4571 Datasheet, PDF(79/126 Page) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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4571 Datasheet, PDF (79/126 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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4571 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- RAM back-up

tion:

Grouping: Other operation

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

POF 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.

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

contents 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).

RBK (Reset BanK flag))

Instruc-

tion

code

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

Number of

words

Number of

cycles

Flag CY

Skip condition

Opera- p6 â 0 when TABP p instruction is executed.

tion:

Grouping: Other operation

Description: Sets referring data area to pages 0 to 63 when the TABP p

instruction is executed. This instruction is valid only for the

TABP p instruction.

Note:

This instruction cannot be used for the M34571G4/G6.

Rev.1.02 May 25, 2007 Page 79 of 124

REJ03B0179-0102

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