Datasheet

 2013-2015 Microchip Technology Inc. DS40001723D-page 87
PIC12(L)F1571/2
9.0 WATCHDOG TIMER (WDT)
The Watchdog Timer is a system timer that generates
a Reset if the firmware does not issue a CLRWDT
instruction within the time-out period. The Watchdog
Timer is typically used to recover the system from
unexpected events.
The WDT has the following features:
• Independent clock source
• Multiple operating modes:
- WDT is always on
- WDT is off when in Sleep
- WDT is controlled by software
- WDT is always off
• Configurable time-out period is from 1 ms to
256 seconds (nominal)
• Multiple Reset conditions
• Operation during Sleep
FIGURE 9-1: WATCHDOG TIMER BLOCK DIAGRAM
WDTE<1:0> = 01
SWDTEN
WDTE<1:0> = 11
WDTE<1:0> = 10
23-%it Programmable
Prescaler WDT
LFINTOSC
WDTPS<4:0>
WDT
Time-out
Sleep
Rev. 10-000141A
7/30/2013