xr21v1414 Exar Corporation, xr21v1414 Datasheet - Page 18

• Manufacturer Part Number: xr21v1414
• Description: 4-ch Full-speed Usb Uart
• Manufacturer: Exar Corporation

XR21V1414
4-CH FULL-SPEED USB UART
For baud rates that are not listed in the table above, use the index value calcuated using the formula in
“Section 3.3.3, TX_CLOCK_MASK0, TX_CLOCK_MASK1 Register Description (Read/Write)” on page 17
to determine which TX Clock and RX Clock Mask register values to use from
Mask register, there are 2 values listed and would depend on whether the Clock Divisor is even or odd. For
even Clock Divisors, use the value from the first column. For odd Clock Divisors, use the value from the last
column.
B
AUD
12000000
1000000
1152000
1500000
2000000
2500000
3000000
3125000
3500000
4000000
4250000
6250000
8000000
115200
230400
460800
500000
576000
921600
19200
38400
57600
R
1200
2400
4800
9600
ATE
T
ABLE
(
BPS
)
7: C
LOCK
C
D
LOCK
IVISOR AND
D
IVISOR
40000
20000
10000
5000
2500
1250
833
416
208
104
96
83
52
48
41
32
24
19
16
15
13
12
11
7
6
4
C
(D
LOCK
ECIMAL
M
18
)
ASK
V
ALUES FOR
TX C
LOCK
0x0B6D
0x0B6D
0x0B6D
0x076D
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0912
0x0912
0x0208
0x0000
0x0912
0x0040
0x0000
0x0000
0x0000
0x0104
0x0000
0x0492
0x0000
0x0122
0x0000
0x0000
M
C
ASK
OMMON
(H
EX
Table
)
B
AUD
8. For the the RX Clock
RX C
R
ATES
LOCK
0x0B6A
0x0DB6
0x0BB6
0x0DB6
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0924
0x0924
0x0040
0x0000
0x0924
0x0000
0x0000
0x0000
0x0000
0x0108
0x0000
0x0492
0x0000
0x0224
0x0000
0x0000
M
ASK
REV. 1.0.0
(H
EX
)