455A Datasheet, PDF(120/148 Page) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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455A Datasheet, PDF (120/148 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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455A Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

TW3A (Transfer data to register W3 from Accumulator)

Instruc-

tion

code

1 0 0 0 0 1 0 0 0 0 2 2 1 0 16

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- (W3) â (A)

tion:

Grouping: Timer operation

Description: Transfers the contents of register A to timer control register

W3.

TW4A (Transfer data to register W4 from Accumulator)

Instruc-

tion

code

1 0 0 0 0 1 0 0 0 1 2 2 1 1 16

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- (W4) â (A)

tion:

Grouping: Timer operation

Description: Transfers the contents of register A to timer control register

W4.

TW5A (Transfer data to register W5 from Accumulator)

Instruc-

tion

code

1 0 0 0 0 1 0 0 1 0 2 2 1 2 16

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- (W5) â (A)

tion:

Grouping: Timer operation

Description: Transfers the contents of register A to timer control register

W5.

TYA (Transfer data to register Y from Accumulator)

Instruc-

tion

code

0 0 0 0 0 0 1 1 0 0 2 0 0 C 16

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- (Y) â (A)

tion:

Grouping: Register to register transfer

Description: Transfers the contents of register A to register Y.

WRST (Watchdog timer ReSeT)

Instruc-

tion

code

1 0 1 0 1 0 0 0 0 0 2 2 A 0 16

Number of

words

Number of

cycles

Flag CY

Skip condition

(WDF1) = 1

Opera- (WDF1) = 1 ?

tion: (WDF1) â 0

Grouping: Other operation

Description: Clears (0) to the WDF1 flag and skips the next instruction

when watchdog timer flag WDF1 is â1â. When the WDF1

flag is â0â, executes the next instruction. Also, stops the

watchdog timer function when executing the WRST

instruction immediately after the DWDT instruction.

Rev.1.01 Feb 15, 2008 Page 120 of 146

REJ03B0224-0101

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