XR21B1424_17 Datasheet, PDF (41/64 Pages) Exar Corporation – Enhanced 4-Ch Full-Speed USB UART

XR21B1424
Bit
9:8
7:6
5
4:2
1:0
Default
Description
0x2
CTRL1
00: Invalid
01: USB_STAT2 open drain
10: USB_STAT2 actively driven
11: Invalid
0
Reserved
These bits are reserved and should be written as ‘0’.
0
STATE0 - Read only
Returns the current state of the USB_STAT1 pin.
0
SEL0
000: USB_STAT1 asserted low when in suspended state or when USB bus reset is asserted
001: USB_STAT1 asserted high when in suspended state
010: For low power device (<= 100 mA) USB_STAT1 asserted high when in suspended state. For high power device (101-500
mA) asserted high when in suspended state or when not yet configured.
011: USB_STAT1 asserted high when USB bus reset is asserted
100: USB_STAT1 asserted low when in suspended state or when USB bus reset is asserted
101: USB_STAT1 asserted low when in suspended state
110: For low power device (<= 100 mA) USB_STAT1 asserted low when in suspended state. For high power device (101-500
mA) asserted low when in suspended state or when not yet configured.
111: USB_STAT1 asserted low when USB bus reset is asserted
0x2
CTRL0
00: Invalid
01: USB_STAT1 open drain
10: USB_STAT1 actively driven
11: Invalid
41 / 64
exar.com/XR21B1424
Rev 1C