8051 Micro controller
Upon reset all port pins and port registers are high. I follow these instructions...
P0=0x00; P0=0xFF;
Now ,the result is - All P0 registers are high & all P0 pins are low.
Q1) Does this low P0 pins indicate high impedance floating load in the case of P0?
Now, I start the program with the following instruction only.
P0=0xFF;
But All P0 registers and pins remain high.
Q2)What is the difference here? What's happening inside circuitry in both cases?
if you are using one of the older derivatives that fully adhere to the original standard P0 dces not have "weak pull-up" as P1, p2 & p3