XR21V1412IL32-F Exar Corporation, XR21V1412IL32-F Datasheet - Page 10

• Manufacturer Part Number: XR21V1412IL32-F
• Description: IC UART FIFO USB DUAL 32QFN
• Manufacturer: Exar Corporation
• Type: USB UARTsr

Specifications of XR21V1412IL32-F

• Package / Case: 32-VFQFN Exposed Pad
• Features: *
• Number Of Channels: 2, DUART
• Fifo's: 128 Byte, 384 Byte
• Protocol: USB 2.0
• Voltage - Supply: 2.97 V ~ 3.63 V
• With Auto Flow Control: Yes
• Mounting Type: Surface Mount
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Supply Current: 16 mA
• Operating Supply Voltage: 2.97 V to 3.63 V
• No. Of Channels: 2
• Data Rate: 12Mbps
• Uart Features: Automatic Hardware And Software Flow Control, Half-Duplex Mode, Fractional Baud Rate Generator
• Supply Voltage Range: 2.97V To 3.63V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 1016-1301 - EVAL BOARD FOR XR21V1412IL
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 1016-1302

XR21V1412
2-CH FULL-SPEED USB UART
Error flags are also available from the ERROR_STATUS register and the interrupt packet, however these flags
are historical flags indicating that an error has occurred since the previous read of the status register.
Therefore, no conclusion can be drawn as to which specific byte(s) may have contained an actual error in this
manner.
Each UART has 6 GPIOs. By default, the GPIOs are general purpose I/Os. However, there are few modes
that can be enabled to add additional feature such as Auto RTS/CTS Flow control, Auto DTR/DSR Flow
Control or Transceiver Enable Control. See
GPIO5 and GPIO4 of the UART channel can be enabled as the RTS# and CTS# signals for Auto RTS/CTS
flow control when GPIO_MODE[2:0] = ’001’ and FLOW_CONTROL[2:0] = ’001’. Automatic RTS flow control is
used to prevent data overrun errors in local RX FIFO by de-asserting the RTS signal to the remote UART.
When there is room in the RX FIFO, the RTS pin will be re-asserted. Automatic CTS flow control is used to
prevent data overrun to the remote RX FIFO. The CTS# input is monitored to suspend/restart the local
transmitter (see
1.5.3
1.5.4
GPIO
Automatic RTS/CTS Hardware Flow Control
2nd byte
2nd byte
1st byte
1st byte
Figure
4):
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
x x x x O F B P
x x x x O F B 8
7 or 8 bit m ode
9 bit m ode
F
IGURE
Table
3. R
ECEIVE
14.
10
D
B = B reak
F = Fram ing E rror
B = B reak
F = Fram ing E rror
O = O verrun E rror
P = P arity E rror (= ‘0’ if not enabled)
x = ‘0’
O = O verrun E rror
ATA
x = ‘0’
7 = ‘0’ in 7 bit m ode
F
ORMAT
REV. 1.1.0