PIC16F15213 datasheet(98/408 Pages) MICROCHIP

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14.

WDT - Watchdog Timer

The Watchdog Timer (WDT) is a system timer that generates a Reset event if the firmware does not issue a CLRWDT

instruction within the time-out period. The Watchdog Timer is typically used to reset the processor in the event of a

software malfunction, but can also be used to wake the device when in Sleep mode.

The WDT has the following features:

• Selectable clock sources

• 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 from 1 ms to 256 seconds (nominal)

• Multiple Reset conditions

• Operation during Sleep

Figure 14-1. Watchdog Timer (WDT) Block Diagram

Filename:

WDT Block Diagram.vsdx

Title:

Last Edit:

1/23/2020

First Used:

Notes:

Rev. WDT Bloc k

1/23/2020

23-bit WDT Prescaler

Counter

PS[4:0]

WDT

Time-out

WDTE[1:0] =

SEN

WDTE[1:0] =

Sleep

WDTE[1:0] =

14.1

Selectable Clock Sources

The WDT can derive its time base from either the 31.25 kHz MFINTOSC or the 31 kHz LFINTOSC as selected by the

WDT Clock Source Select (CS) bit.

Important: Time intervals detailed in this chapter are based on a minimum nominal interval of 1 ms

generated from the LFINTOSC clock source.

14.2

WDT Operating Modes

The WDT module has four operating modes controlled by the Watchdog Timer Enable (WDTE) bits. See Table 14-1.

Table 14-1. WDT Operating Modes

WDTE[1:0]

SEN

Device Mode

WDT Mode

Active

PIC16F15225/45

WDT - Watchdog Timer

Preliminary Datasheet

DS20006389B-page 98

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