XR21V1414IM48 EXAR [Exar Corporation], XR21V1414IM48 Datasheet - Page 20

• Manufacturer Part Number: XR21V1414IM48
• Description: 4-CH FULL-SPEED USB UART
• Manufacturer: EXAR [Exar Corporation]

XR21V1414
4-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.
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
1
-5
-7
B
ITS
T
T
ABLE
ABLE
B
T
ABLE
11: S
IT
0
1
0
1
0
CHARACTER_FORMAT[3:0]
10: P
-4
N
TOP
UMBER OF
9: D
ARITY
20
2 stop bits
B
ATA
1 stop bit
IT
1000
1001
0111
S
S
Force parity to space, “0”
ELECTION
B
Force parity to mark, “1”
S
ELECTION
ITS
TOP
P
ARITY SELECTION
Even parity
B
Odd parity
No parity
ITS
REV. 1.0.0