General Description

The a8251 MegaCore function provides an interface between a microprocessor and a serial communications channel. The a8251 receives and transmits data in a variety of configurations including 7- or 8-bit data words, with odd, even, or no parity, and 1 or 2 stop bits. The transmitter and receiver can be designed for synchronous or asynchronous operation.

Features

■ a8251 MegaCore function that provides an interface between a microprocessor and a serial communication channel

■ Optimized for FLEX® architecture

■ Programmable word length, stop bits, and parity

■ Offers divide-by-1, -16, or -64 mode

■ Supports synchronous and asynchronous operation

■ Uses approximately 528 FLEX logic elements (LEs)

■ Includes:

– Error detection

– False start bit detection

– Automatic break detection

– Internal and external sync character detection

■ Functionally based on the Intel M8251A device, except as noted in the “Variations & Clarifications” on page 44