sc26c198 NXP Semiconductors, sc26c198 Datasheet

sc26c198

Manufacturer Part Number

sc26c198

Description

Octal Uart With Ttl Compatibility At 3.3v And 5v Supply Voltages

Manufacturer

NXP Semiconductors

Datasheet

1.SC26C198.pdf (49 pages)

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Philips Semiconductors

Table of Contents

Description

Features

Pin Configurations

Pinout

Absolute Maximum Ratings

Block Diagram

Functional Description

Conceptual Overview

Detailed Descriptions

Receiver and Transmitter

Modes of Operation

General Purpose Output Pin Control

1995 May 1

Octal UART with TTL compatibility at 3.3V

and 5V supply voltages

Uses

Pin Description

Host Interface

Timing Circuits

Channel Blocks

Interrupt Control

Transmitter

Receiver

I/O ports

General Purpose Pins

Global Registers

Character Recognition

Interrupt Arbitration and IRQN generation

Major Modes

Minor Modes

MR – Mode Registers

UCIR – Update CIR

Asynchronous bus cycle

Synchronous bus cycle

Crystal Oscillator

Sclk – System Clock

Baud Rate Generator BRG

BRG Counters (Used for random baud rate generation)

Character Recognition

Global Registers

I/O Ports

Transmitter Status Bits

Transmission of ”break”

1x and 16x modes, Transmitter

Transmitter FIFO

1x and 16x mode, Receiver

Receiver Status Bits

Receiver FIFO

RxFIFO Status: Status reporting modes

Xon Xoff Characters

Multi-drop or Wake up or 9 bit mode

Character Stripping

IACKN Cycle, Update CIR

Polling

Enabling and Activating Interrupt sources

Setting Interrupt Priorities

Watch-dog Timer Time–out Mode

Wake Up Mode

Xon/Xoff Operation

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342

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351

361

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344

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347

348

349

351

360

336

Reset Conditions

DC Electrical Specifications

(26C198 and 68C198)

DC Electrical Specifications

(26L198 and 68L198)

AC Electrical Characteristics5 (26L198 and

68L198)

INDEX

DESCRIPTION

The Philips 26C198 Octal UART is a single chip CMOS–LSI

communications device that provides 8 full-duplex asynchronous

channels with significantly deeper 16 byte FIFOs, Automatic

in–band flow control using Xon/Xoff characters defined by the user

and address recognition in the wake up mode. Synchronous bus

interface is used for all communication between host and OCTART.

It is fabricated using Philips 1.0 micron CMOS technology that

combines the benefits of low cost, high density and low power

consumption.

The operating speed of each receiver and transmitter can be

selected independently from one of 22 fixed baud rates, a 16X clock

derived from one of two programmable baud rate counters or one of

three external 16X clocks (1 available at 1x clock rate). The baud

rate generator and counter can operate directly from a crystal or

from seven other external or internal clock inputs. The ability to

independently program the operating speed of the receiver and

transmitter makes the Octal UART particularly attractive for dual

speed full duplex channel applications such as clustered terminal

systems. The receivers and transmitters are buffered with FIFOs of

16 characters to minimize the potential for receiver overrun and to

reduce interrupt overhead. In addition, a handshaking capability and

in–band flow control are provided to disable a remote UART

transmitter when the receiver buffer is full or nearly so.

To minimize interrupt overhead an interrupt arbitration system is

included which reports the context of the interrupting UART via

direct access or through the modification of the interrupt vector. The

context of the interrupt is reported as channel number, type of

device interrupting ( receiver COS etc.) and, for transmitters or

receivers, the fill level of the FIFO.

The Octal UART provides a power down mode in which the

oscillator is stopped but the register contents are maintained. This

results in reduced power consumption of several orders of

magnitudes. The Octal UART is fully TTL compatible when

operating from a single +5V power supply. Operation at 3.3 volts is

maintained with CMOS interface levels.

The device also offered in a version which maintains TTL input and

output levels while operating with a 3.3 volt power supply.

Device Configuration after Hardware Reset or CRa cmd=x1F 372

Cleared registers:

Clears Modes for:

Disables:

Halts:

Limitations:

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SC26C198 SC68C198

SC26L198 SC68L198

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Product specification

853-1756 15179

364

372

373

376

377

383

372

373

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