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COM81C17LJP

Twenty Pin UART (TPUART)

SMSC -> Microchip 

COM81C17

Twenty Pin UART (TPUART)

FEATURES

! Single Chip UART With Baud Rate

Generator

! Asynchronous Operation

- 16 Selectable Baud Rate Clock

Frequencies (Internal)

- External 16x Clock (100 KBaud)

- Character Length: 7 or 8 Bits

- 1 or 2 Stop Bit Selection

! Small 20 Pin DIP (300 mil) or PLCC

! Full or Half Duplex Operation

! Double Buffering of Data

! Programmable Interrupt Generation

! Programmable Modem/Terminal Signals

! Odd or Even Parity Generate and Detect

! Parity, Overrun and Framing Error Detection

! TTL Compatible Inputs and Outputs

! High Speed Host Bus Operation (with no

wait state)

! Low Power CMOS

! Single +5V Power Supply

GENERAL DESCRIPTION

The COM81C17 TPUART is an asynchronous

only receiver/transmitter with a built in

programmable baud rate generator housed in a

twenty pin package. The TPUART receives

serial data streams and converts them into

parallel data characters for the processor. While

receiving serial data, the TPUART will also

accept data characters from the processor in

parallel format and convert them into serial

format along with start, stop and optional parity

bus. The TPUART will signal the processor via

interrupt when it has completely transmitted or

received a character and requires service.

Complete status information is available to the

processor through the status register. The

TPUART features two general purpose control

pins that can be individually programmed to

perform as terminal or modem control

handshake signals.

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