H838024 datasheet(345/697 Pages) RENESAS

345 / 697 page

Section 9 Timers

Rev. 7.00 Mar 10, 2005 page 303 of 652

REJ09B0042-0700

9.6.2

Timer Control/Status Register W (TCSRW)

Bit

Initial value

Read/Write

B6WI

TCWE

(R/W)*1

B4WI

TCSRWE

(R/W)*1

B2WI

WRST

(R/W)*1

WDON

0/1*2

(R/W)*1

B0WI

Notes: 1. Write is enabled only under certain conditions, which are given in the descriptions

of the individual bits.

2. Initial value is 0 on H8/38024, H8/38024S, and H8/38024R Group; initial value

is 1 on H8/38124 Group.

TCSRW is an 8-bit read/write register that controls write access to TCW and TCSRW itself,

controls watchdog timer operations, and indicates operating status.

Bit 7—Bit 6 Write Disable (B6WI)

Bit 7 controls the writing of data to bit 6 in TCSRW.

Bit 7

B6WI

Description

Bit 6 is write-enabled

Bit 6 is write-protected

(initial value)

This bit is always read as 1. Data written to this bit is not stored.

Bit 6—Timer Counter W Write Enable (TCWE)

Bit 6 controls the writing of data to TCW.

Bit 6

TCWE

Description

Data cannot be written to TCW

(initial value)

Data can be written to TCW

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