UPD17708 datasheet(38/356 Pages) NEC

38 / 356 page

µPD17704, 17705, 17707, 17708, 17709

4.2 Configuration and Function of Data Memory

Figure 4-2 shows the configuration of the data memory.

As shown in this figure, the data memory is divided into several banks with each bank made up of a total of

128 nibbles with 7H row addresses and 0FH column addresses.

The data memory can be divided into five functional blocks. Each block is described in 4.2.1 through 4.2.5

below.

The contents of the data memory can be operated on, compared, judged, and transferred in 4-bit units with

a single data memory manipulation instruction.

Table 4-1 lists the data memory manipulation instructions.

4.2.1 System registers (SYSREG)

The system registers are allocated to addresses 74H through 7FH.

Because the system registers are allocated to all banks, the same system registers exist at addresses 74H

through 7FH of any bank.

For details, refer to 5. SYSTEM REGISTER (SYSREG).

4.2.2 Data buffer (DBF)

The data buffer is allocated to addresses 0CH through 0FH of BANK 0.

For details, refer to 9. DATA BUFFER (DBF).

4.2.3 Port registers

The port registers are allocated to addresses 70H through 73H of BANKs 0 through 3.

For details, refer to 11. GENERAL-PURPOSE PORTS.

4.2.4 Port input/output selection registers

Port input/output selection registers are allocated to addresses 60H through 6FH of BANK15.

For details, refer to 8.4 Port Input/Output Selection Register.

4.2.5 General-purpose data memory

The general-purpose data memory is allocated to the addresses of the data memory excluding those of the

system registers, port registers, and port input/output selection registers.

(a)

µPD17709

The general-purpose data memory of the

µPD17709 consists of a total of 1776 nibbles of the 112 nibbles

each of BANKs 0 through 15 (BANK15 only has 96 nibbles).

(b)

µPD17707, 17708

The general-purpose data memory of the

µPD17707 and 17708 consists of a total of 1120 nibbles of the

112 nibbles each of BANKs 0 through 9.

(c)

µPD17704, 17705

The general-purpose data memory of the

µPD17704 and 17705 consists of a total of 672 nibbles of the

112 nibbles each of BANKs 0 through 5.

UPD17708 Datasheet(PDF) 38 Page - NEC

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