UPD17145CT datasheet(21/102 Pages) NEC

21 / 102 page

µPD17145(A1), 17147(A1), 17149(A1)

6. GENERAL REGISTER (GR)

As its name implies, the general register is used for general purposes such as data transfer and operation.

The general register of the 17K series is not a fixed area, but an area specified on the data memory by using

the general register pointer (RP). Therefore, a part of the data memory area can be specified as a general

memory can be operated with a single instruction.

6.1 General Register Pointer (RP)

RP is a pointer that specifies part of the data memory as the general register. RP specifies the bank and

row addresses of a data memory area that is to be specified as the general register. Consisting of a total of

7 bits, RP is assigned to 7DH (RPH) and 7EH (RPL), and the higher 3 bits of the system register (refer to 7.

SYSTEM REGISTER (SYSREG)).

RPH specifies a bank, and RPL specifies a data memory row address.

Figure 6-1. Configuration of General Register Pointer

BANK0

7DH

7EH

RPH

RPL

b3 b2 b1 b0 b3 b2 b1 b0

0000

0000000

Row addresses

0H to 7H can be

specified by

general register

pointer (RP).

Row

address

Column address

System register

General register

area when

RPH = 0000B,

RPL = 010

×B

Address

Name

Symbol

Bit

Data

Reset

General register

pointer (RP)

General register (16 nibbles)

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