Fig. 15.1 Block Diagram Of Stepping Motor Controller - Fujitsu MB90420/5 (A) Series Hardware Manual

This chapter describes the functions and operation of the stepping motor controller.
15.1 Overview of Stepping Motor Controller
The stepping motor controller consists of two PWM pulse generators, four motor drivers, and 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.
n Block diagram of stepping motor controller
Figure 15.1 shows a block diagram of the stepping motor controller.
Machine clock
Prescaler
P1 P0
SC
CE
STEPPING MOTOR CONTROLLER
CK
PWM1 pulse generator
EN
PWM1 compare register
CK
PWM2 pulse generator
EN
PWM2 compare register

Fig. 15.1 Block Diagram of Stepping Motor Controller

Selector
PWM
PWM1 select register
Selector
PWM
Load
BS PWM2 select register
15-3
Output enable
OE1
PWM1Pn
PWM1Mn
Output enable
OE2
PWM2Pn
PWM2Mn
n: 0 to 3