IN16C554TQ 参数 Datasheet PDF下载

IN16C554PL/IN16C554TQ

QUAD-UART

ASYNCHRONOUS COMMUNICATIONS ELEMENT

NOVEMBER 2002-REVISED AUG 2006

1. General Description

IN16C554

is an enhanced quadruple version of the 16C550 UART (Universal Asynchronous Receiver

Transmitter). Each channel can be put into FIFO mode to relieve the CPU of excessive software overhead. In this

mode, internal FIFOs are activated and 16 bytes plus 3 bit of error data per byte can be stored in both receive

and transmit modes.

Each channel performs serial-to-parallel conversion on data characters received from a peripheral device or a

MODEM, and parallel-to-serial conversion on data characters received from the CPU. The CPU can read the

complete status of the UART at any time during the functional operation. The Status information includes the

type and condition of the transfer operations being performed by the UART, as well as any error conditions such

as parity, overrun, framing, and break interrupt.

IN16C554

includes a programmable baud rate generator which is capable of dividing the timing reference

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clock input by divisors of 1 to 2 -1, and producing a 16x clock for driving the internal transmitter logic.

Provisions are also included to use this clock to drive the receiver logic.

IN16C554

has complete MODEM-control capability and an interrupt system that can be programmed to the

user’s requirements, minimizing the computing required to handle the communication links.

2. Features

In the FIFO mode, Each channel’s transmitter and receiver is buffered with 16-byte FIFO to reduce

the number of interrupts to CPU.

Adds or deletes standard asynchronous communication bits (start, stop, parity) to or from the serial

data.

Holding Register and Shift Register eliminate need for precise synchronization between the CPU and

serial data.

Independently controlled transmit, receive, line status and data interrupts.

Programmable Baud Rate Generators which allow division of any input reference clock by 1 to 2 -1

and generate an internal 16X clock.

Independent receiver clock input

Modem control functions (CTS#, RTS#, DSR#, DTR#, RI#, and DCD#).

Fully programmable serial interface characteristics.

- 5-, 6-, 7-, or 8-bit characters

- Even-, Odd-, or No-Parity bit

- 1-, 1.5-, 2-Stop bit generation. ( Like other general UARTs, IN16C554 checks only one stop bit,

no matter how many they are)

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Rev. 01