DESCRIPTION

The Epic Ei68C684/Ei88C684 Quad Universal Asynchronous Receiver and Transmitter (QUART) is a data communication device that provides four fully independent full duplex asynchronous communication channels in a single package. The QUART is designed for use in microprocessor based systems and may be used in a polled or interrupt driven environment.

FEATURES

• Full duplex, four channel asynchronous receiver and transmitter

• Quadruple-buffered receiver and transmitter

• Internal bit rate generator with 23 industry standard bit rates operating from either of two standard crystal clocks

• Independent bit rate selection for each receiver and transmitter

• Maximum bit rate: 1 x clock - 2 Mb/sec., 16 x clock- 250 Kb/sec.

• Normal, auto-echo, local loop-back and remote loop-back modes

• Multi-function 16-bit counter/timer

• Programmable interrupt daisy chain

• Up to 32 I/O pins (depending on package and version)

• Change of state detectors on inputs

• Multidrop mode compatible with 8051 ninebit mode

• Stop bits programmable in 1/16-bit increments

• Pin selectable 88xxx/68xxx interface

• Debounced reset pin (20 nsec. min)

• On-chip oscillator for crystal

• Programmable internal clock:X1/CLK or X1/CLK divided by 2

• Buffered system clock output pin

• Stand-by mode to reduce operating power

• Advanced CMOS low power technology