XR22804 datasheet(39/47 Pages) EXAR

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XR22804

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Rev 1B

EDGE_SET_0 (0x3C2) - Write Only

EDGE_CLEAR_0 (0x3C3) - Write Only

EDGE_STATE_0 (0x3C4) - Read/Write

EDGE_TRI_STATE_0 (0x3C5) - Read/Write

EDGE_OPEN_DRAIN_0 (0x3C6) - Read/Write

Bit

Default

Description

15:0

0x0000

E[15:0]

0: No effect

1: Set IO pin assigned to EDGE function and configured as an output to a logic ‘1’

Bit

Default

Description

15:0

0x0000

E[15:0]

0: No effect

1: Clear IO pin assigned to EDGE function and configured as an output to a logic ‘0’

Bit

Default

Description

15:0

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 17.

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.

Bit

Default

Description

15:0

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

Bit

Default

Description

15:0

0x0000

E[15:0]

Note that XR22804 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

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