Thepenguin77 at 04:17, 28 October 2011

2011-10-28T04:17:30Z

FloppusMaximus: More USB port documentation. Port 80: device address

2010-11-12T01:24:21Z

More USB port documentation. Port 80: device address

New page

[[Category:83Plus:Ports:By Address|80 - USB Device Address]] [[Category:83Plus:Ports:By Name|USB Device Address]]
== Synopsis ==
'''Port Number:''' 80h

'''Function:''' USB Device Address

This port controls the current USB device address.

{{84P-Only Port|00}}

=== Read Values ===
* Bits 0-6: Current address
* Bit 7: Always 0

=== Write Values ===
* Bits 0-6: New USB device address
* Bit 7: Not used

== Comments ==
Since a USB system may have many devices sharing the same data lines, every peripheral device is assigned a unique 7-bit address to identify it. This port is used both to set the calculator's own address (when acting as a peripheral), and to set the address that the calculator is currently "speaking" to (when acting as a host.)

Remember that when you send or receive a Set Address request, the status stage still uses the old address (see section 9.4.6 of the USB specification), so you shouldn't change this port until after the status stage is finished.

@@ Line 1: / Line 1: @@
 [[Category:83Plus:Ports:By Address|80 - USB Device Address]] [[Category:83Plus:Ports:By Name|USB Device Address]]
 == Synopsis ==
 '''Port Number:''' 80h
@@ Line 6: / Line 7: @@
 This port controls the current USB device address.
 === Read Values ===

83Plus:Ports:80 - Revision history

Thepenguin77 at 04:17, 28 October 2011

FloppusMaximus: More USB port documentation. Port 80: device address