PIC16F676-I Datasheet, PDF (69/132 Pages) Microchip Technology – 14-Pin, Flash-Based 8-Bit CMOS Microcontrollers

PIC16F630/676
FIGURE 9-12:
CLKOUT
(= FOSC/4)
T0CKI
pin
T0SE
WATCHDOG TIMER BLOCK DIAGRAM
0
1
0
T0CS
1
PSA
8-bit
Prescaler
8
1
SYNC 2
Cycles
0
PSA
Watchdog
Timer
PS0 - PS2
1
0
WDTE
PSA
Note 1: T0SE, T0CS, PSA, PS0-PS2 are bits in the OPTION register.
WDT
Time-out
Data Bus
8
TMR0
Set Flag bit T0IF
on Overflow
TABLE 9-9: SUMMARY OF WATCHDOG TIMER REGISTERS
Address
Name
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
Bit 0
Value on
POR, BOD
Value on all
other
Resets
81h
OPTION_REG RAPU INTEDG T0CS T0SE PSA PS2 PS1 PS0 1111 1111 1111 1111
2007h Config. bits
CP BODEN MCLRE PWRTE WDTE F0SC2 F0SC1 F0SC0 uuuu uuuu uuuu uuuu
Legend: u = Unchanged, shaded cells are not used by the Watchdog Timer.
 2010 Microchip Technology Inc.
DS40039F-page 69