UPD17708 datasheet(46/358 Pages) RENESAS

46 / 358 page

µPD17704, 17705, 17707, 17708, 17709

5. SYSTEM REGISTERS (SYSREG)

5.1 Outline of System Registers

Figure 5-1 shows the location of the system registers on the data memory and their outline.

As shown in the figure, the system registers are allocated to addresses 74H through 7FH of all the banks

of the data memory. Therefore, identical system registers exist at addresses 74H through 7FH of any bank.

Because the system registers are located on the data memory, they can be manipulated by all data memory

manipulation instructions.

Seven types of system registers are available depending on function.

Figure 5-1. Location and Outline of System Registers on Data Memory

Column address

Data memory

BANK0

BANK1

BANK2

0123456789

BANK14

BANK15

System register

Address

Name

Function

74H

75H

76H

77H

78H

79H

7AH

7BH

7CH

7DH

7EH

7FH

Address register

(AR)

Controls program memory address

Window

(WR)

Transfers

data with

file

Bank

(BANK)

Specifies

bank of

data

memory

Data memory row

address pointer (MP)

Index register

(IX)

Modifies address of data memory

General register

pointer (RP)

Specifies

address of

general register

Program

status

word

(PSWORD)

Controls

operation

Remark

The PD17704 and 17705 do not have the BANKs 6 through 14.

The PD17707 and 17708 do not have BANKs 10 through 14.

UPD17708 Datasheet(PDF) 46 Page - Renesas Technology Corp

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