Difference between revisions of "83Plus:Ports:4A"
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| − | [[Category:83Plus:Ports:By Address|4A - D | + | [[Category:83Plus:Ports:By Address|4A - D− Control]] [[Category:83Plus:Ports:By Name|D− Control]] |
{{84P-Only Port|0A}} | {{84P-Only Port|0A}} | ||
== Synopsis == | == Synopsis == | ||
'''Port Number:''' 4A | '''Port Number:''' 4A | ||
| − | '''Function:''' D | + | '''Function:''' D− Control |
| − | Using this port, you can control the D | + | Using this port, you can control the D− USB line. The USB controller doesn't even have to be powered. |
=== Read Values === | === Read Values === | ||
| − | * Bit 0: Set if | + | * Bit 0: Set if 2 and 6 of [[83Plus:Ports:54|port 54]] are set, 3 of [[83Plus:Ports:4C|port 4C]] is set, and VBus is high. |
* Bit 1: Set if not connected to computer. Flashes when talking to computer. | * Bit 1: Set if not connected to computer. Flashes when talking to computer. | ||
| − | * Bit 2: | + | * Bit 2: Reset if 2 and 6 of [[83Plus:Ports:54|port 54]] are set, 3 of [[83Plus:Ports:4C|port 4C]] is set, and VBus is high. |
| − | * Bit 3: If set, D | + | * 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 | + | * 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 5: Reset means D− is getting 0.05 V at 15μA. | ||
* Bit 6: Always 0 | * Bit 6: 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 | + | * Bit 3: Set to force D− high. Max output: 0.79 mA. |
| − | * Bit 4: If bit 3 is set. Setting this give D | + | * 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. | * Bit 5: Resetting this gives D− 0.05 V at 15μA. | ||
* Bits 6-7: No effect | * Bits 6-7: No effect | ||
Revision as of 18:47, 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 2 and 6 of port 54 are set, 3 of port 4C is set, and VBus is high.
- Bit 1: Set if not connected to computer. Flashes when talking to computer.
- Bit 2: Reset if 2 and 6 of port 54 are set, 3 of port 4C is set, and VBus is high.
- 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.
