Difference between revisions of "83Plus:Ports:29"
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| − | [[Category:83Plus:Ports:By Address|29 - LCD | + | [[Category:83Plus:Ports:By Address|29 - LCD Delay (6 MHz)]] [[Category:83Plus:Ports:By Name|LCD Delay (6 MHz)]] |
{{SE-Only Port|01}} | {{SE-Only Port|01}} | ||
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'''Port Number:''' 29h | '''Port Number:''' 29h | ||
| − | '''Function:''' LCD | + | '''Function:''' LCD Delay (6 MHz) |
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| + | 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 [[83Plus:Ports:10|10]] or [[83Plus:Ports:11|11]], as well as the mirror ports 12 and 13. | ||
=== Usage === | === Usage === | ||
| + | * Bit 0 enables the effects of the flash delay controlled by port 2E. | ||
| + | * Bit 1 enables the effects of the ram delay controlled by port 2E. | ||
| + | * 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. '''NOTE:''' The contents of this port should NOT be less than 0Ch or the LCD driver will no longer respond. | ||
| − | + | == Comments == | |
| + | 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 | + | 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. | ||
| − | + | As noted above, a delay less than 3 cycles causes LCD outputs to fail. However, it seems that LCD inputs (from any port) will work with a delay of 1 or more. With a delay of 0, both inputs and outputs seem to fail. Is this all a hardware glitch? Who knows. | |
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Latest revision as of 22:49, 18 February 2013
| 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
- Bit 0 enables the effects of the flash delay controlled by port 2E.
- Bit 1 enables the effects of the ram delay controlled by port 2E.
- 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. NOTE: The contents of this port should NOT be less than 0Ch or the LCD driver will no longer respond.
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.
As noted above, a delay less than 3 cycles causes LCD outputs to fail. However, it seems that LCD inputs (from any port) will work with a delay of 1 or more. With a delay of 0, both inputs and outputs seem to fail. Is this all a hardware glitch? Who knows.
