Pretty sure the answer is "Yes", but let me ask it anyway....
Situation: Need to add a datalogger to an existing design, but there are no free ports left on the microcontroller.
The microcontroller is an AT89LP51ED2. (An 8-bit, 8051 variant) Port-0 outputs data ONLY to (3) D-Type transparent octal latches (74ACT573N), which are individually latched via some pins on Port-2 of the microcontroller.
The latches are written infrequently, and are never left un-latched in normal operation (i.e., we don't use the "transparent" feature of this part).
So....
Can I use a couple of Port-0 port pins for I2C SDA & SCL lines to connect up some parts to make a datalogger? (I'm thinking a 24C32 for the memory, and DS3231 for the RTC.)
It seems to me that as long as the 573 latches are latched with the intended data, I can then do whatever I want with the Port-0 pins (such as service a RTC & Memory datalogger).
All the voltages are OK (+5 VDC is used everywhere in this particular product).
So other than adjusting the code, is there anything I'm missing?
Thanks for looking / confirming this will work. (?)