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TL16C550AN Folha de dados(PDF) 1 Page - Texas Instruments

Nome de Peças TL16C550AN
Descrição Electrónicos  ASYNCHRONOUS COMMUNICATIONS ELEMENT
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TL16C550AN Folha de dados(HTML) 1 Page - Texas Instruments

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TL16C550A
ASYNCHRONOUS COMMUNICATIONS ELEMENT
SLLS057D – AUGUST 1989 – REVISED MARCH 1996
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D Capable of Running With All Existing
TL16C450 Software
D After Reset, All Registers Are Identical to
the TL16C450 Register Set
D In the FIFO Mode, Transmitter and Receiver
Are Each Buffered With 16-Byte FIFOs to
Reduce the Number of Interrupts to the
CPU
D In the TL16C450 Mode, Holding and Shift
Registers Eliminate the Need for Precise
Synchronization Between the CPU and
Serial Data
D Programmable Baud Rate Generator Allows
Division of Any Input Reference Clock by 1
to (216 – 1) and Generates an Internal 16
×
Clock
D Standard Asynchronous Communication
Bits (Start, Stop, and Parity) Added to or
Deleted From the Serial Data Stream
D Independent Receiver Clock Input
D Transmit, Receive, Line Status, and Data
Set Interrupts Independently Controlled
D Fully Programmable Serial Interface
Characteristics:
– 5-, 6-, 7-, or 8-Bit Characters
– Even-, Odd-, or No-Parity Bit Generation
and Detection
– 1-, 1 1/2-, or 2-Stop Bit Generation
– Baud Generation (dc to 256 Kbit/s)
D False-Start Bit Detection
D Complete Status Reporting Capabilities
D 3-State TTL Drive Capabilities for
Bidirectional Data Bus and Control Bus
D Line Break Generation and Detection
D Internal Diagnostic Capabilities:
– Loopback Controls for Communications
Link Fault Isolation
– Break, Parity, Overrun, Framing Error
Simulation
D Fully Prioritized Interrupt System Controls
D Modem Control Functions (CTS, RTS, DSR,
DTR, RI, and DCD)
D Faster Plug-In Replacement for National
Semiconductor NS16550A
description
The TL16C550A is a functional upgrade of the TL16C450 asynchronous communications element (ACE).
Functionally identical to the TL16C450 on power up (character mode), the TL16C550A can be placed in an
alternate mode (FIFO) to relieve the CPU of excessive software overhead.
In this mode, internal FIFOs are activated allowing 16 bytes (plus 3 bits of error data per byte in the receiver
FIFO) to be stored in both receive and transmit modes. To minimize system overhead and maximize system
efficiency, all logic is on the chip. Two of the TL16C450 terminal functions (terminals 24 and 29 on the N package
and terminals 27 and 32 on the FN package) have been changed to allow signalling of direct memory address
(DMA) transfers.
The TL16C550A performs serial-to-parallel conversion on data received from a peripheral device or modem
and parallel-to-serial conversion on data received from its CPU. The CPU can read and report on the status of
the ACE at any point in the ACE’s operation. Reported status information includes the type of transfer operation
in progress, the status of the operation, and any error conditions encountered.
The TL16C550A ACE includes a programmable, on-board, baud rate generator. This generator is capable of
dividing a reference clock input by divisors from 1 to (216 – 1) and producing a 16
× clock for driving the internal
transmitter logic. Provisions are included to use this 16
× clock to drive the receiver logic. Also included in the
ACE is a complete modem control capability and a processor interrupt system that may be software tailored
to the user’s requirements to minimize the computing required to handle the communications link.
† The TL16C550A can also be reset to the TL16C450 mode under software control.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
© 1996, Texas Instruments Incorporated


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