Difference between revisions of "83Plus:Ports:29"
From WikiTI
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=== Usage === | === Usage === | ||
| − | + | When Bit 1 is set the effects of speed adjustment port 2E can be seen. | |
Bits 2-7 control the amount of delay added at specified instructions. To calculate the number of clock cycles added, divide the contents of port 29 by 4 and round off. | Bits 2-7 control the amount of delay added at specified instructions. To calculate the number of clock cycles added, divide the contents of port 29 by 4 and round off. | ||
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This port is not available on the normal TI-83+. On the normal TI-83+ this port is a shadow of [[83Plus:Ports:01|Port 01h]]. | This port is not available on the normal TI-83+. On the normal TI-83+ this port is a shadow of [[83Plus:Ports:01|Port 01h]]. | ||
| − | Bits 0&1 | + | Bits 0&1 are reset on the 83+SE and set on the 84+(se). |
The effect of this port is only seen if the contents of [[83Plus:Ports:20|port 20h]] equals 00. | The effect of this port is only seen if the contents of [[83Plus:Ports:20|port 20h]] equals 00. | ||
Revision as of 02:06, 22 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 01. |
Synopsis
Port Number: 29h
Function: LCD Delay (6 MHz)
This port removes the amount of delay needed between accesses to the LCD driver by adding a delay to any instruction which reads from or writes to ports 10 or 11, as well as the mirror ports 12 and 13.
Usage
When Bit 1 is set the effects of speed adjustment port 2E can be seen.
Bits 2-7 control the amount of delay added at specified instructions. To calculate the number of clock cycles added, divide the contents of port 29 by 4 and round off.
Comments
This port is not available on the normal TI-83+. On the normal TI-83+ this port is a shadow of Port 01h.
Bits 0&1 are reset on the 83+SE and set on the 84+(se).
The effect of this port is only seen if the contents of port 20h equals 00.
