Difference between revisions of "83Plus:Ports:2F"
From WikiTI
(Remaining bits plus more accurate timing) |
m (Minor mistake) |
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=== Write Values === | === Write Values === | ||
| − | * Bits | + | * Bits 0-1 contorl the amount of time when port 20 contains 1. The following values tell the amount of time. |
** 00 = ~3.2 microseconds | ** 00 = ~3.2 microseconds | ||
** 01 = ~7.4 microseconds | ** 01 = ~7.4 microseconds | ||
Revision as of 05:47, 23 August 2005
| This port only exists as a distinct port on the TI-83 Plus Silver Edition, the TI-84 Plus, and the TI-84 Plus Silver Edition. On the standard TI-83 Plus, it acts as a shadow of port 07. |
Synopsis
Port Number: 2Fh
Function: LCD Wait Delay
After every write to the LCD bit 1 of port 2 resets for a certain amount of time. This port controls that amount time.
Read Values
- This port reads the last vaule written to it.
Write Values
- Bits 0-1 contorl the amount of time when port 20 contains 1. The following values tell the amount of time.
- 00 = ~3.2 microseconds
- 01 = ~7.4 microseconds
- 10 = ~11.7 microseconds
- 11 = ~16.0 microseconds
- Bits 2-4 contorl the amount of time when port 20 contains 2. The following values tell the amount of time.
- 000 = ~3.2 microseconds
- 001 = ~7.4 microseconds
- 010 = ~11.7 microseconds
- 011 = ~16.0 microseconds
- 100 = ~20.2 microseconds
- 101 = ~24.5 microseconds
- 110 = ~28.8 microseconds
- 111 = ~33.0 microseconds
- Bits 5-7 contorl the amount of time when port 20 contains 3. The following values tell the amount of time.
- 000 = ~3.2 microseconds
- 001 = ~7.4 microseconds
- 010 = ~11.7 microseconds
- 011 = ~16.0 microseconds
- 100 = ~20.2 microseconds
- 101 = ~24.5 microseconds
- 110 = ~28.8 microseconds
- 111 = ~33.0 microseconds
Comments
This value really shouldn't be changed. TI-OS depends on this being set high enough to function for the LCD delay.
Also the 83+SE has this port set to 4A as defualt, the 84+(SE) has this port set to 4B as defualt.
Credits and Contributions
- James Montelongo
