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GM16C550

GM16C550

ASYNCHRONOUS COMMUNICATIONS

ELEMENT WITH FIFOs

Descriptions

The GM16C550 is an asynchronous communi-

cations element (ACE) that is functionally

equivalent to the GM16C450, and addition-ally

incorporates a 16byte FIFOs are available on both

the transmitter and receiver, and can be activated by

placing the device in the FIFO mode. After a reset,

the registers of the GM16C550 are identical to those

of the GM16C450.

The UART performs serial-to-parallel conver- sion

on data characters received from a peri-pheral

device or a MODEM, and parallel-to- serial

conversion on data characters received from the

CPU. The CPU can read the com- plete status of

the UART at any time during

the functional

operation. Status information reported includes the

type and condition of

the transfer operations

being performed by

the UART, as well as any

error conditions (parity, overrun, framing, or break

interrupt).

Features

Fully compatible with GM16C450.

Modem controm signals include

CTS

,

RTS

,

DSR

,

DTR

,

RI

and -

DCD

.

l

Programmable serial characteristics:

鈥?6-, 7- or 8-bit characters

5-,

鈥?Even-, odd-, or no-parity bit generation and

detection

鈥?1

1/2

- or 2-stop bit generation

1-,

鈥?Baud rate generation (DC to 256K baud)

l

16 byte FIFO reduces CPU interrupts.

l

Independent control of transmit, receive, line

status, data set interrupts, FIFOs.

l

Full status reporting capabilities

l

Three-state, TTL drive capabilities for bi-

derectional data bus and control bus.

l

40DIP/44PLCC

l

l

Pin Configulation

D0

D1

D2

D3

D4

D5

D6

D7

RCLK

SIN

SOUT

CS0

CS1

CS2

BAUDQUT

XTAL1

XTAL2

DOSTR

DOSTR

VSS

VCC

RI

DCD

DSR

CTS

MR

OUT1

DTR

RTS

OUT2

INTRPT

RXRDY

A0

A1

A2

ADS

TXRDY

DDIS

DISTR

DISTR

D4

D3

D2

D1

D0

N.C.

VCC

RI

DCD

DSR

CTS

D5

D6

D7

RCLK

SIN

N.C.

SOUT

CS0

CS1

CS2

BAUDQUT

VSS

N.C.

DISTR

DISTR

DDIS

TXRDY

MR

OUT1

DTR

RTS

OUT2

N.C.

INTRPT

RXRDY

A0

A1

A2

1

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