MARC4 Family
Developer	Eurosil, Atmel
Manufacturer	Atmel, Eurosil
Type	microcontrollers
Production	1985-2014
Architecture	4-bit, Harvard architecture
ISA	MARC4
Word size	4 bit 0.5 octets 1 nibbles
Technology	CMOS
Clock	32 kHz-8 MHz
Package	SO20, SO24, SO44

The MARC4 was a family of 4-bit microcontrollers initially developed by Eurosil in the mid 1980s. Eurosil was later sold to Temic (TELEFUNKEN) and in 1998 was sold off to Atmel which continued to manufacture it well into the 2000s. The MARC4 targeted the ultra-power saving and wireless market.

History

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Members

Part	ROM (Prog)	ROM (Data)	RAM	I/O Ports	Package	Mem Type	Notes
ATAR080	2 kB		256x4 b	12	SO20	ROM
ATAR080-D	2 kB		256x4 b	12	SO20	ROM
ATAR090	2 kB		256x4 b	12	SO20	ROM
ATAR090-C	2 kB		256x4 b	12	SO20	ROM	IR + PWM (manchester code) + 32x16-bit EEPROM (separate die, same package)
ATAR090-D	2 kB		256x4 b	12	SO20	ROM	IR + RF communication
ATAR092	4 kB		256x4 b	16	SO20	ROM	IR + PWM (manchester code) + phase control
ATAR092-D	4 kB		256x4 b	16	SO20	ROM	IR + PWM (manchester code) + phase control
ATAR890	2 kB		256x4 b	12	SO20	ROM	IR + PWM (manchester code) + phase control + 32x16-bit EEPROM (separate die, same package)
ATAR890-C	2 kB		256x4 b	12	SO20	ROM	IR + PWM (manchester code)
ATAR892	4 kB		256x4 b	16	SO20	ROM	IR + PWM (manchester code) + phase control + 32x16-bit EEPROM (separate die, same package)
ATA6020N	2 kB		256x4 b	12	SO20	ROM	low-current
ATAR510	4 kB		256x4 b	34	SO44	ROM	Larger I/O support
ATAM893	4 kB	2x512 b	256x4 b	16	SO20	EEPROM
ATAM893-D	4 kB	2x512 b	256x4 b	16	SO20	EEPROM
ATAM893-J	4 kB	2x512 b	256x4 b	16	SO20	EEPROM
ATAM894	8 kB	2x32x16 b	256x4 b	16	SO24	EEPROM	extended memory
T48C510	4 kB		256x4 b	34	SO44	EEPROM
ATAM893-J	4 kB	2x512 b	256x4 b	16	SO20	EEPROM
ATAM893-D	4 kB	2x512 b	256x4 b	16	SO20	EEPROM

Design

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ISA

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Documents

• MARC4 Microcontrollers Programmer's Guide

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