MC68681P

Dual Asynchronous Reciiver/Transmitter IC

M6800 Bus Compatible

Two, Independent, Full-Duplex Asynchronous

Receiver/Transmitter Channes

Maximum Data Transfer

1X - 1 Mbps

16X - 125 kbps

Quadruple-Buffered Receiver Data Registers

Double-Buffered Transmitter Data Registers

Independently Programmable Baud Rate for

Each Receiver and Transmitter

Selectable from :

18 Fixed Rates : 50 to 38.4k Baud

One User-Defined Rate Derived from a

Programmable Timer/Counter

External 1X Clock or 16X Clock

Programmable Data Format

Five to Eight Data Bits plus Parity

Odd, Even, No Parity, or Force Parity

One, One and One-Half, or Two Stop Bits

Programmable in One-Sixteenth-bit Increments

Programmable Channel Modes

Normal (Full Duplex)

Automatic Echo

Local Loopback

Remote Loopback

Automatic Wakeup Mode for Multidrop Applications

Multifunction 6-Bit Input Port

Can Serve as Clock or Control Inputs

Charge-of-State Detection on Four Inputs

Multifunction 8-Bit Output Port

Individual Bit Set/Reset Capability

Outputs Can Be Programmable To Be Status/Interrup

Signals

Multifuntion 16-Bit Programmable Counter/Timer

Versatile Interrupt System

Single Interrupt Output with Maskable Interrpting

Conditions

Interrupt Vector Output on Interrup Acknowledge

Output Port Can Be Configured To Provide a Total

of up to Six Separate Wire-ORable Interrupt Outputs

Parity, Framing, and Overrun Error Detection

False-start Bit Detection

Line-Break detection and Generation

Detects Break Originating in the Middle of a Character

Start-End Break Interrupt/Status

On-Chip Crystal Oscillator

TTL Compatible

Single +5 - V Power Supply

Semiconductors High Power Equipment Repair