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TL16C550DIPT Fiches technique(PDF) 10 Page - Texas Instruments

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No de pièce TL16C550DIPT
Description  ASYNCHRONOUS COMMUNICATIONS ELEMENT WITH AUTOFLOW CONTROL
Download  54 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TL16C550DIPT Fiches technique(HTML) 10 Page - Texas Instruments

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TL16C550D
,, TL16C550DI
SLLS597E – APRIL 2004 – REVISED DECEMBER 2008 .................................................................................................................................................. www.ti.com
TERMINAL FUNCTIONS (FOR RHB PACKAGE)
TERMINAL
I/O
DESCRIPTION
NAME
NO.
A0
19
Register select. A0
−A2 are used during read and write operations to select the ACE register
A1
18
I
to read from or write to. See Table 1 for register addresses, and see the ADS description.
A2
17
Chip select. When CS0 and CS1 are high and CS2 is low, these three inputs select the ACE.
CS2
8
I
When any of these inputs are inactive, the ACE remains inactive (see the ADS description).
Clear to send. CTS is a modem status signal. Its condition can be checked by reading bit 4
(CTS) of the modem status register. Bit 0 (
ΔCTS) of the modem status register indicates that
CTS
24
I
CTS has changed states since the last read from the modem status register. If the modem
status interrupt is enabled when CTS changes levels and the auto-CTS mode is not enabled,
an interrupt is generated. CTS is also used in the auto-CTS mode to control the transmitter.
D0
29
D1
30
D2
31
D3
32
Data bus. Eight data lines with 3-state outputs provide a bidirectional path for data, control,
I/O
D4
1
and status information between the ACE and the CPU.
D5
3
D6
4
D7
5
Data carrier detect. DCD is a modem status signal. Its condition can be checked by reading
bit 7 (DCD) of the modem status register. Bit 3 (
ΔDCD) of the modem status register
DCD
26
I
indicates that DCD has changed states since the last read from the modem status register. If
the modem status interrupt is enabled when DCD changes levels, an interrupt is generated.
Data set ready. DSR is a modem status signal. Its condition can be checked by reading bit 5
(DSR) of the modem status register. Bit 1 (
ΔDSR) of the modem status register indicates
DSR
39
I
DSR has changed levels since the last read from the modem status register. If the modem
status interrupt is enabled when DSR changes levels, an interrupt is generated.
Data terminal ready. When active (low), DTR informs a modem or data set that the ACE is
ready to establish communication. DTR is placed in the active level by setting the DTR bit of
DTR
33
O
the modem control register. DTR is placed in the inactive level either as a result of a master
reset, during loop mode operation, or clearing the DTR bit.
Interrupt. When active (high), INTRPT informs the CPU that the ACE has an interrupt to be
serviced. Four conditions that cause an interrupt to be issued are: a receiver error, received
INTRPT
30
O
data that is available or timed out (FIFO mode only), an empty transmitter holding register, or
an enabled modem status interrupt. INTRPT is reset (deactivated) either when the interrupt
is serviced or as a result of a master reset.
Master reset. When active (high), MR clears most ACE registers and sets the levels of
MR
35
various output signals (see Table 2).
2,9,
NC
I
No connection
15, 16,
Read inputs. When either RD1 or RD2 is active (low or high, respectively) while the ACE is
RD1
14
I
selected, the CPU is allowed to read status information or data from a selected ACE register.
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
RI
27
I
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.
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
RTS
21
O
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.
SIN
6
I
Serial data input. SIN is serial data input from a connected communications device.
Serial data output. SOUT is composite serial data output to a connected communication
SOUT
7
O
device. SOUT is set to the marking (high) level as a result of master reset.
VCC
28
2.25-V to 5.5-V power supply voltage
VSS
13
Supply common
Write inputs. When either WR1 or WR2 is active (low or high, respectively) and while the
WR1
12
I
ACE is selected, the CPU is allowed to write control words or data into a selected ACE
register.
10
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