XR21B1411IL-0A-EB Datasheet, PDF (12/30 Pages) Exar Corporation – ENHANCED 1-CH FULL-SPEED USB UART

XR21B1411
ENHANCED 1-CH FULL-SPEED USB UART
TABLE 2: SUPPORTED USB CONTROL COMMANDS
NAME
REQUEST
TYPE
REQUEST
VALUE
INDEX
LENGTH
XR_SET_REG
0x40
0
val val regis- regis- 0
0
LSB MSB ^{ter ter}
addr. addr.
LSB MSB
XR_GET_REG
0xC0
1
0
0 regis- regis- 2
0
ter ter
addr. addr.
LSB MSB
REV. 1.2.0
DESCRIPTION
Exar custom command: set
one 12-bit register
val: 12-bit register value
register address: see
Table 5
Exar custom register: get
one 12-bit register
register address: see
Table 5
NOTE: 1) Line coding length field are defined in Table 3
NOTE: 2) Control Signal Bitmap values for SetControlLineState are defined in Table 4
TABLE 3: SET_LINE_CODING
OFFSET
FIELD
SIZE
VALUE
DESCRIPTION
0
dwDTERate
4
Number Data terminal rate, in bits per second
4
bCharFormat
1
Number Stop bits:
0 = 1 Stop bit
2 = 1 Stop bits
(1.5 stop bits not supported in B1411)
5
bParityType
1
Number Parity:
0 = None
1 = Odd
2 = Even
3 = Mark
4 = Space
6
bDataBits
1
Number Data bits (7, 8 or 9)
TABLE 4: SET_CONTROL_LINE_STATE
BIT POSITION
D15..D2
D1
D0
DESCRIPTION
Reserved (Reset to zero)
Carrier control for half duplex modems. This signal corresponds to RS-232 signal
RTS.
0 = Deactivate carrier (Clear RTS)
1 = Activate carrier (Set RTS)
The device ignores the value of this bit when operating in full duplex mode
Indicates to DCE if DTE is present or not. This signal corresponds to RS-232 sig-
nal DTR.
0 = Not present (Clear DTR)
1 = Present (Set DTR)
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