HD64F36022 datasheet(195/384 Pages) RENESAS

Part #	HD64F36022

Description	Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

PDF	384 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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Section 12 Watchdog Timer

Rev. 4.00 Sep. 23, 2005 Page 169 of 354

REJ09B0025-0400

Bit

Bit Name

Initial

Value

R/W

Description

WDON

R/W

Watchdog Timer On

TCWD starts counting up when WDON is set to 1 and

halts when WDON is cleared to 0.

[Setting condition]

When 1 is written to the WDON bit while writing 0 to the

B2WI bit when the TCSRWE bit=1

[Clearing condition]

• Reset by RES pin

• When 0 is written to the WDON bit while writing 0 to

the B2WI when the TCSRWE bit=1

B0WI

R/W

Bit 0 Write Inhibit

This bit can be written to the WRST bit only when the

write value of the B0WI bit is 0. This bit is always read as

WRST

R/W

Watchdog Timer Reset

[Setting condition]

When TCWD overflows and an internal reset signal is

generated

[Clearing condition]

• Reset by RES pin

• When 0 is written to the WRST bit while writing 0 to

the B0WI bit when the TCSRWE bit=1

12.2.2

Timer Counter WD (TCWD)

TCWD is an 8-bit readable/writable up-counter. When TCWD overflows from H'FF to H'00, the

internal reset signal is generated and the WRST bit in TCSRWD is set to 1. TCWD is initialized to

H'00.

HD64F36022 Datasheet(PDF) 195 Page - Renesas Technology Corp

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