xr21v1410 Exar Corporation, xr21v1410 Datasheet - Page 18

• Manufacturer Part Number: xr21v1410
• Description: 1-ch Full-speed Usb Uart
• Manufacturer: Exar Corporation

XR21V1410
1-CH FULL-SPEED USB UART
FLOW_CONTROL[2:0]: Flow control mode select
FLOW_CONTROL[3]: Half-Duplex Mode
•
•
FLOW_CONTROL[7:4]: Reserved
These bits are reserved and should remain ’0’.
The XON_CHAR and XOFF_CHAR registers store the XON and XOFF characters, respectively, that are used
in the Automatic Software Flow control.
XON_CHAR[7:0]: XON Character
In Automatic Software Flow control mode, the UART will resume data transmission when the XON character
has been received.
For behavior in the Address Match mode, see
Transceiver Control” on page
For behavior in the Address Match with TX Flow Control mode, see
Automatic Transmitter Enable” on page
XOFF_CHAR[7:0]: XOFF Character
In Automatic Software Flow control mode, the UART will suspend data transmission when the XOFF character
has been received.
For behavior in the Address Match mode, see
Transceiver Control” on page
For behavior in the Address Match with TX Flow Control mode, see
Automatic Transmitter Enable” on page
This register reports any errors that may have occurred on the line such as break, framing, parity and overrun.
ERROR_STATUS[2:0]: Reserved
These bits are reserved. Any values read from these bits should be ignored.
ERROR_STATUS[3]: Break error
•
•
3.3.7
3.3.8
Logic 0 = Normal (full-duplex) mode. The UART can transmit and receive data at the same time.
Logic 1 = Half-duplex Mode. In half-duplex mode, any data on the RX pin is ignored when the UART is
transmitting data.
Logic 0 = No break condition
Logic 1 = A break condition has been detected (clears after read).
B
IT
0
0
0
0
1
-2
XON_CHAR, XOFF_CHAR Register Descriptions (Read/Write)
ERROR_STATUS Register Description - Read-only
B
IT
0
0
1
1
0
-1
B
IT
0
1
0
1
0
-0
9.
9.
T
ABLE
No flow control.
HW flow control enabled
SW flow control enabled
Multidrop mode with Automatic Half-Duplex Transceiver control
Multidrop mode with Automatic Transmitter Enable
12: F
9.
9.
LOW
“Section 1.4.7, Multidrop Mode with Automatic Half-Duplex
“Section 1.4.7, Multidrop Mode with Automatic Half-Duplex
C
ONTROL
18
M
ODE
M
S
ODE
ELECTION
D
“Section 1.4.8, Multidrop Mode with
“Section 1.4.8, Multidrop Mode with
ESCRIPTION
REV. 1.0.0