Data transmission from the mouse to the computer is
done as
in figure 1, each clock period is usually between 70 to 150 microseconds
(10 to
25 microseconds for transitions and 30 to 50 microseconds for high or low
state), some may feel that these are large margins both this works good
since
this is a synchronous port (this also helps cut on the cost of high
precision
clocks). The data line transition is made on the falling edge of the clock
signal and is usually sampled when the clock is low. Each data packet is
composed of 11 bits, 1 start bit (which is low), 8 data bits, 1 odd parity
bit
and 1 stop bit (high).
Dunno
if thats any use ;)
DesG
Once
I have the datapath up and working I could look at the Keyboard/PS2 Mouse
protocol to see if I can program a PIC to do that task. It would depent
largely on the highest data rate that I could
achieve.
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