PIC16F753 Datasheet, PDF (175/238 Pages) Microchip Technology – 14/16-Pin, Flash-Based 8-Bit CMOS Microcontrollers

PIC16F753/HV753
19.6.2 WDT PROGRAMMING
CONSIDERATIONS
It should also be taken in account that under worst-
case conditions (i.e., VDD = Min., Temperature = Max.,
Max. WDT prescaler) it may take several seconds
before a WDT time-out occurs.
FIGURE 19-9:
WATCHDOG TIMER WITH SHARED PRESCALE BLOCK DIAGRAM
FOSC/4
T0CKI
pin
T0SE
0
1
T0CS
Shared Prescale
0
1
PSA
8-bit
Prescaler
8
1
0
PSA
Sync
2 TCY
Data Bus
8
TMR0
Set Flag bit T0IF
on Overflow
LFINTOSC
(Figure 4-1)
Watchdog
Timer
2
PSA
WDTE
PS<2:0>
1
0
PSA
WDT
Time-out
Note 1: T0SE, T0CS, PSA, PS<2:0> are bits in the OPTION_REG register.
2: WDTE bit is in the Configuration Word register.
TABLE 19-7: WDT STATUS
WDTE = 0
CLRWDT Command
Exit Sleep
Conditions
WDT
Cleared
 2013 Microchip Technology Inc.
Preliminary
DS40001709A-page 175