Service_USB 33 - USB host controller driver Hub status change
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## Name

Service_USB 33 - USB host controller driver Hub status change — Broadcast by an USB host controller driver to inform other applications about events inside USB host controller driver Hubs.

## On Entry

R0 | 33 (reason code)
R1 | &80C00 (USB Service call)

## On Exit

R0 | preserved
R1 | preserved to pass on (do not claim)
R2, R3, R4 | preserved

## Use

### Warning

Do not use.

Service is not implemented. Use USB messaging system for this functionality.

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Service_USB 32 - HUB state changed | Home | Appendix C. Commands