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 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

Model	ROM	RAM	Registers	Stack Registers	I/O Lines	Part No.
HMCS42	512x10-bit	32x4-bit	4	2	22	HD38702
HMCS43	1024x10-bit	80x4-bit	6	3	32	HD38750, HD38755
HMCS43C	1024x10-bit	80x4-bit	6	3	32	HD38750
HMCS43CL	1024x10-bit	80x4-bit	6	3	32	HD38755
HMCS44	2048x10-bit	160x4-bit	8	4	32	HD38800, HD38805
HMCS44C	2048x10-bit	160x4-bit	8	4	32	HD44801
HMCS44CL	2048x10-bit	160x4-bit	8	4	32	HD44808
HMCS45	2048x10-bit	160x4-bit	6	4	44	HD44820, HD44828
HMCS45C	2048x10-bit	160x4-bit	6	4	44	HD44820
HMCS45CL	2048x10-bit	160x4-bit	6	4	44	HD44828
HMCS46	4096x10-bit	256x4-bit	8	4	32	HD44840, HD44848
HMCS46C	4096x10-bit	256x4-bit	8	4	32	HD44840
HMCS46CL	4096x10-bit	256x4-bit	8	4	32	HD44848
HMCS47	4096x10-bit	256x4-bit	6	4	44	HD44860, HD44868
HMCS47C	4096x10-bit	256x4-bit	6	4	44	HD44860
HMCS47CL	4096x10-bit	256x4-bit	6	4	44	HD44868
LCD-III	2048x10-bit	160x4-bit	6	4	32	HD44795, HD44790
LCD-IV	4096x10-bit	256x4-bit	6	4	32	HD613901

Design

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ISA

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Documents

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