M34286G2GP datasheet(7/66 Pages) RENESAS

7 / 66 page

Rev.1.00

Aug 06, 2008

page 7 of 64

REJ03B0251-0100

4286 Group

Fig. 1 AMC instruction execution example

Fig. 2 RAR instruction execution example

Fig. 3 Registers A, B and register E

FUNCTION BLOCK OPERATIONS

CPU

(1) Arithmetic logic unit (ALU)

The arithmetic logic unit ALU performs 4-bit arithmetic such

as 4-bit data addition, comparison, and bit manipulation.

(2) Register A and carry flag

exchange, and I/O operation.

Carry flag CY is a 1-bit flag that is set to “1” when there is a

carry with the AMC instruction (Figure 1).

It is unchanged with both A n instruction and AM instruction.

The value of A0 is stored in carry flag CY with the RAR

instruction (Figure 2).

Carry flag CY can be set to “1” with the SC instruction and

cleared to “0” with the RC instruction.

(3) Registers B and E

bit data, and for 8-bit data transfer together with register A.

transfer with register B used as the high-order 4 bits and

(4) Register D

It is used to store a 7-bit ROM address together with register

A and is used as a pointer within the specified page when the

TABP p, BLA p, or BMLA p instruction is executed (Figure 4).

Fig. 4 TABP p instruction execution example

(CY)

(M(DP))

(A)

Addition

ALU

<Carry>

A3 A2 A1 A0

CY A3 A2 A1

RAR instruction

<Set>

SC instruction

<Clear>

RC instruction

A3 A2 A1 A0

B3 B2 B1 B0

ER7ER6ER5ER4ER3ER2ER1ER0

A3 A2 A1 A0

B3 B2 B1 B0

TAB instruction

TEAB instruction

TABE instruction

TBA instruction

Specifying address

p3 p2 p1 p0

PCH

DR2 DR1 DR0 A3 A2 A1 A0

PCL

Immediate field

value p

The contents

of register D

The contents

of register A

ROM

TABP p instruction

Low-order 4 bits

Middle-order 4 bits

Most significant 1 bit

URS flag (1)

URSC instruction

Carry flag CY (1)

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