4556 datasheet(79/145 Pages) RENESAS

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Flag CY

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Number of

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Instruction

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Flag CY

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Flag CY

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Flag CY

Rev.3.02

Dec 22, 2006

page 79 of 142

REJ03B0025-0302

4556 Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET)

A n (Add n and accumulator)

000110nnnn

06n

–

Overflow = 0

Grouping:

Arithmetic operation

Description: Adds the value n in the immediate field to

The contents of carry flag CY remains unchanged.

Skips the next instruction when there is no

overflow as the result of operation.

Executes the next instruction when there is

overflow as the result of operation.

Operation:

(A)

← (A) + n

n = 0 to 15

AM (Add accumulator and Memory)

0000001010

00A

–

Grouping:

Arithmetic operation

Description: Adds the contents of M(DP) to register A.

Stores the result in register A. The contents

of carry flag CY remains unchanged.

Operation:

(A)

← (A) + (M(DP))

AMC (Add accumulator, Memory and Carry)

0000001011

00B

0/1

–

Grouping:

Arithmetic operation

Description: Adds the contents of M(DP) and carry flag

CY to register A. Stores the result in regis-

ter A and carry flag CY.

Operation:

(A)

← (A) + (M(DP)) + (CY)

(CY)

← Carry

AND (logical AND between accumulator and memory)

0000011000

018

––

Grouping:

Arithmetic operation

Description: Takes the AND operation between the con-

tents of register A and the contents of

M(DP), and stores the result in register A.

Operation:

(A)

← (A) AND (M(DP))

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