4559 datasheet(119/148 Pages) RENESAS

119 / 148 page

Rev.1.04

Aug 23, 2007

Page 119 of 146

REJ03B0188-0104

4559 Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

TW3A

(Transfer data to register W3 from Accumulator)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

001

00 2 21 0 16

Opera-

tion:

(W3)

← (A)

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

Number of

words

Number of

cycles

Flag CY

Skip condition

001

01 2 21 1 16

Opera-

tion:

(W4)

← (A)

Grouping:

Timer operation

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

W4.

TYA

(Transfer data to register Y from Accumulator)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

000

00 2 00 C 16

Opera-

tion:

(Y)

← (A)

Grouping:

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

WRST

(Watchdog timer ReSeT)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

010

00 2 2A0 16

(WDF1) = 1

Opera-

tion:

(WDF1) = 1 ?

(WDF1)

← 0

Grouping:

Other operation

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

when watchdog timer flag WDF1 is “1”. When the WDF1

flag is “0”, executes the next instruction. Also, stops the

watchdog timer function when executing the WRST

instruction immediately after the DWDT instruction.

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