PIC16F/LF1946/47
10.0 WATCHDOG TIMER
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 (typical)
• Multiple Reset conditions
• Operation during Sleep
FIGURE 10-1:
WATCHDOG TIMER BLOCK DIAGRAM
WDTE<1:0> = 01
SWDTEN
23-bit Programmable
WDT Time-out
WDTE<1:0> = 11
LFINTOSC
Prescaler WDT
WDTE<1:0> = 10
Sleep
WDTPS<4:0>
2010 Microchip Technology Inc.
Preliminary
DS41414A-page 103
MICROCHIP [ MICROCHIP ]
