M34282M1 View Datasheet(PDF) - Renesas Electronics

Part Name

Description

Manufacturer

M34282M1

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

Renesas Electronics 

4282 Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET)

A n (Add n and accumulator)

Instrunction D8

D0

code

0 1 0 1 0 n3 n2 n1 n0

2

Number of Number of Flag CY

0 An

words

cycles

16

1

1

–

Skip condition

Overflow = 0

Operation:

(A) ← (A) + n

n = 0 to 15

Grouping: Arithmetic operation

Description: Adds the value n in the immediate field to

register A.

The contents of carry flag CY remains un-

changed.

Skips the next instruction when there is no

overflow as the result of operation.

AM (Add accumulator and Memory)

Instrunction D8

D0

code

000001010

2

Operation: (A) ← (A) + (M(DP))

Number of Number of Flag CY

00A

words

cycles

16

1

1

–

Skip condition

–

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)

Instrunction D8

D0

code

000001011

2

Operation:

(A) ← (A) + (M(DP)) + (CY)

(CY) ← Carry

Number of Number of Flag CY

00B

words

cycles

16

1

1

0/1

Skip condition

–

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.

B a (Branch to address a)

Instrunction D8

D0

code

1 1 a6 a5 a4 a3 a2 a1 a0

2

Operation: (PCL) ← a6–a0

Number of Number of Flag CY

1

8

+a

a

16

words

1

cycles

1

–

Skip condition

–

Grouping: Branch operation

Description: Branch within a page : Branches to address

a in the identical page.

Rev.1.33 Mar 18, 2004 page 27 of 67

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