UPD17201A datasheet(19/120 Pages) NEC

Part #	UPD17201A

Description	4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND A/D CONVERTER FOR INFRARED REMOTE CONTROL TRANSMITTERS

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Manufacturer	NEC [NEC]

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µPD17201A, 17207

19

4.4.2

System Registers (SYSREG)

The system registers are registers that are directly related to control of the CPU. These registers are mapped

to addresses 74H-7FH on the data memory and can be referenced regardless of bank specification.

The system registers include the following registers:

Address registers (AR0-AR3)

Window register (WR)

Bank register (BANK)

Memory pointer enable flag (MPE)

Memory pointers (MPH, MPL)

Index registers (IXH, IXM, IXL)

General register pointers (RPH, RPL)

Program status word (PSWORD)

Fig. 4-6 Configuration of System Register

b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0

74H

75H

76H

77H

78H

79H

7AH

7BH

7CH

7DH

7EH

7FH

AR 3

AR 2

AR 1

AR 0

WR

BANK

IXH

IXM

IXL

RPH

RPL

PSW

MPH

MPL

Address register

(AR)

Window

register

(WR)

Bank

register

(BANK)

Data memory

row address

pointer (MP)

Index register

(IX)

General

register

pointer

(RP)

Program

status

word

(PSWORD)

0000

00

M

P

E

B

C

D

C

M

P

C

YZ

I

X

E

(RP)

(IX)

(MP)

(BANK)

(AR)

Data

Bit

Symbol

Name

Address

Initial

Value

At

Reset

0000 0 0 00 0 0 0 00000

0 0 00 0 0 0 00000 0 0 00 0 0 0 00000 0000

Undefined

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UPD17201A Datasheet(PDF) 19 Page - NEC

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