455A datasheet(91/148 Pages) RENESAS

91 / 148 page

Rev.1.01

Feb 15, 2008

Page 91 of 146

REJ03B0224-0101

455A Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

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

DI (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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