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TL16C550CFNR Folha de dados(PDF) 7 Page - Texas Instruments

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Nome de Peças TL16C550CFNR
Descrição Electrónicos  ASYNCHRONOUS COMMUNICATIONS ELEMENT WITH AUTOFLOW CONTROL
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

TL16C550CFNR Folha de dados(HTML) 7 Page - Texas Instruments

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TL16C550C, TL16C550CI
ASYNCHRONOUS COMMUNICATIONS ELEMENT
WITH AUTOFLOW CONTROL
SLLS177H − MARCH 1994 − REVISED JANUARY 2006
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions (Continued)
TERMINAL
NAME
NO.
N†
NO.
FN
NO.
PT
I/O
DESCRIPTION
OUT1
OUT2
34
31
38
35
34
31
O
Outputs 1 and 2. These are user-designated output terminals that are set to the active (low) level by
setting respective modem control register (MCR) bits (OUT1 and OUT2). OUT1 and OUT2 are set to
inactive the (high) level as a result of master reset, during loop mode operations, or by clearing bit 2
(OUT1) or bit 3 (OUT2) of the MCR.
RCLK
9
10
5
I
Receiver clock. RCLK is the 16
× baud rate clock for the receiver section of the ACE.
RD1
RD2
21
22
24
25
19
20
I
Read inputs. When either RD1 or RD2 is active (low or high respectively) while the ACE is selected,
the CPU is allowed to read status information or data from a selected ACE register. Only one of these
inputs is required for the transfer of data during a read operation; the other input should be tied to its
inactive level (i.e., RD2 tied low or RD1 tied high).
RI
39
43
41
I
Ring indicator. RI is a modem status signal. Its condition can be checked by reading bit 6 (RI) of the
modem status register. Bit 2 (TERI) of the modem status register indicates that RI has transitioned from
a low to a high level since the last read from the modem status register. If the modem status interrupt
is enabled when this transition occurs, an interrupt is generated.
RTS
32
36
32
O
Request to send. When active, RTS informs the modem or data set that the ACE is ready to receive
data. RTS is set to the active level by setting the RTS modem control register bit and is set to the inactive
(high) level either as a result of a master reset or during loop mode operations or by clearing bit 1 (RTS)
of the MCR. In the auto-RTS mode, RTS is set to the inactive level by the receiver threshold control logic.
RXRDY
29
32
29
O
Receiver ready. Receiver direct memory access (DMA) signalling is available with RXRDY. When
operating in the FIFO mode, one of two types of DMA signalling can be selected using the FIFO control
register bit 3 (FCR3). When operating in the TL16C450 mode, only DMA mode 0 is allowed. Mode 0
supports single-transfer DMA in which a transfer is made between CPU bus cycles. Mode 1 supports
multitransfer DMA in which multiple transfers are made continuously until the receiver FIFO has been
emptied. In DMA mode 0 (FCR0 = 0 or FCR0 = 1, FCR3 = 0), when there is at least one character in
the receiver FIFO or receiver holding register, RXRDY is active (low). When RXRDY has been active
but there are no characters in the FIFO or holding register, RXRDY goes inactive (high). In DMA mode 1
(FCR0 = 1, FCR3 = 1), when the trigger level or the time-out has been reached, RXRDY goes active
(low); when it has been active but there are no more characters in the FIFO or holding register, it goes
inactive (high).
SIN
10
11
7
I
Serial data input. SIN is serial data input from a connected communications device
SOUT
11
13
8
O
Serial data output. SOUT is composite serial data output to a connected communication device. SOUT
is set to the marking (high) level as a result of master reset.
TXRDY
24
27
23
O
Transmitter ready. Transmitter DMA signalling is available with TXRDY. When operating in the FIFO
mode, one of two types of DMA signalling can be selected using FCR3. When operating in the
TL16C450 mode, only DMA mode 0 is allowed. Mode 0 supports single-transfer DMA in which a transfer
is made between CPU bus cycles. Mode 1 supports multitransfer DMA in which multiple transfers are
made continuously until the transmit FIFO has been filled.
VCC
40
44
42
5-V supply voltage
VSS
20
22
18
Supply common
WR1
WR2
18
19
20
21
16
17
I
Write inputs. When either WR1 or WR2 is active (low or high respectively) and while the ACE is
selected, the CPU is allowed to write control words or data into a selected ACE register. Only one of
these inputs is required to transfer data during a write operation; the other input should be tied to its
inactive level (i.e., WR2 tied low or WR1 tied high).
XIN
XOUT
16
17
18
19
14
15
I/O
External clock. XIN and XOUT connect the ACE to the main timing reference (clock or crystal).
The N package is Not Recommended for New Designs.


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