Difference between revisions of "83Plus:Ports:2F"
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[[Category:83Plus:Ports:By Address|2F - LCD Wait Delay]] | [[Category:83Plus:Ports:By Address|2F - LCD Wait Delay]] | ||
[[Category:83Plus:Ports:By Name|LCD Wait Delay]] | [[Category:83Plus:Ports:By Name|LCD Wait Delay]] | ||
| − | {{SE-Only Port| | + | {{SE-Only Port|07}} |
== Synopsis == | == Synopsis == | ||
Revision as of 19:50, 27 October 2011
| 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 based on the current cpu speed and if the calculator is in hi speed mode. This port controls that amount time.
Read Values
- This port reads the last value written to it.
Write Values
- Bits 0-1 control the amount of tstates to wait when port 20 contains 1. The following values tell the number of tstates.
- 00 = 048 tstates
- 01 = 112 tstates
- 10 = 176 tstates
- 11 = 240 tstates
- Bits 2-4 control the amount of tstates to wait when port 20 contains 2. The following values tell the number of tstates.
- 000 = 048 tstates
- 001 = 112 tstates
- 010 = 176 tstates
- 011 = 240 tstates
- 100 = 304 tstates
- 101 = 368 tstates
- 110 = 432 tstates
- 111 = 496 tstates
- Bits 5-7 control the amount of tstates to wait when port 20 contains 3. The following values tell the number of tstates.
- 000 = 048 tstates
- 001 = 112 tstates
- 010 = 176 tstates
- 011 = 240 tstates
- 100 = 304 tstates
- 101 = 368 tstates
- 110 = 432 tstates
- 111 = 496 tstates
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 default, the 84+(SE) has this port set to 4B as default.
Credits and Contributions
- James Montelongo
