Pulse-Width Modulator for Motor Control (PWMMC)

FILTERED FAULT PIN

PWM(S) ENABLED

PWM(S) DISABLED (INACTIVE)

PWM(S) ENABLED

Figure 12-28. PWM Disabling in Automatic Mode

IIf prior to a vector fetch, the interrupt request latch is cleared by one of the actions listed, a CPU interrupt will no longer be requested. A vector fetch does not alter the state of the PWMs, the FFLAGx event flag, or FINTx.

NOTE

If the FFLAGx or FINTx bits are not cleared during the interrupt service routine, the interrupt request latch will not be cleared.

12.6.1.3 Manual Mode

In manual mode, the PWM(s) are disabled immediately once a filtered fault condition is detected (logic high). The PWM(s) remain disabled until software clears the corresponding FFLAGx event bit and a new PWM cycle begins. In manual mode, the fault pins are grouped in pairs, each pair sharing common functionality. A fault condition on pins 1 and 3 may be cleared, allowing the PWM(s) to enable at the start of a PWM cycle regardless of the logic level at the fault pin. See Figure 12-29. A fault condition on pins 2 and 4 can only be cleared, allowing the PWM(s) to enable, if a logic low level at the fault pin is present at the start of a PWM cycle. See Figure 12-30.

The function of the fault control and event bits is the same as in automatic mode except that the PWMs are not re-enabled until the FFLAGx event bit is cleared by writing to the FTACKx bit and the filtered fault condition is cleared (logic low).

FILTERED FAULT PIN 1 OR 3

PWM(S) ENABLED

 

PWM(S) DISABLED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FFLAGX CLEARED

PWM(S) ENABLED

Figure 12-29. PWM Disabling in Manual Mode (Example 1)

MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1

140

Freescale Semiconductor

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Freescale Semiconductor MC68HC908MR32, MC68HC908MR16 manual PWM Disabling in Automatic Mode, Manual Mode
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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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