Figure 10 . Arithmetic blocks

the square wave supplied by one Hall sensor. The period is measured by counting the time between a

positive edge and the following negative edge of the H2 sensor signal.

A flag is used to select the edge. If the coming edge is positive, the Timer peripheral will be started. If

negative, the current Timer counter value will be read and the Timer stopped.

Before to escape from Ext_Int routine two assembler blocks will set the edge select mask in order to

sense the proper next edge.

Figure 11. External Interrupt Routine

®

Brushless Motor Fuzzy Control by using ST52x301

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