ZiLOG Z80 User Manual

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• Add
• Subtract
• Logical AND
• Logical OR
• Logical Exclusive OR
• Compare
• Left or Right Shifts or Rotates (Arithmetic and Logical)
• Increment
• Decrement
• Set Bit
• Reset Bit
• Test bit
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As each instruction is fetched from memory, it is placed in the
INSTRUCTION register and decoded. The control sections performs this
function and then generates and supplies the control signals necessary to
read or write data from or to the registers, control the ALU, and provide
required external control signals.
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The Z80 CPU I/O pins are illustrated in Figure 3 and the function of each
is described in the following paragraphs.

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