XR16M781IL24 EXAR [Exar Corporation], XR16M781IL24 Datasheet - Page 39
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XR16M781IL24
Manufacturer Part Number
XR16M781IL24
Description
1.62V TO 3.63V UART WITH 64-BYTE FIFO AND VLIO INTERFACE
Manufacturer
EXAR [Exar Corporation]
Datasheet
1.XR16M781IL24.pdf
(52 pages)
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REV. 1.0.1
FC[7:0]: RX/TX FIFO Level Count
Receive/Transmit FIFO Level Count. Number of characters in Receiver FIFO (FCTR[7] = 0) or Transmitter
FIFO (FCTR[7] = 1) can be read via this register. Reading this register is not recommended when transmitting
or receiving data.
FCTR[1:0]: RTS Hysteresis
User selectable RTS# hysteresis levels for hardware flow control application. After reset, these bits are set to
“0” to select the next trigger level for hardware flow control. See
FCTR[2]: IrDa RX Inversion
•
•
FCTR[3]: Auto RS-485 Direction Control
•
•
FCTR[5:4]: Transmit/Receive Trigger Table Select
See
FCTR[6]: Scratchpad Swap
•
•
FCTR[7]: Programmable Trigger Register Select
•
•
Enhanced features are enabled or disabled using this register. Bit 0-3 provide single or dual consecutive
character software flow control selection (see
are selected, the double 8-bit words are concatenated into two sequential characters. Caution: note that
whenever changing the TX or RX flow control bits, always reset all bits back to logic 0 (disable) before
programming a new setting.
4.16
4.17
Logic 0 = Select RX input as encoded IrDa data (Idle state will be LOW).
Logic 1 = Select RX input as inverted encoded IrDa data (Idle state will be HIGH).
Logic 0 = Standard ST16C550 mode. Transmitter generates an interrupt when transmit holding register
becomes empty and transmit shift register is shifting data out.
Logic 1 = Enable Auto RS485 Direction Control function. The direction control signal, RTS# pin, changes its
output logic state from LOW to HIGH one bit time after the last stop bit of the last character is shifted out.
Also, the Transmit interrupt generation is delayed until the transmitter shift register becomes empty. The
RTS# output pin will automatically return to a LOW when a data byte is loaded into the TX FIFO. However,
RTS# behavior can be inverted by setting EMSR[3] = 1.
Logic 0 = Scratch Pad register is selected as general read and write register. ST16C550 compatible mode.
Logic 1 = FIFO Count register (Read-Only), Enhanced Mode Select Register (Write-Only). Number of
characters in transmit or receive FIFO can be read via scratch pad register when this bit is set. Enhanced
Mode Select Register is selected when it is written into.
Logic 0 = Registers TRG and FC selected for RX.
Logic 1 = Registers TRG and FC selected for TX.
Table 16
Feature Control Register (FCTR) - Read/Write
Enhanced Feature Register (EFR) - Read/Write
for more details.
FCTR
B
IT
0
0
1
1
-5
T
1.62V TO 3.63V UART WITH 64-BYTE FIFO AND VLIO INTERFACE
ABLE
FCTR
B
IT
0
1
0
1
-4
16: T
Table
RIGGER
17). When the Xon1 and Xon2 and Xoff1 and Xoff2 modes
39
T
Table-C (TX/RX)
Table-D (TX/RX)
Table-A (TX/RX)
Table-B (TX/RX)
ABLE
T
ABLE
Table 13
S
ELECT
for more details.
XR16M781