UPD17708 datasheet(58/358 Pages) RENESAS

58 / 358 page

µPD17704, 17705, 17707, 17708, 17709

6. GENERAL REGISTER (GR)

6.1 Outline of General Register

Figure 6-1 outlines the general register.

As shown in the figure, the general register is specified in the data memory by the general register pointer.

The bank and row address of the general register are specified by the general register pointer.

The general register is used to transfer or operate data between data memory addresses.

Figure 6-1. Outline of General Register

Remark

The

µPD17704 and 17705 do not have BANKs 6 through 14.

The

µPD17707 and 17708 do not have BANKs 10 through 14.

6.2 General Register

The general register consists of 16 nibbles (16

× 4 bis) of the same row address on the data memory.

For the range of the banks and row addresses that can be specified by the general register pointer as a general

The 16 nibbles of the same row address specified as a general register operate or transfer data with the data

memory by a single instruction.

In other words, operation or data transfer between data memory addresses can be executed by a single

instruction.

The general register can be controlled by the data memory manipulation instruction, like the other data

memory areas.

Column address

BANK2

BANK1

BANK0

Data memory

General register

Transfer, operation

General register

pointer

System register

BANK15

BANK14

UPD17708 Datasheet(PDF) 58 Page - Renesas Technology Corp