UM6521
Key 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 performance. Control of peripheral devices is accomplished through two 8-bit bi-directional I/O ports. Each 1/0 line may be programmed to be either an input or an output. In addition, four peripheral control lines are provided to perform "handshaking" during data transfers. Pin Con
