M32CSLASH8A datasheet(136/372 Pages) RENESAS

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M32C/8A Group

12. Watchdog Timer

Rev.1.00

Jul 15, 2007

Page 119 of 352

REJ09B0385-0100

Figure 12.3

WDC Register, WDTS Register

b6 b5 b4

Watchdog Timer Control Register

Symbol

WDC

Address

000Fh

Bit Symbol

Bit Name

−

(b4-b0)

After Reset

00XX XXXXb

Function

WDC5

−

(b6)

Cold start/warm start determine

flag(1)

High-order bits of watchdog timer

WDC7

Reserved bit

Prescaler select bit

0: Cold start

1: Warm start

Set to 0

0: Divide-by-16

1: Divide-by-128

NOTES:

1. The WDC5 bit is 0 after power-on. It can be set to 1 only by program. The bit becomes 1 by writing either a 0 or 1.

The bit maintains a value set before reset, even after reset has been performed.

Watchdog Timer Start Register

Symbol

WDTS

Address

000Eh

Address

Undefined

Function

The counter is initialized and starts decrementing by a write instruction to the WDTS register.

7FFFh is the default value after initialization no matter what value is written.

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