In SX Microcontrollers, SX/B Compiler and SX-Key Tool, tdg8934 wrote:

PJ Allen,

I'm not sure what you are saying by my comment. All I mean is that the program's TimeDate() variable will not update properly unless a serial LCD is connected to one of the unused RA lines. The serial LCD can be fully powered (weird characters are present because it has not been configured in the program - also the interrupt may be the cause of that) OR the serial LCD needs to have either (+5v and the RX) OR (Ground and the RX). However, I will rebuild this simple DS1302 circuit on another solderless breadboard to see if that matters. 

BTW: I made another YouTube.com video showing how disconnecting the (ground and RX only) serial LCD causes the updated time to clear out to 00:00:01 AM    and    not the expected 12:00:05 AM (or higher clocked response). 

[url=http://www.youtube.com/watch?v=Uj3GMY8hTp8]http://www.youtube.com/watch?v=Uj3GMY8hTp8[/url]

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