The Hitachi HMCS40 is a family of 4-bit microcontrollers developed by Hitachi. Two types of each component were manufactured, one using PMOS logic for low cost and another using CMOS where lower power was more desired than cost.

The chips contained 4-bit ALU performing BCD arithmetic. 2,048 Words (10-bit ea) of program ROM. Additional 128 Words (10-bit ea) of pattern ROM. 160 digits (4-bit ea) of data RAM. Chips also contained Event/Timer-Counter and 32 I/O lines. Output was aimed for driving dot matrix Liquid Crystal displays. The HMCS40 was used in a very large array of games, toys, controllers, and office equipment

Design

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