LDOK- Load OK Bit | Freescale Semiconductor MC68HC908MR16 specification

Control Logic Block

Table 12-7. Correction Methods

Current Correction Bits	Correction Method
ISENS1 and ISENS0	Correction Method
ISENS1 and ISENS0

00	Bits IPOL1, IPOL2, and IPOL3 are used for correction.
01	Bits IPOL1, IPOL2, and IPOL3 are used for correction.
01

	Current sensing on pins			and		occurs during the
10	Current sensing on pins	IS1,	IS2,	and	IS3	occurs during the
10	dead-time.
	dead-time.

	Current sensing on pins			and		occurs at the half
	Current sensing on pins	IS1,	IS2,	and	IS3	occurs at the half
11	cycle in center-aligned mode and at the end of the cycle in
	edge-aligned mode.

1.The polarity of the ISx pin is latched when both the top and bottom PWMs are off. At the 0% and 100% duty cycle boundaries, there is no dead-time, so no new current value is sensed.

2.Current is sensed even with 0% and 100% duty cycle.

NOTE

The ISENSx bits are not buffered. Changing the current sensing method can affect the present PWM cycle.

LDOK— Load OK Bit

This read/write bit loads the prescaler bits of the PMCTL2 register and the entire PMMODH/L and PWMVALH/L registers into a set of buffers. The buffered prescaler divisor, PWM counter modulus value, and PWM pulse will take effect at the next PWM load. Set LDOK by reading it when it is logic 0 and then writing a logic 1 to it. LDOK is automatically cleared after the new values are loaded or can be manually cleared before a reload by writing a 0 to it. Reset clears LDOK.

1 = Load prescaler, modulus, and PWM values.

0 = Do not load new modulus, prescaler, and PWM values.

NOTE

The user should initialize the PWM registers and set the LDOK bit before enabling the PWM.

A PWM CPU interrupt request can still be generated when LDOK is 0.

PWMEN — PWM Module Enable Bit

This read/write bit enables and disables the PWM generator and the PWM pins. When PWMEN is clear, the PWM generator is disabled and the PWM pins are in the high-impedance state (unless OUTCTL = 1).

When the PWMEN bit is set, the PWM generator and PWM pins are activated. For more information, see 12.7 Initialization and the PWMEN Bit.

1 = PWM generator and PWM pins enabled

0 = PWM generator and PWM pins disabled

MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1

Freescale Semiconductor

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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.

Freescale Semiconductor MC68HC908MR16 manual LDOK- Load OK Bit, Pwmen PWM Module Enable Bit

Models: MC68HC908MR16 MC68HC908MR32