PIC32MX1XX Datasheet, PDF (235/320 Pages) Microchip Technology – 32-bit Microcontrollers (up to 128 KB Flash and 32 KB SRAM) with Audio and Graphics Interfaces, USB, and Advanced Analog

PIC32MX1XX/2XX
26.2 Watchdog Timer (WDT)
This section describes the operation of the WDT and
Power-up Timer of the PIC32MX1XX/2XX.
The WDT, when enabled, operates from the internal
Low-Power Oscillator (LPRC) clock source and can be
used to detect system software malfunctions by reset-
ting the device if the WDT is not cleared periodically in
software. Various WDT time-out periods can be
selected using the WDT postscaler. The WDT can also
be used to wake the device from Sleep or Idle mode.
The following are some of the key features of the WDT
module:
• Configuration or software controlled
• User-configurable time-out period
• Can wake the device from Sleep or Idle
FIGURE 26-1:
WATCHDOG AND POWER-UP TIMER BLOCK DIAGRAM
PWRT Enable
WDT Enable
LPRC
Oscillator
WDTCLR = 1
WDT Enable
Wake
WDT Enable
Reset Event
Clock
1:64 Output
1
PWRT Enable
LPRC
Control
PWRT
25-bit Counter
25
WDT Counter Reset
0
Device Reset
1
NMI (Wake-up)
Power Save
Decoder
FWDTPS<4:0> (DEVCFG1<20:16>)
© 2011-2012 Microchip Technology Inc.
Preliminary
DS61168D-page 235