HD64F36022 datasheet(194/384 Pages) RENESAS

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Section 12 Watchdog Timer

Rev. 4.00 Sep. 23, 2005 Page 168 of 354

REJ09B0025-0400

12.2

The watchdog timer has the following registers.

• Timer control/status register WD (TCSRWD)

• Timer counter WD (TCWD)

• Timer mode register WD (TMWD)

12.2.1

Timer Control/Status Register WD (TCSRWD)

TCSRWD performs the TCSRWD and TCWD write control. TCSRWD also controls the

watchdog timer operation and indicates the operating state. TCSRWD must be rewritten by using

the MOV instruction. The bit manipulation instruction cannot be used to change the setting value.

Bit

Bit Name

Initial

Value

R/W

Description

B6WI

R/W

Bit 6 Write Inhibit

The TCWE bit can be written only when the write value of

the B6WI bit is 0.

This bit is always read as 1.

TCWE

R/W

Timer Counter WD Write Enable

TCWD can be written when the TCWE bit is set to 1.

When writing data to this bit, the value for bit 7 must be 0.

B4WI

R/W

Bit 4 Write Inhibit

The TCSRWE bit can be written only when the write

value of the B4WI bit is 0. This bit is always read as 1.

TCSRWE

R/W

Timer Control/Status Register WD Write Enable

The WDON and WRST bits can be written when the

TCSRWE bit is set to 1.

When writing data to this bit, the value for bit 5 must be 0.

B2WI

R/W

Bit 2 Write Inhibit

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

write value of the B2WI bit is 0.

This bit is always read as 1.

HD64F36022 Datasheet(PDF) 194 Page - Renesas Technology Corp

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