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Chapter 43 Stepper Motor Controller
1.Overview
Chapter 43 Stepper Motor Controller
1. Overview
The stepping motor controller consists of PWM pulse generators, motor drivers, selector logic
circuits and A/D converter inputs.
The four motor drivers have a high-output driving capability and two motor coils can be connect-
ed directly to four pins. The motor rotation is designed to be controlled by a combination of the
PWM pulse generators and selector logic circuits. The synchronization mechanism enables
synchronous operation of two PWM pulse generators.
■ Block Diagram of Stepping Motor Controller
Figure 1-1 Stepping Motor Controller with A/D Converter Function
Remark: The SMC channels 0, 1, 2 and 3 are shared with ADC inputs.
PWM2 pulse generator
PWM1 pulse generator
CK
EN PWM
PWM1 compare register PWM1 selection
register
Selector
Output
enable
PWM1P
PWM1M
Output
enable
PWM2P
load
BS
PWM2M
Selector
CK
EN
PWM
PWM2 compare register PWM2 selection register
P27.3/AN19/SMC2M0
P27.2/AN18/SMC2P0
P27.1/AN17/SMC1M0
P27.0/AN16/SMC1P0
Port 27
PWM control register
PFR27
CE bit
SC bit
PWM
Clock
Prescaler
Decoder
A/D conversion
channel setting
register
A/D converter
input
P26.x/ANx
P27.x/ANx
P28.x/ANx
P29.x/ANx
Peripheral
clock
CLKP
SMC channel 0 (ADC input)
