Difference between revisions of "83Plus:Ports:4A"

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(Created page with '4A - D+ Control D+ Control {{84P-Only Port|0A}} == Synopsis == '''Port Number:''' 4A '''Function:''' D+ Co…')
 
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* Bit 3: If set, D+ is forced high. Max 0.79 mA.
 
* Bit 3: If set, D+ is forced high. Max 0.79 mA.
 
* Bit 4: Only significant if bit 3 is set. If this is set, D+ gets extra power. Max total 1.52 mA.
 
* Bit 4: Only significant if bit 3 is set. If this is set, D+ gets extra power. Max total 1.52 mA.
* Bit 5: Unknown
+
* Bit 5: Reset means D− is getting 0.05 V at 15μA.
 
* Bit 6: Always 0
 
* Bit 6: Always 0
 
* Bit 7: Always 0
 
* Bit 7: Always 0
Line 20: Line 20:
 
=== Write Values ===
 
=== Write Values ===
 
* Bits 0-2: No effect
 
* Bits 0-2: No effect
* Bit 3: Set to force D+ high. Max output: 0.79
+
* Bit 3: Set to force D+ high. Max output: 0.79 mA.
 
* Bit 4: If bit 3 is set. Setting this give D+ extra power. Max total output 1.52 mA.
 
* Bit 4: If bit 3 is set. Setting this give D+ extra power. Max total output 1.52 mA.
* Bit 5: The OS insists that this is set.
+
* Bit 5: Resetting this gives D− 0.05 V at 15μA.
 
* Bits 6-7: No effect
 
* Bits 6-7: No effect
  
 
== Comments ==
 
== Comments ==
 
If you don't like USB protocol, you could try to use this port for communication, or for sound. Anyways, when you are done, output 20h.
 
If you don't like USB protocol, you could try to use this port for communication, or for sound. Anyways, when you are done, output 20h.

Revision as of 15:50, 3 June 2011

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 0A. On the TI-83 Plus Silver Edition, this port has no effect.

Synopsis

Port Number: 4A

Function: D+ Control

Using this port, you can control the D+ USB line. The USB controller doesn't even have to be powered.

Read Values

  • Bit 0: Set if connected to computer.
  • Bit 1: Set if not connected to computer. Flashes when talking to computer.
  • Bit 2: Set if not connected to computer.
  • Bit 3: If set, D+ is forced high. Max 0.79 mA.
  • Bit 4: Only significant if bit 3 is set. If this is set, D+ gets extra power. Max total 1.52 mA.
  • Bit 5: Reset means D− is getting 0.05 V at 15μA.
  • Bit 6: Always 0
  • Bit 7: Always 0

Write Values

  • Bits 0-2: No effect
  • Bit 3: Set to force D+ high. Max output: 0.79 mA.
  • Bit 4: If bit 3 is set. Setting this give D+ extra power. Max total output 1.52 mA.
  • Bit 5: Resetting this gives D− 0.05 V at 15μA.
  • Bits 6-7: No effect

Comments

If you don't like USB protocol, you could try to use this port for communication, or for sound. Anyways, when you are done, output 20h.