|This port only exists on the the TI-84 Plus and the TI-84 Plus Silver Edition. On the standard TI-83 Plus, it acts as a shadow of port 02. On the TI-83 Plus Silver Edition, this port has no effect.|
Port Number: 52h
Function: Charge pump enable timer
This has something to do with the timing of when the charge pump is enabled. Timed like port 51.