DEMO9S08QD4 Freescale Semiconductor, DEMO9S08QD4 Datasheet - Page 4

• Manufacturer Part Number: DEMO9S08QD4
• Description: BOARD DEMO FOR MC9S08QD FAMILY
• Manufacturer: Freescale Semiconductor
• Type: MCUr

Specifications of DEMO9S08QD4

• Contents: Board, Cable, CD
• Processor To Be Evaluated: MC9S08QD
• Data Bus Width: 8 bit
• Interface Type: USB
• Silicon Manufacturer: Freescale
• Core Architecture: HCS08
• Core Sub-architecture: HCS08
• Silicon Core Number: MC9S08
• Silicon Family Name: S08QD
• Rohs Compliant: Yes
• For Use With/related Products: MC9S08QD2, MC9S08QD4
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Controlling the Stepper Based on an Input Signal (PWM)
microcontrollers can drive up to 25 mA. The motor is connected directly to the microcontroller using
port A. The PWM input signal is also connected directly to the microcontroller through an input pin. Based
on the previous conditions, the electronic circuitry is minimal. See
GND, and the input signal. No external or extra electronics in the design are required.
3
To set the basis, the steps of the motor is managed by the duty cycle of a PWM input signal. The percentage
of the duty cycle allows the microcontroller to communicate the specific position.
of the implemented system.
In the automotive industry, there are several sensors or applications with a PWM signal as an output and
a result of a particular action or event. For example, there are complex temperature sensors that generate
a PWM signal as output. Another example is an electronic central unit (ECU) that measures the speed of
a vehicle and has an output pin where you can read a PWM signal. The variations of this PWM signal can
be translated into positions to indicate temperature or speed like the application described in this
document.
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Controlling the Stepper Based on an Input Signal
(PWM)
Driving a Stepper Motor Based on the MC9S08QD4 and Other 8-bit Families, Rev. 0
Figure 4. Complete Implemented System
Figure
4. The system requires VCC,
Figure 4
Freescale Semiconductor
is an example