4553 datasheet(82/145 Pages) RENESAS

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Skip condition

Number of

cycles

Number of

words

Instruction

code

Flag CY

Skip condition

Number of

cycles

Number of

words

Instruction

code

Flag CY

Skip condition

Number of

cycles

Number of

words

Instruction

code

Flag CY

Skip condition

Number of

cycles

Number of

words

Instruction

code

Flag CY

Rev.3.02

Dec 22, 2006

page 82 of 142

REJ03B0024-0302

4553 Group

CRCK (Clock select: Rc oscillation ClocK)

1010011011

29B

–

Grouping:

Clock control operation

Description: Selects the RC oscillation circuit for main

clock f(XIN).

Operation:

RC oscillation circuit selected

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

DI (Disable Interrupt)

0000000100

–

Grouping:

Interrupt control operation

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

disables the interrupt.

Note:

Interrupt is disabled by executing the DI in-

struction after executing 1 machine cycle.

Operation:

(INTE)

← 0

DWDT (Disable WatchDog Timer)

1010011100

–

Grouping:

Other operation

Description: Stops the watchdog timer function by the

WRST instruction after executing the

DWDT instruction.

Operation:

Stop of watchdog timer function enabled

0000010111

017

–

(Y) = 15

Grouping:

RAM addresses

Description: Subtracts 1 from the contents of register Y.

As a result of subtraction, when the con-

tents of register Y is 15, the next instruction

is skipped. When the contents of register Y

is not 15, the next instruction is executed.

Operation:

(Y)

← (Y) – 1

DEY (DEcrement register Y)

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