Pin Assignments

1.4.6 External Filter Capacitor Pin (CGMXFC)

CGMXFC is an external filter capacitor connection for the CGM. See Chapter 4 Clock Generator Module (CGM).

1.4.7 Analog Power Supply Pins (VDDAD and VSSAD)

VDDAD and VSSAD are the power supply pins for the analog-to-digital converter. Decoupling of these pins should be per the digital supply. See Chapter 3 Analog-to-Digital Converter (ADC).

1.4.8 ADC Voltage Decoupling Capacitor Pin (VREFH)

VREFH is the power supply for setting the reference voltage. Connect the VREFH pin to the same voltage potential as VDDAD. See Chapter 3 Analog-to-Digital Converter (ADC).

1.4.9 ADC Voltage Reference Low Pin (VREFL)

VREFL is the lower reference supply for the ADC. Connect the VREFL pin to the same voltage potential as VSSAD. See Chapter 3 Analog-to-Digital Converter (ADC).

1.4.10 Port A Input/Output (I/O) Pins (PTA7–PTA0)

PTA7–PTA0 are general-purpose bidirectional input/output (I/O) port pins. See Chapter 10 Input/Output (I/O) Ports (PORTS).

1.4.11 Port B I/O Pins (PTB7/ATD7–PTB0/ATD0)

Port B is an 8-bit special function port that shares all eight pins with the analog-to-digital converter (ADC). See Chapter 3 Analog-to-Digital Converter (ADC) and Chapter 10 Input/Output (I/O) Ports (PORTS).

1.4.12 Port C I/O Pins (PTC6–PTC2 and PTC1/ATD9–PTC0/ATD8)

PTC6–PTC2 are general-purpose bidirectional I/O port pins Chapter 10 Input/Output (I/O) Ports (PORTS). PTC1/ATD9–PTC0/ATD8 are special function port pins that are shared with the analog-to-digital converter (ADC). See Chapter 3 Analog-to-Digital Converter (ADC) and Chapter 10 Input/Output (I/O) Ports (PORTS).

1.4.13 Port D Input-Only Pins (PTD6/IS3–PTD4/IS1 and PTD3/FAULT4–PTD0/FAULT1)

PTD6/IS3–PTD4/IS1 are special function input-only port pins that also serve as current sensing pins for the pulse-width modulator module (PWMMC). PTD3/FAULT4–PTD0/FAULT1 are special function port pins that also serve as fault pins for the PWMMC. See Chapter 12 Pulse-Width Modulator for Motor Control (PWMMC) and Chapter 10 Input/Output (I/O) Ports (PORTS).

1.4.14 PWM Pins (PWM6–PWM1)

PWM6–PWM1 are dedicated pins used for the outputs of the pulse-width modulator module (PWMMC). These are high-current sink pins. See Chapter 12 Pulse-Width Modulator for Motor Control (PWMMC) and Chapter 19 Electrical Specifications.

MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1

Freescale Semiconductor

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Freescale Semiconductor MC68HC908MR16 manual External Filter Capacitor Pin Cgmxfc, Analog Power Supply Pins Vddad and Vssad
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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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