Difference between revisions of "83Plus:Ports:86"
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* Bit 3: Unknown. | * Bit 3: Unknown. | ||
* Bit 4: Possibly set if a device has been connected (D+, or maybe D?, pulled high for some length of time.) | * Bit 4: Possibly set if a device has been connected (D+, or maybe D?, pulled high for some length of time.) | ||
| − | * Bit 5: | + | * Bit 5: This usually indicates that something was unplugged. |
* Bit 6: Unknown; probably related to HNP. | * Bit 6: Unknown; probably related to HNP. | ||
* Bit 7: This usually indicates low batteries. | * Bit 7: This usually indicates low batteries. | ||
Revision as of 11:53, 6 June 2011
Synopsis
Port Number: 86h
Function: USB Miscellaneous Events
This port reports when various device-level USB events occur.
| This port only exists on the the TI-84 Plus and the TI-84 Plus Silver Edition. On the standard TI-83 Plus, it acts as a shadow of port 06. On the TI-83 Plus Silver Edition, this port has no effect. |
Read Values
Reading from this port also clears it. Remember the value you read, because you can't go back and read it again.
- Bit 0: Possibly set if the bus has been suspended (no activity for some length of time.)
- Bit 1: Unknown; probably related to HNP and/or SRP.
- Bit 2: Set if a bus reset has occurred (both D+ and D? pulled low for some length of time.)
- Bit 3: Unknown.
- Bit 4: Possibly set if a device has been connected (D+, or maybe D?, pulled high for some length of time.)
- Bit 5: This usually indicates that something was unplugged.
- Bit 6: Unknown; probably related to HNP.
- Bit 7: This usually indicates low batteries.
Write Values
- No effect
Comments
This port is used to report various bus events, which are not associated with any particular endpoint. Note that this port (probably) only works if port 5B bit 0 is set. Port 8B might also act as a mask for this port (note that that port is normally set to A1h in host mode, and 05h in peripheral mode.)
