D17133CS datasheet(57/289 Pages) NEC

57 / 289 page

CHAPTER 7

SYSTEM REGISTER (SYSREG)

Figure 7-2 shows the configuration of the system register. As shown in Figure 7-2, the system register consists

of the following seven registers.

• Address register

(AR)

• Window register

(WR)

• Bank register

(BANK)

• Index register

(IX)

• Data memory row address pointer

(MP)

• General register pointer

(RP)

• Program status word

(PSWORD)

Figure 7-2. System Register Configuration

Note Zeros in the columns indicates "0 fixed".

74H

Address

77H

75H

76H

78H

79H

7AH

7BH

7CH

7DH

7EH

7FH

b3 b2 b1 b0

AR3

0000

b3 b2 b1 b0

AR2

0000

b3 b2 b1 b0

AR1

0000

b3 b2 b1 b0

AR0

0000

b3 b2 b1 b0

BANK

0000

b3 b2 b1 b0

IXH

MPH

0000

b3 b2 b1 b0

IXM

MPL

0000

b3 b2 b1 b0

IXL

0000

b3 b2 b1 b0

RPH

0000

b3 b2 b1 b0

RPL

0000

b3 b2 b1 b0

PSW

0000

000000

0000

Name

Bit

Symbol

Data

Note

Initial value

when reset

Address register

(AR)

Window

(WR)

Data memory

row address

pointer (MP)

Index register

(IX)

General

pointer

(RP)

Program

status

word

(PSWORD)

Not

defined

(AR)

Bank

(BANK)

(MP)

(RP)

(IX)

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