4559 datasheet(87/148 Pages) RENESAS

87 / 148 page

Rev.1.04

Aug 23, 2007

Page 87 of 146

REJ03B0188-0104

4559 Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET)

A n

(Add n and accumulator)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

110

nn 2 06 n 16

Overflow = 0

Opera-

tion:

(A)

← (A) + n

n = 0 to 15

Grouping:

Arithmetic operation

Description: Adds the value n in the immediate field to register A, and

stores a result in register A.

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.

(Add accumulator and Memory)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

000

10 2 00 A 16

Opera-

tion:

(A)

← (A)Å{(M(DP))

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.

AMC

(Add accumulator, Memory and Carry)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

000

11 2 00 B 16

0/1

Opera-

tion:

(A)

← (A) + (M(DP)) + (CY)

(CY)

← Carry

Grouping:

Arithmetic operation

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

A. Stores the result in register A and carry flag CY.

AND

(logical AND between accumulator and memory)

Instruc-

tion

code

Number of

words

Number of

cycles

Flag CY

Skip condition

001

00 2 01 8 16

Opera-

tion:

(A)

← (A) AND (M(DP))

Grouping:

Arithmetic operation

Description: Takes the AND operation between the contents of register

A and the contents of M(DP), and stores the result in regis-

ter A.

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