Hello everyone i want to know that why there are pull up resistors with only port-0 and rest ports have internally connected resistors.
1) some derivatives are different 2) because that is how the chip was designed (wired OR bus capable)
Erik
i want to know that why there are pull up resistors with only port-0
The 8051 was designed in 1980-1981. Things were different way back then.
Jon
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