The HD64180 is a Z80-based embedded microprocessor developed by Hitachi with an integrated memory management unit (MMU) and on-chip peripherals.

The HD64180 has the following features: The HD64180 has a pipelined execution unit which processes most instructions in fewer clock cycles than the Z80.

The on-chip DMAC makes block memory transfers possible at a rate faster than the LDIR/LDDR instructions.

[4] The on-chip generator for wait states makes it possible to access too-slow hardware on a selective basis using a device filter, as is done for the TRS-80 Model 4's balky keyboard.

The Micromint SB180, SemiDisk Systems DT42 CP/M computers, and Olivetti CWP 1 and ETV 210s videotypewriters (also running ROM-based CP/M 2.2) were based on the Hitachi HD64180.