Pulse-Width Modulator for Motor Control (PWMMC)

UP/DOWN COUNTER

MODULUS = 4

DEAD-TIME = 2

PWM VALUE = 3

OUTCTL

OUT1

OUT2

PWM1

PWM2

PWM1/PWM2

DEAD-TIME

2

DEAD-TIME INSERTED AS PART OF NORMAL PWM OPERATION AS CONTROLLED BY CURRENT SENSING AND PWM GENERATOR

2

DEAD-TIME INSERTED DUE TO SETTING OF OUT1 BIT

2

DEAD-TIME INSERTED

DUE TO CLEARING OF

OUT1 BIT

UP/DOWN COUNTER

MODULUS = 4 DEAD-TIME = 2 PWM VALUE = 3

OUTCTL

OUT1

OUT2

PWM1

PWM2

PWM1/PWM2

DEAD-TIME

Figure 12-23. Dead-Time Insertion During OUTCTL = 1

 

 

 

 

 

 

 

 

 

 

2

 

2

 

 

 

2

 

 

 

2

 

 

 

 

 

 

 

 

NO DEAD-TIME INSERTED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DEAD-TIME INSERTED BECAUSE

DEAD-TIME INSERTED

 

 

 

WHEN OUTCTL WAS SET, THE

BECAUSE OUT1 TOGGLES,

BECAUSE OUT1 IS NOT

 

 

 

STATE OF OUT1 WAS SUCH THAT

DIRECTING PWM1 TO

TOGGLING

 

 

 

PWM1 WAS DIRECTED TO TOGGLE

TOGGLE

 

 

 

 

Figure 12-24. Dead-Time Insertion During OUTCTL = 1

MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1

136

Freescale Semiconductor

Page 135 Page 137
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Image 136
Freescale Semiconductor MC68HC908MR32, MC68HC908MR16 manual Dead-Time Insertion During Outctl =
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MC68HC908MR16, MC68HC908MR32 specifications

Freescale Semiconductor's MC68HC908MR32 and MC68HC908MR16 microcontrollers are part of the popular HC08 family, designed primarily for embedded applications. These microcontrollers are particularly favored in automotive, industrial, and consumer product sectors due to their reliability and versatility.

One of the standout features of the MC68HC908MR series is its CMOS technology, which enhances performance while minimizing power consumption. This makes these microcontrollers suitable for battery-operated devices. They operate at a maximum clock frequency of 2 MHz and offer a 16-bit architecture, providing a solid balance between processing power and efficiency.

The MC68HC908MR32 variant is equipped with 32KB of flash memory, which allows for the storage of complex programs and extensive data handling. In contrast, the MC68HC908MR16 features 16KB of flash memory, making it ideal for simpler applications. Both microcontrollers also come with 1KB of RAM, enabling efficient data processing and real-time operations.

Another significant characteristic of these microcontrollers is their integrated peripherals. They come with multiple input/output (I/O) pins, which allow for connectivity with various sensors and actuators. The built-in timer systems offer precise timing control for automotive and industrial applications, while the Analog-to-Digital Converter (ADC) provides essential conversion capabilities for various analog signals.

For communication purposes, the MC68HC908MR series includes a serial communication interface, enabling easy integration with other devices and systems. This versatility facilitates the development of complex systems that require interaction with external components.

Security is another crucial aspect of these microcontrollers. They have built-in fail-safe mechanisms to ensure reliable operation under various conditions, making them suitable for critical systems. Additionally, their robust architecture helps to safeguard against potential disruptions or attacks.

In summary, Freescale Semiconductor's MC68HC908MR32 and MC68HC908MR16 microcontrollers are key players in the embedded systems landscape. Their blend of power efficiency, integrated features, and scalability ensures they remain relevant for a wide array of applications, making them a favored choice among engineers and developers looking for dependable solutions in a competitive market.
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