH TIMER1 AS A TIMER/COUNTER
Holding Register for the Least Significant Byte of the 16-bit TMR1 Register
Bit 7
GIE
IMPLEMENTING A REAL-TIME CLOCK USING A TIMER1 INTERRUPT SERVICE
—
—
—
ADIE
T1RUN T1CKPS1 T1CKPS0 T1OSCEN T1SYNC TMR1CS TMR1ON -000 0000 -uuu uuuu
ADIF
TMR1H
0x80
TMR1H
TMR1L
b’00001111’
T1CON
secs
mins
.12
hours
PIE1
PIE1, TMR1IE
TMR1H
TMR1H, 7
PIR1, TMR1IF
secs, F
secs, w
.60
STATUS, Z
seconds
mins, f
mins, w
.60
STATUS, Z
mins
hours, f
hours, w
.24
STATUS, Z
hours
PEIE
Bit 6
(1)
(1)
TMR0IE
RCIF
RCIE
Bit 5
INT0IE
Bit 4
TXIF
TXIE
; 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
SSPIE
SSPIF
RBIE
Bit 3
TMR0IF
CCP1IE TMR2IE
CCP1IF
Bit 2
TMR2IF
INT0IF
Bit 1
PIC16F87/88
TMR1IF -000 0000 -000 0000
TMR1IE -000 0000 -000 0000
RBIF
Bit 0
0000 000x 0000 000u
xxxx xxxx uuuu uuuu
xxxx xxxx uuuu uuuu
POR, BOR
Value on
DS30487C-page 77
Value on
all other
Resets