dear peoples,
I found this site very helpful.

I am working of data acquistion project,project description is.
we have read as many as 32 signal, using the atmel 8051 based Microcontroller. there are 16 different source of signal, and each source produce 2 signals,the signals are in pair(two signal for each source), which have to be read simultaneously
i designed the project as :
A------Signals-1-- to-- multiplexer1
signal-2----to -- multiplexer2
B------signals-1---to-- multiplexer1
signal-2----to -- multiplexer2
C-----Signals-1-- to-- multiplexer1
signal-2----to -- multiplexer2

.
.
.
.
P-----Signals-1--- to-- multiplexer IC
signal-2----to -- multiplexer2

then a 4 bit counters send selection for each multiplexer.
it mean when 4 bit counter send 0000 4zeros to multiplexers, data from first source will be available at its output.
and same for others souces will happen as 4 bit counter proceed

Then this data will be latched to a parrallel to serial Shift Register along with 4 bit counter values(just to have address of source)

Then at last stage, output of Parraller to serial Shift register will be taken as an input for Microcontroller on its RXD P3.0.

Micro controller hold the data and then send it to PC from its TXD pin.

Questions:
How microcontroller will receive it,
How data will be send to PC for processing
Baud rate setting issue between PC and Microcontroller through Serial port.
what a sample code should be.
And last but not least,Which SFR should be set to get and
Which pin should be GND and which should be +5

THANK YOU VERY MUCH FOR THIS LONG READING SESSION.

MANY MANY REGARDS,
RAHIL ASLAM