4559 datasheet(90/148 Pages) RENESAS

90 / 148 page

Rev.1.04

Aug 23, 2007

Page 90 of 146

REJ03B0188-0104

4559 Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

CRCK

(Clock select: Rc oscillation ClocK)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

001

11 2 29 B 16

Opera-

tion:

RC oscillation circuit selected

Grouping:

Clock control operation

Description: Selects the RC oscillation circuit for main clock f(XIN).

DEY

(DEcrement register Y)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

001

11 2 01 7 16

(Y) = 15

Opera-

tion:

(Y)

← (Y) −1

Grouping:

RAM addresses

Description: Subtracts 1 from the contents of register Y.

As a result of subtraction, when the contents of register Y

is 15, the next instruction is skipped. When the contents of

(Disable Interrupt)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

000

00 2 00 4 16

Opera-

tion:

(INTE)

← 0

Grouping:

Interrupt control operation

Description: Clears (0) to interrupt enable flag INTE, and disables the

interrupt.

Note:

Interrupt is disabled by executing the DI instruction after

executing 1 machine cycle.

DWDT (Disable WatchDog Timer)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

001

00 2 29 C 16

Opera-

tion:

Stop of watchdog timer function enabled

Grouping:

Other operation

Description: Stops the watchdog timer function by the WRST instruction

after executing the DWDT instruction.

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