Z84C90_12 Datasheet, PDF (8/56 Pages) Zilog, Inc. – KIO Serial/Parallel Counter/Timer

Z84C90 KIO Serial/Parallel Counter/Timer
Product Specification
1
Introduction
Zilog’s Z84C90 Serial/Parallel Counter/Timer KIO is a multichannel, multipurpose I/O
peripheral device designed to provide the end user with a cost-effective and powerful solu-
tion to meet an assortment of peripherals requirements. The Z84C90 KIO Peripheral com-
bines the features of one Z84C30 CTC, one Z84C20 PIO and a Z84C4x SIO, plus an 8-bit,
bit-programmable I/O port and a crystal oscillator into a single 84-pin PLCC or 100-pin
LQFP package. Utilizing fifteen internal registers for data and programming information,
the KIO can easily be configured to any given system environment. Although optimum
performance is obtained with a Z84C00 CPU, the KIO can just as easily be used with any
other CPU.
Features
The Z84C90 Serial/Parallel Counter/Timer KIO offers the following features:
• Two independent synchronous/asynchronous serial channels
• Three 8-bit parallel ports
• Four independent counter/timer channels
• On-chip clock oscillator/driver
• Software/hardware resets
• Designed in CMOS for low power operations
• Supports Z80 Family interrupt daisy chain
• Programmable interrupt priorities
• 8, 10 and 12.5MHz bus clock frequency
• Single +5V power supply
Table 1 lists the differing frequencies offered for the Z84C90 KIO Peripheral by package
and part number.
PS011804-0612
Introduction