INS-ANI said:what does pull-up means in case of I/O ports?
(Moderator: Would you please declare this thread as microcontroller elementry question thread. It will help most of us newcomers.)
dck said:if the signal is already driven high for example, will the pull-up resistor have any effect on the voltage?
thx..
dck said:can anyone explain in general the usage of parallel and serial comm in micro controller?? jus a brief concept will do..
sivamit said:INS-ANI said:what does pull-up means in case of I/O ports?
(Moderator: Would you please declare this thread as microcontroller elementry question thread. It will help most of us newcomers.)
A pull-up resistor is used to "pull-up" a signal to prevent it from floating or creating an undefined state. Typically a digital input might be looking for a ground or low ....
https://en.wikipedia.org/wiki/Pull-up_resistor
INS-ANI said:Serial com is used for long distance communication. It has 2 pins, one of which sends the data part by part, other is GND.
for parallel communication, length of wire is limited.(ex: printer), and all the bits are transmitted simeltaneously.
Also, the system uses parallel to serial or serial to parallel shift register as and when required.
a uC can work with both of the systems, its for the developed to decide what are his requirements.
hope it helps.
try to read mazidi, it has a chapter on it.
hope it helps.
Added after 6 minutes:
sivamit said:INS-ANI said:what does pull-up means in case of I/O ports?
(Moderator: Would you please declare this thread as microcontroller elementry question thread. It will help most of us newcomers.)
A pull-up resistor is used to "pull-up" a signal to prevent it from floating or creating an undefined state. Typically a digital input might be looking for a ground or low ....
https://en.wikipedia.org/wiki/Pull-up_resistor
thanks, especially the wiki link was very informative.
here's other question:
in mazidi, many time the author has mentioned IBM PC, or IBM PC keyboard.
whats the history behind this.
also, i am interested in buying a 8051 uc for learning purpose. would u suggest any two makes, one with inbuilt programmer, inbuilt ADC or any other feature so that it is easy to use.
and another one with no advance feature.
I dont remember now..INS-ANI said:can u mention any other makes with insuilt programmer. this is incase i cant find the ADuc832 in store.
i guess atmel or philips had some makes with in built programmer. do u know which series it is?
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