R8C13 datasheet(80/224 Pages) RENESAS

80 / 224 page

Rev.1.20

Jan 27, 2006

page 69 of 205

REJ09B0111-0120

R8C/13 Group

11. Watchdog Timer

Watchdog timer start register

Symbol

Address

After reset

WDTS

000E16

Indeterminate

Function

The watchdog timer starts counting after a write instruction to this register.

Watchdog timer reset register

Symbol

Address

After reset

WDTR

000D16

Indeterminate

Function

The watchdog is initialized after a write instruction to this register.

The watchdog timer value is always initialized to “7FFF16” regardless of

whatever value is written.

Figure 11.2 OFS, WDC, WDTR and WDTS Registers

Watchdog timer control register

Symbol

Address

After reset

WDC

000F16

000111112

Function

Bit symbol

High-order bit of watchdog timer

WDC7

Bit name

Prescaler select bit

0 : Divided by 16

1 : Divided by 128

Reserved bit

Must set to “0”

(b4-b0)

(b6)

(b5)

Reserved bit

Must set to “0”

Option function select register(1)

SymbolAddress

Before shipment

OFS

0FFFF16

FF16

Function

Bit symbol

b7b6b5b4b3b2b1b0

Watchdog timer

start select bit

Bit name

WDTON

(b7 - b1)

Reserved bit

Set to “1”

1 1 11 1

0: The watchdog timer starts automatically after reset

1: The watchdog timer is inactive after reset

NOTES:

1. The OFS register can not be changed in a program. Set using a flash writer.

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