Microchip Technology MA320002 Data Sheet
© 2011 Microchip Technology Inc.
DS61143H-page 137
PIC32MX3XX/4XX
26.2
Watchdog Timer (WDT)
This section describes the operation of the WDT and
Power-Up Timer of the PIC32MX3XX/4XX.
Power-Up Timer of the PIC32MX3XX/4XX.
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.
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:
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
Wake
WDTCLR = 1
WDT Enable
LPRC
Power Save
25-bit Counter
PWRT Enable
WDT Enable
LPRC
WDT Counter Reset
Control
Oscillator
25
Device Reset
NMI (Wake-up)
PWRT
PWRT Enable
FWDTPS<4:0>(DEVCFG1<20:16>)
Clock
Decoder
1
1:64 Output
0
1
WDT Enable
Reset Event