UPD75236GJ データシートの表示（PDF） - NEC => Renesas Technology

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UPD75236GJ

4-BIT SINGLE-CHIP MICROCOMPUTER

NEC => Renesas Technology 

µPD75236

3.4 GENERAL REGISTER: 8 × 4 BITS × 4 BANKS

The general registers are mapped at the special addresses of the data memory. There are 4-bank registers,

each bank consisting of eight 4-bit registers (B, C, D, E, H, L, X, A).

The register bank (RB) which becomes valid for instruction is given as

RB = RBE• RBS

(RBS = 0 to 3).

Each general register is operated in 4-bit units. BC, DE, HL and XA form register pairs and are used for 8-bit

manipulation. In addition to DE and HL, DL also makes up a pair and these three pairs can be used as a data

pointer.

The general register area can be accessed by address specification as a normal RAM whether or not it is

used as a register.

Fig. 3-5 General Register Configuraton

Address 3

Data Memory

0

3

000H

A Register

001H

X Register

3

002H

003H

004H

005H

L Register

H Register

E Register

D Register

3

Register Bank 0

3

006H

007H

008H

00FH

010H

017H

018H

01FH

C Register

B Register

Same

Configuration

as Bank 0

Same

Configuration

as Bank 0

Same

Configuration

as Bank 0

Register Bank 1

Register Bank 2

Register Bank 3

Fig. 3-6 Register Pair Configuration

0

3

B

0

C

0

3

D

0

3

H

0

3

X

0

E

0 1 Bank

L

0

A

32

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