Hitachi HMCS40
Developer	Hitachi
Manufacturer	Hitachi
Type	microcontrollers
Production	1978-1995
ISA	HMCS40
Word size	4 bit 0.5 octets 1 nibbles
Technology	pMOS, CMOS
Clock	400 kHz-4.5 MHz
Package	DIP28, DIP42, QFP64

The Hitachi HMCS40 is a family of 4-bit microcontrollers developed by Hitachi and introduced in the late 1970s and continued well into the 90s. Two types of each component were manufactured, one using pMOS for low cost and another using CMOS where lower power was more desired. Hitachi later also introduce a replacement series called the HMCS400.

The chips contained 4-bit ALU performing BCD arithmetic. 512 to 2,048 Words (10-bit ea) of program ROM. Additional 128 Words (10-bit ea) of pattern ROM. 32 to 160 digits (4-bit ea) of data RAM. Chips also contained Event/Timer-Counter and 22-44 I/O lines. Output was aimed for driving dot matrix LCD (Liquid Crystal displays). The HMCS40 was used in a very large array of games, toys, controllers, and office equipment, specifically many devices with VFDs.

Devices

Part	Model	ROM	RAM	Registers	Stack Registers	I/O Lines
HD38702	HMCS42	512x 10-bit	32x 4-bit	4	2	22
HD38750, HD38755	HMCS43	1024x 10-bit	80x 4-bit	6	3	32
HD38750	HMCS43C	1024x 10-bit	80x 4-bit	6	3	32
HD38755	HMCS43CL	1024x 10-bit	80x 4-bit	6	3	32
HD38800, HD38805	HMCS44	2048x 10-bit	160x 4-bit	8	4	32
HD44801	HMCS44C	2048x 10-bit	160x 4-bit	8	4	32
HD44808	HMCS44CL	2048x 10-bit	160x 4-bit	8	4	32
HD44820, HD44828	HMCS45	2048x 10-bit	160x 4-bit	6	4	44
HD44820	HMCS45C	2048x 10-bit	160x 4-bit	6	4	44
HD44828	HMCS45CL	2048x 10-bit	160x 4-bit	6	4	44
HD44840, HD44848	HMCS46	4096x 10-bit	256x 4-bit	8	4	32
HD44840	HMCS46C	4096x 10-bit	256x 4-bit	8	4	32
HD44848	HMCS46CL	4096x 10-bit	256x 4-bit	8	4	32
HD44860, HD44868	HMCS47	4096x 10-bit	256x 4-bit	6	4	44
HD44860	HMCS47C	4096x 10-bit	256x 4-bit	6	4	44
HD44868	HMCS47CL	4096x 10-bit	256x 4-bit	6	4	44
HD44795, HD44790	LCD-III	2048x 10-bit	160x 4-bit	6	4	32
HD613901	LCD-IV	4096x 10-bit	256x 4-bit	6	4	32

Design

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ISA

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Documents

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