CZ80CPU
8-bit Microprocessor Core
General Description
Features
Implements a fast, fully-functional, single-chip, 8-
bit microprocessor with the same instruction set
as the Z80.
Programming features contain 208 bits of
read/write memory that are accessible to the
programmer. The internal registers include an
accumulator and six 8-bit registers that can be
paired as three 16-bit registers. In addition to
general registers, a 16-bit stack-pointer, 16-bit
program-counter, and two 16-bit index registers
are provided.
The core has a 16-bit address bus capable of
directly accessing 64kB of memory space. It has
252 root instructions with the reserved 4 bytes as
prefixes, and accesses an additional 308
instructions. The microcode-free design is strictly
synchronous, with no internal tri-states and a
synchronous reset.
Control Unit
•
o 8-bit Instruction decoder
Developed for easy reuse in Actel FPGA
applications, the CZ80CPU is available optimized
for several device families with competitive
utilization and performance characteristics.
Arithmetic-Logic Unit
•
o 8-bit arithmetic and logical operations
o 16-bit arithmetic operations
o Boolean manipulations
Symbol
Register File Unit
•
o Duplicate set of both general purpose and
flag registers
o Two 16-bit index registers
Interrupt Controller
•
o Three modes of maskable interrupts
o Non maskable interrupt
External Memory interface
•
o Can address up to 64 KB of program
memory
o Can address up to 64 KB of data memory
o Can address up to 64 KB of input/output
devices
On-core dynamic memory refresh counter
•
Applications
Suitable for many embedded controller
applications, including industrial control systems,
point-of-sale terminals, and automotive controls.
CAST, Inc.
April 2003
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