XR22802 Datasheet, PDF (38/46 Pages) Exar Corporation – Hi-Speed USB to 10/100 Ethernet Bridge

EDGE_SET_0 (0x3C2) - Write Only
Bit
15:0
Default
Description
0x0000
E[15:0]
0: No effect
1: Set IO pin assigned to EDGE function and configured as an output to a logic ‘1’
XR22802
EDGE_CLEAR_0 (0x3C3) - Write Only
Bit
15:0
Default
Description
0x0000
E[15:0]
0: No effect
1: Clear IO pin assigned to EDGE function and configured as an output to a logic ‘0’
EDGE_STATE_0 (0x3C4) - Read/Write
Bit
15:0
Default
Description
0x0000
E[15:0]
Writing in this register sets or clears the EDGE IO pin(s) configured as an output. Writing to an EDGE pin con-
figured as an input has no effect. Reading this register returns the state of each IO pin configured as an EDGE
pin irrespective of whether it is configured as an input or output. Note that output transitions across multiple IO
pins may be slightly staggered. Refer to EDGE section on page 15.
0: Write clears the corresponding bit to a ‘0’. Read returns the current state.
1: Write sets the corresponding bit to a ‘1.’ Read returns the current state.
EDGE_TRI_STATE_0 (0x3C5) - Read/Write
Bit
15:0
Default
Description
0x0000
E[15:0]
0: IO pin assigned to EDGE function and configured as an output is actively driven
1: IO pin assigned to EDGE function and configured as an output is tri-stated
EDGE_OPEN_DRAIN_0 (0x3C6) - Read/Write
Bit
15:0
Default
Description
0x0000 E[15:0]
Note that XR22802 open drain outputs have a weak internal pull-up.
0: IO pin assigned to EDGE function and configured as an output is a push-pull output
1: IO pin assigned to EDGE function and configured as an output is an open drain output
© 2015 Exar Corporation
38 / 46
exar.com/XR22802
Rev 1B