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Older Z180 in PLCC package (the smaller QFP and LQFP packages are more common today).

The Zilog Z180 eight-bit processor is a successor of the Z80 CPU. It is compatible with the large base of software written for the Z80.[1] The Z180 family adds higher performance and integrated peripheral functions like clock generator, 16-bit counters/timers, interrupt controller, wait-state generators, serial ports and a DMA controller.[2] It uses separate read and write strobes, sharing similar timings with the Z80 and Intel processors.[3] The on-chip memory management unit (MMU) has the capability of addressing up to 1 MB of memory. It is possible to configure the Z180 to operate as the Hitachi HD64180.[4]

Chip Speed (MHz) Timers I/O Comm. Contr. Others
Z80180 6, 8, 10 2 N/S CPU 1 MB MMU, 2xDMAs, 2xUARTs
Z80181 10 1 16 CPU 1 MB MMU, 2xDMAs, 2xUARTs
Z80182 16, 33, 20 0 Clock Serial, 24 ESCC, CSIO, UART S180 Megacell, 2xESCC channels, 16550 MIMIC
Z80195 20, 33 4 7/24 SCC, CSIO, UART
Z8L180 20 2 Clock Serial CSIO, UART 1 MB MMU, 2xDMAs, 2xUARTs, 3.3 V Operation
Z8L182 20 0 Clock Serial ESCC, CSIO, UART S180 Megacell, 2xESCC channels, 16550 MIMIC, 3.3V operation
Z8S180 10, 20, 33 2 Clock Serial UART, DMA 1 MB MMU, 2xDMAs, 2xUARTs



The Zilog Z80182 is an enhanced, faster version of the older Z80 and is part of the Z180 microprocessor family. It's nicknamed the Zilog Intelligent Peripheral Controller (ZIP). It's also fully static (the clock can be halted and no data in the registers will be lost)[citation needed] and has a low EMI option that reduces the slew rate of the outputs.[citation needed]

The Z80182 can operate at 33 MHz with an external oscillator for 5-volt operation, or at 20 MHz using the internal oscillator for 3.3-volt operation.[5]


  1. ^ Ganssle, Jack (1992). "The Z80 Lives!". The designers picked an architecture compatible with the Z80, giving Z80 users a completely software compatible upgrade path
  2. ^ Jack G. Ganssle. (1992). The art of programming embedded systems. San Diego: Academic Press. p. 13. ISBN 978-0-12-274880-6.
  3. ^ Stuart R. Ball. (2002). Embedded microprocessor systems real world design. Amsterdam: Newnes. p. 34. ISBN 978-0-7506-7534-5.
  4. ^ "Z80 Application Note: Migrating from the Hitachi HD64180 to ZiLOG's Z80180, page 7 Summary". Zilog Inc. Retrieved May 20, 2019.
  5. ^ "CPU Control Register". Z80182/Z8L182 Zilog Intelligent Peripheral Controller Product Specification. San Jose, California: Zilog. 1997. pp. 3–48.


Further readingEdit