PIC18F020 datasheet(91/176 Pages) MICROCHIP

91 / 176 page

 2001 Microchip Technology Inc.

Preliminary

DS41142A-page 89

PIC18F010/020

12.2.2

WDT POSTSCALER

The WDT has a postscaler that can extend the WDT

Reset period. The postscaler is selected at the time of

the device programming, by the value written to the

CONFIG2H configuration register. An extended WDT

is also available, multiplying the standard settings by

16.

The standard settings are also available in software

when not setup in the CONFIG2H configuration. The

WDTCON register allows enabling the WDT and set-

ting the standard postscaler options.

FIGURE 12-1:

WATCHDOG TIMER BLOCK DIAGRAM

TABLE 12-2:

SUMMARY OF WATCHDOG TIMER REGISTERS

Note:

The WDTCON register must be unlocked

before

can

modified

(see

Section 12.4.1).

Postscaler

WDT Timer

WDTEN

8 - to - 1 MUX

WDTPS2:WDTPS0

WDT

Time-out

SWDTEN bit

Note: WDPS2:WDPS0 are bits in a configuration register.

Configuration bit

÷ 16

WDTLE

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

CONFIG2H

reserved

—

STVRE

WDTLE

WDTPS2

WDTPS0

WDTEN

RCON

IPEN

—

POR

BOR

WDTCON

—

SWDTEN

Legend: Shaded cells are not used by the Watchdog Timer.

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