Ei68C684

Part Numbers May Be Marked With "IMP" or "Ei." Semiconductor, Inc. Ei82C684 Ei68C684 QUAD UART 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 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 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. Two basic versions of the QUART are pin selectable with SEL pin and each is o...