4559 datasheet(95/148 Pages) RENESAS

95 / 148 page

Rev.1.04

Aug 23, 2007

Page 95 of 146

REJ03B0188-0104

4559 Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

POF

(Power OFf)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

000

10 2 00 2 16

Opera-

tion:

Transition to clock operating mode

Grouping:

Other operation

Description: Puts the system in clock operating mode by executing the

POF2 instruction after executing the EPOF instruction.

Note:

If the EPOF instruction is not executed just before this

instruction, this instruction is equivalent to the NOP instruc-

tion.

POF2

(Power OFf2)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

000

00 2 00 8 16

Opera-

tion:

Transition to RAM back-up mode

Grouping:

Other operation

Description: Puts the system in RAM back-up state by executing the

POF2 instruction after executing the EPOF instruction.

Note:

If the EPOF instruction is not executed before executing

this instruction, this instruction is equivalent to the NOP

instruction.

RAR

(Rotate Accumulator Right)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

001

01 2 01 D 16

0/1

Opera-

tion:

Grouping:

Arithmetic operation

Description: Rotates 1 bit of the contents of register A including the con-

tents of carry flag CY to the right.

RB j

(Reset Bit)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

100

+j 16

Opera-

tion:

(Mj(DP))

← 0

j = 0 to 3

Grouping:

Bit operation

Description: Clears (0) the contents of bit j (bit specified by the value j in

the immediate field) of M(DP).

A3A2A1A0

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