General Description
The a6850 MegaCore function implements an ACIA, which is a universal asynchronous receiver/transmitter (UART). The a6850 provides an interface between a microprocessor and a serial communications channel. The a6850 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.

FEATUREs
■ a6850 MegaCore function implementing an asychronous communications interface adapter (ACIA)
■ Optimized for FLEX® and MAX® architectures
■ Programmable word lengths, stop bits, and parity
■ Offers divide-by-1, -16, or -64 mode
■ Includes error detection
■ Uses approximately 237 FLEX logic elements (LEs)
■ Functionally based on the Motorola MC6850 device, except as noted in the “Variations & Clarifications” section on page 94