UM6521 Overview
<DUMC ;========= UM6521 / UM6521A Peripheral Interface Adapter(PIA).
UM6521 Key Features
- Extended performance version of UM6520
- Single +5V power supply
- Two 8-bit bi-directional I/O ports with individual data
- CMOS-patible peripheral port A lines
- Automatic "handshake" control of data transfers
- Programmable interrupt capability
- Automatic initialization on power up
- 1 and 2 MHz versions
- Direct replacement for Motorola MC6821