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The ZiLOG Z80 CPU family of components are fourth-generation
enhanced microprocessors with exceptional computational power. They
offer higher system throughput and more efficient memory utilization
than comparable second- and third-generation microprocessors. The
speed offerings from 6–20 MHz suit a wide range of applications which
migrate software. The internal registers contain 208 bits of read/write
memory that are accessible to the programmer. These registers include
two sets of six general purpose registers which may be used individually
as either 8-bit registers or as 16-bit register pairs. In addition, there are
two sets of accumulator and flag registers.
The Z80 CPU also contains a Stack Pointer, Program Counter, two index
registers, a
REFRESH register, and an INTERRUPT register. The CPU is
easy to incorporate into a system since it requires only a single +5V
power source. All output signals are fully decoded and timed to control
standard memory or peripheral circuits; the Z80 CPU is supported by an
extensive family of peripheral controllers.
Figure 1 illustrates the internal architecture and major elements of the
Z80 CPU.
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