ZiLOG Z80 User Manual

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The Z80 CPU contains 208 bits of R/W memory that are available to the
programmer. Figure 2 illustrates how this memory is configured to
eighteen 8-bit registers and four 16-bit registers. All Z80 registers are
implemented using static RAM. The registers include two sets of six
general-purpose registers that may be used individually as 8-bit registers
or in pairs as 16-bit registers. There are also two sets of accumulator and
flag registers and six special-purpose registers.
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ZiLOG Z80 Specifications

General

Manufacturer	ZiLOG
Introduction Year	1976
Clock Speed	2.5 MHz to 20 MHz
Data Width	8-bit
Address Width	16-bit
Instruction Set	Z80
Transistor Count	8, 500
Package	40-pin DIP
Category	Microprocessor
Memory Address Space	64 KB
Voltage Supply	5V