XR22802 Datasheet, PDF (39/46 Pages) Exar Corporation – Hi-Speed USB to 10/100 Ethernet Bridge

XR22802
EDGE_PULL_UP_0 (0x3C7) - Read/Write
Bit
15:0
Default
Description
0xFFFF
E[15:0]
0: Disable internal pull-up resistor on IO pin assigned to EDGE function and configured as an input
1: Enable internal pull-up resistor on IO pin assigned to EDGE function and configured as an input
EDGE_PULL_DOWN_0 (0x3C8) - Read/Write
Bit
15:0
Default
Description
0x0000
E[15:0]
0: Disable internal pull-down resistor on IO pin assigned to EDGE function and configured as an input
1: Enable internal pull-down resistor on IO pin assigned to EDGE function and configured as an input
EDGE_INTR_MASK_0 (0x3C9) - Read/Write
Bit
15:0
Default
Description
0x0000
E[15:0]
Writing a ’1’ in this register enables an input pin for the corresponding bit position EDGE IO pin(s) configured as
an input to generate an interrupt if either EDGE_INTR_POS_EDGE and / or EDGE _INTR_NEG_EDGE regis-
ters has also been enabled. An EDGE pin configured as an output has no effect.
0: IO pin will not generate an interrupt
1: IO pin assigned to EDGE function and configured as an input will generate an interrupt
EDGE_INTR_POS_EDGE_0 (0x3CA) - Read/Write
Bit
15:0
Default
Description
0xFFFF
E[15:0]
Writing a ’1’ in this register enables an interrupt to be generated on the rising edge of the corresponding bit posi-
tion EDGE IO pin(s) configured as an input if the EDGE_INTR_MASK register is enabled for that pin. If the
EDGE_INTR_NEG_EDGE register is also enabled, interrupts will be generated on both edges. Writing to an
EDGE pin configured as an output has no effect.
0: IO pin will not generate an interrupt on rising edge
1: IO pin assigned to EDGE function and configured as an input will generate an interrupt on rising edge if cor-
responding EDGE_INTR_MASK bit is set
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Rev 1B