UPD360 datasheet(199/221 Pages) MICROCHIP

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 2016-2017 Microchip Technology Inc.

DS00002084C-page 199

UPD360

14.4.3

HPD INTERRUPT ENABLE REGISTER (HPD_INT_EN)

14.4.4

HPD EVENT QUEUE REGISTER (HPD_QUEUE)

This register implements a circular queue that records HPD events detected by the device.

As an event is detected, it is written into the next HPD Event status field that is available and initially starts at HPD Event

0 out of reset.

After this register is read, any entries with a valid HPD event field are cleared when software writes 01b into the respec-

tive locations. The device will keep track of the last valid entry and store the next received event into the next entry. For

example, if entries 0 and 1 are valid, the device will always place the next event into location 2, regardless of whether

or not entries 0 and 1 have been cleared by software.

The device will only add entries to empty fields. After writing to HPD Event 3, the device will write the next event into

HPD Event 0, if available.

Each field is encoded as follows.

• 00b: HPD event field is empty

• 01b: HPD_HIGH Detected

• 10b: HPD_LOW Detected

• 11b: HPD_IRQ Detected

When HPD Enable is set to 0b and/or HPD Configuration is set to 1b, this register will always read 00h.

After four HPD events are recorded, any future HPD events shall be ignored until HPD event locations are freed up by

software.

Address:

0C02h

Size:

8 bits

BITS

DESCRIPTION

TYPE

DEFAULT

7:4

RESERVED

3:0

HPD Interrupt Enable

When “0”, prevents generation of the respective interrupt.

R/W

Address:

0C03h

Size:

8 bits

BITS

DESCRIPTION

TYPE

DEFAULT

7:6

HPD Event 3

R/WC

00b

5:4

HPD Event 2

R/WC

00b

3:2

HPD Event 1

R/WC

00b

1:0

HPD Event 0

R/WC

00b

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