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Up: 9.1.2 Servo Motor
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Sets length of servo control pulse. Value is the time in
half-microseconds of the positive portion of a rectangular wave that
is generated on the PA7 pin for use in controlling a servo motor.
Minimum allowable value is 1400 (i.e., 700 
sec); maximum is 4860.
Function return value is actual period set by driver software.
Fred G. Martin
Fri Mar 29 17:44:15 EST 1996