Control Logic Block

NOTE

When reading this bit, the value read is the buffer value (not necessarily the value the output control block is currently using).

The IPOLx bits take effect at the beginning of the next load cycle, regardless of the state of the load okay bit, LDOK.

IPOL2 — Top/Bottom Correction Bit for PWM Pair 2 (PWMs 3 and 4)

This buffered read/write bit selects which PWM value register is used if top/bottom correction is to be achieved without current sensing.

1 = Use PWM value register 4.

0 = Use PWM value register 3.

NOTE

When reading this bit, the value read is the buffer value (not necessarily the value the output control block is currently using).

IPOL3 — Top/Bottom Correction Bit for PWM Pair 3 (PWMs 5 and 6)

This buffered read/write bit selects which PWM value register is used if top/bottom correction is to be achieved without current sensing.

1 = Use PWM value register 6.

0 = Use PWM value register 5.

NOTE

When reading this bit, the value read is the buffer value (not necessarily the value the output control block is currently using).

PRSC1 and PRSC0 — PWM Prescaler Bits

These buffered read/write bits allow the PWM clock frequency to be modified as shown in Table 12-9.

NOTE

When reading these bits, the value read is the buffer value (not necessarily the value the PWM generator is currently using).

Table 12-9. PWM Prescaler

 

 

Prescaler Bits

PWM Clock Frequency

PRSC1 and PRSC0

 

 

 

00

fOP

01

fOP/2

 

 

10

fOP/4

 

 

11

fOP/8

 

 

MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1

Freescale Semiconductor

149

Page 148 Page 150
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Freescale Semiconductor MC68HC908MR16, MC68HC908MR32 manual IPOL2 Top/Bottom Correction Bit for PWM Pair 2 PWMs 3
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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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