XR21V1412IL32-F Exar Corporation, XR21V1412IL32-F Datasheet - Page 20

• 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
This register controls the character format such as the word length (7, 8 or 9), parity (odd, even, forced ’0’, or
forced ’1’) and number of stop bits (1 or 2).
CHARACTER_FORMAT[3:0]: Data Bits.
All other values for CHARACTER_FORMAT[3:0] are reserved.
CHARACTER_FORMAT[6:4]: Parity Mode Select
These bits select the parity mode. If 9-bit data mode has been selected, then writing to these bits will not have
any effect. In other words, there will not be an additional parity bit.
CHARACTER_FORMAT[7]: Stop Bit select
This register selects the number of stop bits to add to the transmitted character and how many stop bits to
check for in the received character.
These registers select the flow control mode. These registers should only be written to when the UART is
disabled.
behavior. Note that the FLOW_CONTROL register settings are used in conjunction with the GPIO_MODE
register.
3.3.5
3.3.6
CHARACTER_FORMAT Register Description (Read/Write)
FLOW_CONTROL Register Description (Read/Write)
Writing to the FLOW_CONTROL register when the UART is enabled will result in undefined
B
IT
0
0
0
0
1
-6
D
ATA
B
B
IT
0
0
1
1
0
IT
7
8
9
0
2
-5
-7
B
ITS
T
T
ABLE
ABLE
T
B
ABLE
12: S
IT
0
1
0
1
0
CHARACTER_FORMAT[3:0]
11: P
-4
N
10: D
TOP
UMBER OF
ARITY
20
2 stop bits
B
1 stop bit
ATA
IT
1000
1001
0111
S
S
ELECTION
Force parity to space, “0”
Force parity to mark, “1”
B
S
ELECTION
TOP
ITS
P
ARITY SELECTION
Even parity
B
Odd parity
No parity
ITS
REV. 1.1.0