The Zilog Enhanced Serial Communications Controller, Z80230 ESCC, is a pin and software compatible CMOS member of the SCC family introduced by Zilog in 1981. The ESCC is a dual-channel, full-duplex data communications controller capable of supporting a wide range of popular protocols. The ESCC is built from Zilog's industry standard SCC core and is compatible with designs using Zilog's SCC to receive and transmit data. It has many improvements that significantly reduce CPU overhead. The addition of a 4-byte transmit FIFO and an 8-byte receive FIFO significantly reduces the overhead required to provide data to, and get data from, the transmitters and receivers.