Outline Of Stepping Motor Controller - Fujitsu MB90390 Series Hardware Manual

CHAPTER 24 STEPPING MOTOR CONTROLLER
24.1

Outline of Stepping Motor Controller

The Stepping Motor Controller consists of two PWM Pulse Generators, four motor
drivers and the corresponding Selector Logic. The four motor drivers have high output
drive capabilities and they can be directly connected to the four ends of two motor
coils. The combination of the PWM Pulse Generators and Selector Logic is designed to
control the rotation of the motor. A Synchronization mechanism assures the
synchronous operations of the two PWMs. The MB90390 series provides 6 separate
Stepping Motor Controllers.
■ Block Diagram of Stepping Motor Controller
Machine Clock
Prescaler
P1 P0
CE
522
Figure 24.1-1 Block Diagram of Stepping Motor Controller
CK
PWM1 pulse generator
EN
PWM1 Compare register
CK
PWM2 pulse generator
EN
PWM2 Compare register
Selector
PWM
PWM1 Select register
Selector
PWM
Load
BS
PWM2 Select register
Output enable
OE1
PWM1P0
PWM1M0
Output enable
OE2
PWM2P0
PWM2M0