4559 Datasheet, PDF(90/148 Page) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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4559 Datasheet, PDF (90/148 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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4559 Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

CRCK (Clock select: Rc oscillation ClocK)

Instruc-

tion

code

1 0 1 0 0 1 1 0 1 1 2 2 9 B 16

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- RC oscillation circuit selected

tion:

Grouping: Clock control operation

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

DEY (DEcrement register Y)

Instruc-

tion

code

0 0 0 0 0 1 0 1 1 1 2 0 1 7 16

Number of

words

Number of

cycles

Flag CY

Skip condition

(Y) = 15

Opera- (Y) â (Y) â1

tion:

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

DI (Disable Interrupt)

Instruc-

tion

code

0 0 0 0 0 0 0 1 0 0 2 0 0 4 16

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- (INTE) â 0

tion:

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

1 0 1 0 0 1 1 1 0 0 2 2 9 C 16

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- Stop of watchdog timer function enabled

tion:

Grouping: Other operation

Description: Stops the watchdog timer function by the WRST instruction

after executing the DWDT instruction.

Rev.1.04 Aug 23, 2007 Page 90 of 146

REJ03B0188-0104

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