The document details the LPC 176x/5x watchdog timer, an electronic timer designed to detect and recover from computer malfunctions by automatically resetting the system if not regularly serviced. It features a 32-bit programmable timer with multiple operating modes and conditions, and includes registers for configuration and operation. Its applications involve resetting microcontrollers during erroneous states and facilitating interaction with other peripherals.

1. LPC 176x/5x Watchdog
Timer
PRESENTED BY:-
SRISHTI KAKADE(BETB130)
VISHWAS BISEN(BETB302)
SHUBHAM PATIL(BETB310)

2. CONTENT
 INTRODUCTION
 FEATURES
 Block Diagram
 Registers in WDT
 Applications

3. INTRODUCTION
A watchdog timer is an electronic timer that
is used to detect and recover from computer malfunctions.
During normal operation, the computer regularly resets the
WDT. Automatically generates a system reset if the main
program neglects to periodically service it.

4. FEATURES
 32-bit programmable timer with internal pre-scalar.
 Debug mode.
 Independent Clock Source
 Multiple Operating Modes
◦ WDT Always On
◦ WDT Off in Sleep
◦ WDT Controlled by Software
◦ WDT Always Off
 Multiple Reset Conditions
 Operation During Sleep

5. REGISTER DISRIPTION:-
 The watchdog contain of 4 register.

6. Watchdog Mode Register

7. Watchdog Timer Constant
register

8. Watchdog Feed Register

9. Watchdog Timer Value Register

10. CLOCK SOURCE SELECT
REGISTER

11. Block Diagram

12. APPLICATION:-
 The purpose of the watchdog is to reset the
microcontroller within a reasonable amount of
time if it enters an erroneous state.
 When enabled ,the Watchdog will generate a
sytem reset if the user program fails to “feed”(or
reload) the watchdog within a predetermined
amount of time.
 it is also use for interaction of the on chip
watchdog and other peripherals.
 Detects the fault.