83Plus:Ports:2F
From WikiTI
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. This port controls that amount time.
Read Values
- This port reads the last vaule written to it.
Write Values
- Bits 0 and 1 control the amount time, the following values tell by how much.
- 0 = ~3.5 microseconds
- 1 = ~8 microseconds
- 2 = ~10.5 microseconds
- 3 = ~15 microseconds
- Bits 2-7: The function of these bits are unknown.
Comments
NOTE: The timings above are ROUGHLY estimated.
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 defualt, the 84+(SE) has this port set to 4B as defualt.
Credits and Contributions
- James Montelongo
