68HC11 and MAF sensor

[jimmy staton]

Hello to all, I have a question I have a MAF sensor off an 2.8L firebird it
puts out a pulse that varies
from 30hz to 150hz that = 3 to 150 grams/sec air flow according to the GM
efi training manual I have. I not 
sure how to handle the conversion in the microcode I am using a HC11 micro
and was hoping to find 
someone who knows more about programing than I do . I am very much an
amateur programer and any help
would be great.  My second question why do they convert to freq, just using
the 0 to 5 volts output
would be easier wouldn't it.  

                                   Jimmy

staton at icon.net