NEC µPD751

from Wikipedia, the free encyclopedia

The NEC µPD751 was the first single-chip microprocessor developed and manufactured in Japan.

Nippon Coca Cola commissioned Sharp to manufacture portable credit card readers (handheld POS terminals with the code name BillPet ). However, Sharp needed microprocessors for these devices and approached NEC in early 1971 to develop and manufacture them. At the beginning of December 1971, the result was a 4-bit two-chip microprocessor consisting of the µPD707 and µPD708 circuits. Meanwhile the developers heard about the Intel 4004 and decided to develop a single-chip microprocessor from the µPD707 and µPD708, which was named µPD751 (µCOM-4).

Data:

Early version of the µPD751
  • Published: 1973
  • Data bus: 4 bits
  • Address bus: 12 bits
  • Operating voltages: −5 V, +5 V, 12 V
  • Manufacturing technology: NMOS,? µm
  • Number of transistors: 2500
  • Number of instructions: 55
  • Clock frequency: up to 1 MHz
  • Housing: plastic DIP, ceramic DIP with 28 pins

The µCOM-4 consisted of the following components:

  • µPD751: 4 bit CPU
  • µPD752: 8 bit I / O ports
  • µPD757:
  • µPD758: