xr21v1410 Exar Corporation, xr21v1410 Datasheet - Page 19

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

REV. 1.0.0
ERROR_STATUS[4]: Framing Error
•
•
ERROR_STATUS[5]: Parity Error
•
•
ERROR_STATUS[6]: Overrun Error
•
•
ERROR_STATUS[7]: Break Status
•
•
Writing a non-zero value to this register causes a break condition to be generated continuously until the
register is cleared. If data is being shifted out of the TX pin, the data will be completed shifted out before the
break condition is generated.
XCVR_EN_DELAY[3:0]: Turn-around delay
This is the number of bit times to wait before changing the direction of the transceiver from transmit to receive
when half-duplex mode is enabled.
XCVR_EN_DELAY[3:0]: Reserved
These bits are reserved and should be ’0’.
GPIO_MODE[2:0]: GPIO Mode Select
There are 4 modes of operation for the GPIOs. The descriptions can be found in
page
3.3.9
3.3.10
3.3.11
Logic 0 = No framing error
Logic 1 = A framing error has been detected (clears after read). A framing error occurs when a stop bit is not
present when it is expected.
Logic 0 = No parity error
Logic 1 = A parity error has been detected (clears after read).
Logic 0 = No overrun error
Logic 1 = An overrun error has been detected (clears after read). An overrun error occurs when the RX FIFO
is full and another byte of data is received.
Logic 0 = Break condition is no longer present.
Logic 1 = Break condition is currently being detected.
BITS
[2:0]
000
001
010
011
100
6.
TX_BREAK Register Description (Read/Write)
XCVR_EN_DELAY Register Description (Read/Write)
GPIO_MODE Register Description (Read/Write)
GPIO0
GPIO0
GPIO0
GPIO0
GPIO0
GPIO0
GPIO1
GPIO1
GPIO1
GPIO1
GPIO1
GPIO1
GPIO2
GPIO2
GPIO2
GPIO2
GPIO2
DSR#
GPIO3
GPIO3
GPIO3
GPIO3
GPIO3
DTR#
T
ABLE
GPIO4
GPIO4
GPIO4
GPIO4
GPIO4
CTS#
13: GPIO M
19
Enable
Enable
GPIO5
GPIO5
GPIO5
XCVR
XCVR
RTS#
ODES
GPIO Mode
Auto RTS/CTS HW Flow Control
Auto DTR/DSR HW Flow Control
Multidrop Mode with Auto Half-Duplex Trans-
ceiver Control
Multidrop Mode with Auto TX Enable
1-CH FULL-SPEED USB UART
M
ODE
“Section 1.4, UART” on
D
ESCRIPTION
XR21V1410