NEC μCOM-43SL
Manufacturer	NEC
Model Number	μCOM-43SL
Part Number	μPD557L
Introduction	1981 (launch)
General information
Family	μCOM-43
Clock	100 kHz-180 kHz
Microarchitecture
Microarchitecture	μCOM-4
Technology	pMOS
Word size	4 bit 0.5 octets 1 nibbles
Electrical
Op. Temp	-10 °C – 70 °C
Supply VDD	-8.0 V
Supply VSS	0 V
Memory
RAM	48 B 4.8e-5 MB 0.048 kB 384 b 4.8e-8 GB (96x4 bit)
ROM	2 kB 0.002 MB 2,000 B 16,000 b 2.0e-6 GB (2000x8 bit)
Stack	3 levels
Pins
Pins	28
IRQ lines	1
I/O ports	21
Packaging
Package	DIP28 (DIP)

The μPD557L or μCOM-43SL is a general-purpose 4-bit microcontroller introduced in 1980 by NEC. This MCU is a 28-pin, low-power part of the μCOM-43 family, working with a reduced supply voltage of -8.0 V_GG. This model has open-drain outputs capable of being pulled to -35V, allowing direct driving of Vacuum Fluorescent Displays.

Design

This section is empty; you can help add the missing info by editing this page.

Instruction Set

Main article: μCOM-4 ISA

This model executes the full 80-instructions set of the μCOM-43 family.

Documents

This section is empty; you can help add the missing info by editing this page.

References

• NEC Microcomputers, Inc., 1980 Catalog, "μCOM-4: 4-Bit Single Chip Microcomputer Family, μCOM-43SL CPU μPD557L", 104, 125-126 pp.
• NEC Microcomputers, Inc., 1981 Catalog, "μCOM-4: 4-Bit Single Chip Microcomputer Family, μPD557L μCOM-43SL", 155, 177-178 pp.
• NEC Electronics (Europe) GmbH, 1982 Catalog, "μCOM-4: 4-Bit Single Chip Microcomputer Family, μPD557L μCOM-43SL", 12, 159-160 pp.

See also

• μCOM-43
• μCOM-4
• μCOM-8

This article is still a stub and needs your attention. You can help improve this article by editing this page and adding the missing information.