H8SSLASH2240 datasheet(431/818 Pages) RENESAS

部件名	H8S/2240

功能描述	Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series

PDF	818 Pages

Scroll/Zoom	100%

制造商	RENESAS [Renesas Technology Corp]

网页	http://www.renesas.com

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431 / 818 page

Section 11 Watchdog Timer

Rev.3.00 Mar. 26, 2007 Page 389 of 772

REJ09B0355-0300

11.1.3

Pin Configuration

Table 11.1 describes the WDT output pin.

Table 11.1

WDT Pin

Name

Symbol

I/O

Function

Watchdog timer overflow

WDTOVF

Output

Outputs counter overflow signal in watchdog

timer mode

11.1.4

The WDT has three registers, as summarized in table 11.2. These registers control clock selection,

WDT mode switching, and the reset signal.

Table 11.2

WDT Registers

Address*

Name

Abbreviation

R/W

Initial Value

Write*

Read

Timer control/status register

TCSR

R/(W)*

H'18

H'FFBC

Timer counter

TCNT

R/W

H'00

H'FFBC

H'FFBD

Reset control/status register

RSTCSR

R/(W)*

H'1F

H'FFBE

H'FFBF

Notes: 1. Lower 16 bits of the address.

2. For details of write operations, see section 11.2.4, Notes on Register Access.

3. Only a write of 0 is permitted to bit 7, to clear the flag.

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