PIC32MX5XX_11 Datasheet, PDF (173/256 Pages) Microchip Technology – High-Performance, USB, CAN and Ethernet 32-bit Flash Microcontrollers

PIC32MX5XX/6XX/7XX
28.2 Watchdog Timer (WDT)
This section describes the operation of the WDT and
Power-up Timer of the PIC32MX5XX/6XX/7XX.
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 28-1:
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>)
© 2009-2011 Microchip Technology Inc.
DS61156G-page 173