83Plus:Ports:54 - Revision history

Dr. D'nar at 01:16, 4 March 2020

2020-03-04T01:16:06Z

Thepenguin77 at 04:02, 28 October 2011

2011-10-28T04:02:22Z

Thepenguin77 at 01:50, 3 June 2011

2011-06-03T01:50:16Z

Thepenguin77 at 01:48, 3 June 2011

2011-06-03T01:48:49Z

Thepenguin77: Created page with '54 - USB Controller Control USB Controller Control {{84P-Only Port|14}} == Synopsis == '''Port Number:''' 5…'

2011-06-03T01:23:41Z

Created page with '54 - USB Controller Control USB Controller Control {{84P-Only Port|14}} == Synopsis == '''Port Number:''' 5…'

New page

[[Category:83Plus:Ports:By Address|54 - USB Controller Control]] [[Category:83Plus:Ports:By Name|USB Controller Control]]
{{84P-Only Port|14}}
== Synopsis ==
'''Port Number:''' 54h

'''Function:''' USB Controller Control

This port controls the USB controller. It is closely tied to [[83Plus:Ports:90|port 4C]]

=== Values ===
* Bit 0: Unknown. OS sometimes sets this along with 1, port 81.
* Bit 1: USB controller power. Reset means powered. Resetting causes a 5.67 mA increase in draw.
* Bit 2: Setting this also sets 4, port 4C. This along with 3, port 4C turn the 80-AF ports on. Causes a 1.15 mA increase in draw.
* Bit 3: Unchangeable
* Bit 4: Unknown.
* Bit 5: Unchangeable
* Bit 6: 5, port 4C is the inverse of this. Must be set to do USB stuff. Causes a 0.22 mA increase in draw.
* Bit 7: Setting this also sets 6, port 4C. Must be set to do USB stuff.

== Comments ==
Under normal conditions, you would output C4h to this port to use USB. When you are done, output 02h or suffer serious battery usage.

If 3, port 3A is set. You should first output 44h to this then follow it with C4h to use USB.

@@ Line 9: / Line 9: @@
 === Values ===
-* Bit 0: Unknown. OS sometimes sets this along with 1, port 81.
+* Bit 0: Set to enable USB suspend interrupt. You should turn off USB stuff when you get this interrupt.
-* Bit 1: USB controller power. Reset means powered. Resetting causes a 5.67 mA increase in draw.
+* Bit 1: USB controller disable. Setting this disables the 48 MHz crystal. Resetting causes a 5.67 mA increase in draw.
-* Bit 2: Setting this also sets 4, port 4C. This along with 3, port [[83Plus:Ports:4C|port 4C]] turn the 80-AF ports on. Causes a 1.15 mA increase in draw.
+* Bit 2: Manually enables USB controller. Setting this also sets 4, port 4C. This along with 3, port [[83Plus:Ports:4C|port 4C]] turn the 80-AF ports on. Causes a 1.15 mA increase in draw.
-* Bit 3: Unchangeable
+* Bit 3: Read-only. Something to do with enabling the 48 MHz crystal.
-* Bit 4: Unknown.
+* Bit 4: If set, the hardware will automatically turn itself off when appropriate.
-* Bit 5: Unchangeable
+* Bit 5: Read-only. Tells you whether the controller has automatically turned itself off.
 * Bit 6: 5, [[83Plus:Ports:4C|port 4C]] is the inverse of this. Must be set to do USB stuff. Causes a 0.22 mA increase in draw.
-* Bit 7: Setting this also sets 6, [[83Plus:Ports:4C|port 4C]]. Must be set to do USB stuff.
+* Bit 7: Setting this also sets 6, [[83Plus:Ports:4C|port 4C]]. Must be set to do USB stuff. Something to do with the charge pump.
 == Comments ==

@@ Line 1: / Line 1: @@
 [[Category:83Plus:Ports:By Address|54 - USB Controller Control]] [[Category:83Plus:Ports:By Name|USB Controller Control]]
-{{84P-Only Port|14}}
+{{84P-Only Port|04}}
 == Synopsis ==
 '''Port Number:''' 54h

@@ Line 11: / Line 11: @@
 * Bit 0: Unknown. OS sometimes sets this along with 1, port 81.
 * Bit 1: USB controller power. Reset means powered. Resetting causes a 5.67 mA increase in draw.
-* Bit 2: Setting this also sets 4, port 4C. This along with 3, port 4C turn the 80-AF ports on. Causes a 1.15 mA increase in draw.
+* Bit 2: Setting this also sets 4, port 4C. This along with 3, port [[83Plus:Ports:54|port 4C]] turn the 80-AF ports on. Causes a 1.15 mA increase in draw.
 * Bit 3: Unchangeable
 * Bit 4: Unknown.
 * Bit 5: Unchangeable
-* Bit 6: 5, port 4C is the inverse of this. Must be set to do USB stuff. Causes a 0.22 mA increase in draw.
+* Bit 6: 5, [[83Plus:Ports:54|port 4C]] is the inverse of this. Must be set to do USB stuff. Causes a 0.22 mA increase in draw.
-* Bit 7: Setting this also sets 6, port 4C. Must be set to do USB stuff.
+* Bit 7: Setting this also sets 6, [[83Plus:Ports:54|port 4C]]. Must be set to do USB stuff.
 == Comments ==