Pulse-Width Modulator for Motor Control (PWMMC)

12.9.6 Dead-Time Write-Once Register

The dead-time write-once register (DEADTM) holds an 8-bit value which specifies the number of CPU clock cycles to use for the dead-time when complementary PWM mode is selected. After this register is written for the first time, it cannot be rewritten unless a reset occurs. Dead-time is not affected by changes to the prescaler value.

Address:

Read:

Write:

Reset:

$0036

 

 

 

 

 

 

 

Bit 7

6

5

4

3

2

1

Bit 0

 

 

 

 

 

 

 

 

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

 

 

 

 

 

 

 

 

1

1

1

1

1

1

1

1

Figure 12-41. Dead-Time Write-Once Register (DEADTM)

12.9.7 PWM Disable Mapping Write-Once Register

The PWM disable mapping write-once register (DISMAP) holds an 8-bit value which determines which PWM pins will be disabled if an external fault or software disable occurs. For a further description of disable mapping, see 12.6 Fault Protection. After this register is written for the first time, it cannot be rewritten unless a reset occurs.

Address:

Read:

Write:

Reset:

$0037

 

 

 

 

 

 

 

Bit 7

6

5

4

3

2

1

Bit 0

 

 

 

 

 

 

 

 

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

 

 

 

 

 

 

 

 

1

1

1

1

1

1

1

1

Figure 12-42. PWM Disable Mapping Write-Once Register (DISMAP)

12.9.8 Fault Control Register

The fault control register (FCR) controls the fault-protection circuitry.

Address:

$0022

 

 

 

 

 

 

 

 

Bit 7

6

5

4

3

2

1

Bit 0

Read:

 

 

 

 

 

 

 

 

FINT4

FMODE4

FINT3

FMODE3

FINT2

FMODE2

FINT1

FMODE1

Write:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reset:

0

0

0

0

0

0

0

0

Figure 12-43. Fault Control Register (FCR)

FINT4 — Fault 4 Interrupt Enable Bit

This read/write bit allows the CPU interrupt caused by faults on fault pin 4 to be enabled. The fault protection circuitry is independent of this bit and will always be active. If a fault is detected, the PWM pins will still be disabled according to the disable mapping register.

1 = Fault pin 4 will cause CPU interrupts.

0 = Fault pin 4 will not cause CPU interrupts.

MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1

150

Freescale Semiconductor

Page 149 Page 151
Page 150
Image 150
Freescale Semiconductor MC68HC908MR32 manual Dead-Time Write-Once Register, PWM Disable Mapping Write-Once Register
Page 149 Page 151

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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