4559 Datasheet, PDF(95/148 Page) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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4559 Datasheet, PDF (95/148 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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4559 Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

POF (Power OFf)

Instruc-

tion

code

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

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- Transition to clock operating mode

tion:

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

0 0 0 0 0 0 1 0 0 0 2 0 0 8 16

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- Transition to RAM back-up mode

tion:

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

0 0 0 0 0 1 1 1 0 1 2 0 1 D 16

Number of

words

Number of

cycles

Flag CY

0/1

Skip condition

Opera-

tion:

CY A3A2A1A0

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

00010011

+j 16

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- (Mj(DP)) â 0

tion: 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).

Rev.1.04 Aug 23, 2007 Page 95 of 146

REJ03B0188-0104

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