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2 hardware watchdog timer duration register – FUJITSU MB91460 SERIES FR60 User Manual

Page 302

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Chapter 21 Hardware Watchdog Timer

3.Register

3.2 Hardware watchdog timer duration register

Hardware watchdog timer duration register (elongation of the trigger duration).

• HWWDE: Address 04C6h (Access: Byte)

(See “

Meaning of Bit Attribute Symbols (Page No.10)

” for details of the attributes.)

• Bit7-2: Reserved bits. Always write “0” to these bits.

• Bit1-0: ED (Elongate watchdog duration).

*) This setting is not available on MB91V460.

7

6

5

4

3

2

1

0

bit

-

-

-

-

-

-

ED1

ED0

-

-

-

-

-

-

0

0

Initial value (

INIT pin input,

watchdog reset

)

-

-

-

-

-

-

0

0

Initial value

(Software reset)

RX/W0

RX/W0

RX/W0

RX/W0

RX/W0

RX/W0

R/W

R/W

Attribute

ED1-0

Function

00

The watchdog period is 2^16 RC clock cycles [initial setting]

01

The watchdog period is 2^17 RC clock cycles *)

10

The watchdog period is 2^18 RC clock cycles *)

11

The watchdog period is 2^19 RC clock cycles *)