Difference between revisions of "83Plus:Ports:2E"
From WikiTI
m (Port 0E is a shadow of 06) |
m (Forgot comment, plus defualt vaule 44h for 83se.) |
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'''Function:''' CPU Speed Adjustment | '''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 | + | 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 44h on the TI-83 Plus Silver Edition. |
=== Read Values (bits 5-4)=== | === Read Values (bits 5-4)=== | ||
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== Comments == | == Comments == | ||
| − | This port is not available on the normal TI-83+. On the normal TI-83+ this port is a shadow of [[83Plus:Ports: | + | This port is not available on the normal TI-83+. On the normal TI-83+ this port is a shadow of [[83Plus:Ports:06|Port 06h]]. |
== Example == | == Example == | ||
Revision as of 02:50, 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 44h 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 06h.
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.
