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ST16C550CP40 Arkusz danych(PDF) 8 Page - Exar Corporation

Numer części ST16C550CP40
Szczegółowy opis  UART WITH 16-BYTE FIFO?셲
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ST16C550CP40 Arkusz danych(HTML) 8 Page - Exar Corporation

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ST16C550
8
Rev. 5.01
GENERAL DESCRIPTION
The ST16C550 provides serial asynchronous receive
data synchronization, parallel-to-serial and serial-to-
parallel data conversions for both the transmitter and
receiver sections. These functions are necessary for
converting the serial data stream into parallel data that
is required with digital data systems. Synchronization
for the serial data stream is accomplished by adding
start and stops bits to the transmit data to form a data
character (character orientated protocol). Data integ-
rity is insured by attaching a parity bit to the data
character. The parity bit is checked by the receiver for
any transmission bit errors. The electronic circuitry to
provide all these functions is fairly complex especially
when manufactured on a single integrated silicon
chip. The ST16C550 represents such an integration
with greatly enhanced features. The ST16C550 is
fabricated with an advanced CMOS process.
The ST16C550 is an upward solution that provides 16
bytes of transmit and receive FIFO memory, instead
of 1 byte provided in the 16C450. The ST16C550 is
designed to work with high speed modems and shared
network environments, that require fast data process-
ing time. Increased performance is realized in the
ST16C550 by the larger transmit and receive FIFO’s.
This allows the external processor to handle more
networking tasks within a given time. The 4 selectable
levels of FIFO trigger provided for maximum data
throughput performance especially when operating in
a multi-channel environment. The combination of the
above greatly reduces the bandwidth requirement of
the external controlling CPU, increases performance,
and reduces power consumption.
The ST16C550 is capable of operation to 1.5Mbps
with a 24 MHz crystal or external clock input.
With a crystal of 14.7464 MHz and through a software
option, the user can select data rates up to 460.8Kbps
or 921.6Kbps.
FUNCTIONAL DESCRIPTIONS
Internal Registers
The ST16C550 provides 12 internal registers for
monitoring and control. These registers are shown in
Table 3 below. These registers function as data hold-
ing registers (THR/RHR), interrupt status and control
registers (IER/ISR), a FIFO control register (FCR),
line status and control registers, (LCR/LSR), modem
status and control registers (MCR/MSR), program-
mable data rate (clock) control registers (DLL/DLM),
and a user assessable scratchpad register (SPR).


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