DM163006 datasheet(211/320 Pages) MICROCHIP

211 / 320 page

 2001 Microchip Technology Inc.

Advance Information

DS39541A-page 211

PIC18C601/801

19.2.2

WDT POSTSCALER

The WDT has a postscaler that can extend the WDT

Reset period. The postscaler may be programmed by

the user software or is selected by configuration bits

WDTPS<2:0> in the CONFIG2H register. If the device

has the Watchdog Timer enabled by configuration bits,

the device will use predefined set postscaler value. If

the device has the Watchdog Timer disabled by config-

uration bits, user software can set desired postscaler

value. When the device has the Watchdog Timer

enabled by configuration bits, by default, Watchdog

postscaler of 1:128 is selected.

FIGURE 19-1:

Watchdog Timer Block Diagram

TABLE 19-2:

SUMMARY OF WATCHDOG TIMER REGISTERS

Postscaler

WDT Timer

8 - to - 1 MUX

WDTPS2:WDTPS0

WDT

Time-out

SWDTEN bit

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

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

CONFIG2H

—

WDTPS2

WDTPS1

WDTPS0

WDTEN

RCON

IPEN

—

POR

WDTCON

—

SWDPS2

SWDPS1

SWDPS0

SWDTEN

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

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