DUMC ;========= UM6521 / UM6521A Peripheral Interface Adapter(PIA) Features • Extended performance version of UM6520 • Single +5V power supply • Two 8-bit bi-directional I/O ports with individual data direction control • CMOS-compatible 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 General Descr~ption The UM6521/A Peripheral Interface Adapter (PIA) is designed to provide a broad range of peripheral control to microcomputer systems.
It is functionally compatible with the UM6520, but with more drive capability and improved pe...

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