CZ80PIO

Features:

• Provides a direct interface between Z80 microprocessor systems and peripheral devices
• Two ports with interrupt-driven handshake for fast response
• Four programmable operating modes:
• Output Mode (both ports)
• Input Mode (both ports)
• Bi-directional (Port A only)
• Bit Control Mode (both ports)
• Programmable interrupts on peripheral status conditions


Application

• Programmable, dual - port device
• Interface for a wide range of peripheral
•devices such as:
• Keyboards
• Printers
• Paper table readers
• PROM programmers etc.


Pinout




Description

The CZ80PIO, hereinafter referred to as PIO, is a dual-port device and the CZ80PIO can be programmed by the system software to function as a broad range of peripheral devices that are compatible with the Z80CPU such as most keyboards, printers etc.
System design is simplified because the PIO connects directly to the Z80CPU with no additional logic. In larger systems, address decoders and buffers may be required.
The CZ80PIO is a microcode-free design developed for reuse in ASIC and FPGA implementations. The design is strictly synchronous, with no internal tri-states and a synchronous reset.