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XR22800

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exar.com/XR22800

Rev 1C

EDGE_PULL_DOWN (0x3C8) - Read/Write

EDGE_INTR_MASK (0x3C9) - Read/Write

Bit

Default

Description

15:8

0xFF

Reserved

These bits are reserved and should be written as ‘1’.

7:0

0xFF

E[7:0]

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

Bit

Default

Description

15:8

0x00

Reserved

These bits are reserved and should be written as ‘0’.

7:0

0x00

E[7:0]

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

Bit

Default

Description

15:8

0x00

Reserved

These bits are reserved and should be written as ‘0’.

7:0

0x00

E[7:0]

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