Advanced Parallel I/O - The HCS12/9S12: An Introduction to Software and Hardware Interfacing - page 351

S S

C4 C4 Rotor

Rotor

N N

N

S

N S

N S

N

C2 C1 C2 C1

S

S

S

C3

C3

Step 2

Step 1

N

N

N

C4

C4

Rotor

Rotor

S

N N N

N S N S S S S

C2 C2

C1

C1

N

C3

Step 4

C3

Step 3

S

N

N

Rotor

C4

Rotor

C4

S

S

N

S N

S

N

S

C1

C2

C2 C1

N

N

C3

C3

Step 6

Step 5

S

S

S

Rotor

C4 Rotor

C4

N

S N S N S N S N S N

C2

C1

C2

C1

S

C3

C3

Step 8

N

Step 7

Figure 7.39 ■ Half-step operation of the stepper motor