MB8840/MB8840H Family
Developer	Fujitsu
Manufacturer	Fujitsu
Production	1977-1992
ISA	MB8850
Word size	4 bit 0.5 octets 1 nibbles
Technology	nMOS
Clock	1 MHz-6 MHz
Package	DIP42, DIP28, QFP48

The MB8840/MB8840H series is a family of 4-bit nMOS microcontrollers developed by Fujitsu and introduced in 1977^[off?]. This series was very popular for arcade games (e.g. some Atari's Namco Galaga/Xevious systems). This series is architecturally identical to the MB8850 family (A CMOS version).

Members

The "H" versions are identical to their non-"H" counterparts but aimed to be "high performance", capable of operating at higher frequency (up to 8 MHz).

Family Members
Part	ROM	RAM	I/O Ports	Instructions	Notes
MB8841	2kx8 bit	128x4-bit	37	70
MB8842	2kx8 bit	128x4 bit	25	69
MB8843	1kx8 bit	64x4 bit	37	70
MB8844	1kx8 bit	64x4 bit	25	69
MB8845	2kx8 bit	128x4-bit	37	70
MB8846	2kx8 bit	128x4-bit	25	69
MB8847	1kx8 bit	64x4 bit	37	70
MB8848	1kx8 bit	64x4 bit	25	69

ISA

Main article: MB8850 ISA

The MB8840 has an identical ISA to that of the MB8850.

Documents

• MB8840 Datasheet.

See also

• MB88500, a CMOS version

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