NEC PD75P402, PD75402A user manual General, Fax Ppc, Ecr Vcr

CHAPTER 1. GENERAL

CHAPTER 1. GENERAL

The μPD75402A, 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 μPD75402A has shortened the conventional μPD75402’s minimum instruction execution time to 0.95 μs. The μPD75P402 is also capable of high-speed processing.

It is possible to reduce the burden on the host microcomputer by using the μPD75402A, 75P402 as the slave microcomputer by using the μPD75402A, 75P402 as the slave microcomputer for decentralized processing. The μPD75402A, 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 μPD75P402 is a product with the μPD75402A’s built-in mask ROM having been replaced with the one-time PROM. It is compatible with the μPD75402A except for the program memory and the mask option. The pin connection at write is the same as in the standard EPROM μPD27C256A and also has the same writing characteristics. Therefore, it is possible to write directly using the general-purpose PROM writer. The μPD75P402 is suitable for preproduction at system development and short-run and multiple-device production.

Name		Program Memory		Data Memory
μPD75402A	1920	× 8	(mask ROM)	64 × 4 (RAM)
μPD75P402	1920	× 8	(one-time PROM)	64 × 4 (RAM)

Remarks In this manual, the μPD75402A is described as the representative model unless there are particular differences in functions. If using it as the μPD75P402 manual, the μPD75402A, should be read as the μPD75P402.

1