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TL16C752C
DUAL UART
WITH 64-BYTE FIFO
SLLS646 – MARCH 2008
TERMINAL FUNCTIONS (continued)
TERMINAL
NO.
I/O
DESCRIPTION
NAME
PFB
RHB
Request to send (active low). These outputs are associated with individual UART
channels A through D. A low on the RTS pins indicates the transmitter has data ready
and waiting to send. Writing a 1 in the modem control register (MCR[1]) sets these pins
RTSA, RTSB,
33, 22
21, 14
O
to low, indicating data is available. After a reset, these pins are set to 1. These pins only
affect the transmit and receive operation when auto-RTS function is enabled through the
enhanced feature register (EFR[6]), for hardware flow control operation.
Receive data input. These inputs are associated with individual serial channel data to
the TL16C752C. During the local loopback mode, these RX input pins are disabled and
RXA, RXB,
5, 4
4, 3
I
TX data is internally connected to the UART RX input internally. During normal mode,
RXn should be held high when no data is being received. These outputs also can be
used in IrDA mode. See the IrDA mode section for more information.
Receive ready (active low). RXRDYA and RXRDYB go low when the trigger level has
RXRDYA,
31, 18
O
been reached or a timeout interrupt occurs. They go high when the RX FIFO is empty or
RXRDYB
there is an error in RX FIFO.
Transmit data. These outputs are associated with individual serial transmit channel data
TXA, TXB,
7, 8
5, 6
O
from the TL16C752C. During the local loopback mode, the TX input pin is disabled and
TX data is internally connected to the UART RX input.
TXRDYA,
Transmit ready (active low). TXRDYA and TXRDYB go low when there are a trigger
43, 6
O
TXRDYB
level number of spares available. They go high when the TX buffer is full.
VCC
6, 42
4, 26
Pwr
Power supply inputs
Crystal or external clock input. XTAL1 functions as a crystal input or as an external clock
input. A crystal can be connected between XTAL1 and XTAL2 to form an internal
XTAL1
13
9
I
oscillator circuit (see Figure 10). Alternatively, an external clock can be connected to
XTAL1 to provide custom data rates.
Output of the crystal oscillator or buffered clock. See also XTAL1. XTAL2 is used as a
XTAL2
14
10
O
crystal oscillator output or buffered clock output.
4
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Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): TL16C752C


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