Difference between revisions of "83Plus:Ports:2E"
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[[Category:83Plus:Ports:By Address|2E - CPU Speed Adjustment]] [[Category:83Plus:Ports:By Name|CPU Speed Adjustment]] | [[Category:83Plus:Ports:By Address|2E - CPU Speed Adjustment]] [[Category:83Plus:Ports:By Name|CPU Speed Adjustment]] | ||
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== Synopsis == | == Synopsis == | ||
Revision as of 02:48, 11 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 06. |
Contents
Synopsis
Port Number: 2Eh
Function: CPU Speed Adjustment
This port for reasons unknown has a slight effect on the CPU speed. It works in both the 6 MHz and 15 MHz modes. Every bit on the port affects the speed, but only bits 5 and 4 have any significant effects. The default value for this port is 45h on the TI-84 Plus Silver Edition and 45h on the TI-83 Plus Silver Edition.
Read Values (bits 5-4)
- 00: The CPU is running at normal speed (100%)
- 01: The CPU is running at ~82% of normal speed
- 10: The CPU is running at ~99% of normal speed
- 11: The CPU is running at ~81% of normal speed
Write Values (bits 5 and 4)
- 00: Set the CPU to run at 100% of normal speed
- 01: Set the CPU to run at ~82% of normal speed
- 10: Set the CPU to run at ~99% of normal speed
- 11: Set the CPU to run at ~81% of normal speed
Comments
This port is not available on the normal TI-83+. On the normal TI-83+ this port is a shadow of Port 0Eh.
Example
ld a,74h ;Set the CPU to ~12.09 MHz/~4.8 MHz out (2Eh),a
Credits and Contributions
- Michael Vincent: Documentation found here.
