Ch 1. general – NEC PD75402A User Manual

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CHAPTER 1. GENERAL

Name

Program Memory

Data Memory

PD75402A

1920

8 (mask ROM)

4 (RAM)

PD75P402

1920

8 (one-time PROM)

4 (RAM)

CHAPTER 1. GENERAL

The

PD75402A, 75P402 is a CMOS 4-bit single-chip microcomputer adopting the 75X architecture. With its built-

in NEC standard serial bus interface (SBI), it is suitable as a slave microcomputer in a multiprocessor system

configuration using the 75X, 78K series as the host microcomputer.

The

PD75402A has shortened the conventional

PD75402’s minimum instruction execution time to 0.95

s. The

PD75P402 is also capable of high-speed processing.

It is possible to reduce the burden on the host microcomputer by using the

PD75402A, 75P402 as the slave

microcomputer by using the

PD75402A, 75P402 as the slave microcomputer for decentralized processing. The

PD75402A, or 75P402 is most suitable for slave processes for the following devices such as the key input control,

LED, etc. display control, or remote control send/receive control, etc.

• FAX

• PPC

• Printer

• ECR

• VCR

• Remote control commander

The

PD75P402 is a product with the

PD75402A’s built-in mask ROM having been replaced with the one-time

PROM. It is compatible with the

PD75402A except for the program memory and the mask option. The pin connection

at write is the same as in the standard EPROM

PD27C256A and also has the same writing characteristics. Therefore,

it is possible to write directly using the general-purpose PROM writer. The

PD75P402 is suitable for preproduction

at system development and short-run and multiple-device production.

Remarks

In this manual, the

PD75402A is described as the representative model unless there are particular

differences in functions. If using it as the

PD75P402 manual, the

PD75402A, should be read as the

PD75P402.

This manual is related to the following products:

PD75P402