XR21B1422IL40-0A Datasheet, PDF (29/60 Pages) Exar Corporation – Enhanced 2-Ch Full-Speed USB UART

XR21B1422
CUSTOMIZED_INT (0x012) - Read/Write
This register enables the customized interrupt packet format that will report all GPIO pin status in the interrupt packet.
Bit
15:2
1
0
Default
Description
0
Reserved
These bits are reserved and should be written as ‘0’.
0
Break Interrupt Enable
0: No interrupt is generated when break character is received.
1: Interrupt is generated when break character is received.
0
Enable
0: Use standard interrupt packet. See Table 6.
1: Use customized interrupt packet. See Table 8.
Table 6: Standard Interrupt Packet Format
Offset
Field
0
bmRequestType
1
bNotification
2
wValue
4
wIndex
6
wLength
8
Data
Size
(Bytes)
Value
1
8’b10100001
1
8’h20
2
16’h0000
2
16’h0000
2
16’h0002
2
Standard
int_status
See Table 7
Description
D7 = Device-to-host direction
D6:5 = Class Type
D4:0 = Interface Recipient
Defined encoding for SERIAL_STATE
D15:8 = Reserved (0)
D7:0 = Interface number, 8’h00 for the
CDC Command Interface
2 bytes of transferred data
D15-7 = Reserved (0)
D6 = bOverRun
D5 = bParity
D4 = bFraming
D3 = bRingSignal (RI)
D2 = bBreak
D1 = bTxCarrier (DSR)
D0 = bRxCarrier (CD)
© 2014 Exar Corporation
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