Chapter 1

General Description

1.1 Introduction

The MC68HC908MR32 is a member of the low-cost, high-performance M68HC08 Family of 8-bit microcontroller units (MCUs). All MCUs in the family use the enhanced M68HC08 central processor unit (CPU08) and are available with a variety of modules, memory sizes and types, and package types.

The information contained in this document pertains to the MC68HC908MR16 with the exceptions shown in Appendix A MC68HC908MR16.

1.2 Features

Features include:

High-performance M68HC08 architecture

Fully upward-compatible object code with M6805, M146805, and M68HC05 Families

8-MHz internal bus frequency

On-chip FLASH memory with in-circuit programming capabilities of FLASH program memory: MC68HC908MR32 — 32 Kbytes

MC68HC908MR16 — 16 Kbytes

On-chip programming firmware for use with host personal computer

FLASH data security(1)

768 bytes of on-chip random-access memory (RAM)

12-bit, 6-channel center-aligned or edge-aligned pulse-width modulator (PWMMC)

Serial peripheral interface module (SPI)

Serial communications interface module (SCI)

16-bit, 4-channel timer interface module (TIMA)

16-bit, 2-channel timer interface module (TIMB)

Clock generator module (CGM)

Low-voltage inhibit (LVI) module with software selectable trip points

10-bit, 10-channel analog-to-digital converter (ADC)

System protection features:

Optional computer operating properly (COP) reset

Low-voltage detection with optional reset

Illegal opcode or address detection with optional reset

Fault detection with optional PWM disabling

1.No security feature is absolutely secure. However, Freescale’s strategy is to make reading or copying the FLASH difficult for unauthorized users.

MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1

Freescale Semiconductor

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Freescale Semiconductor MC68HC908MR16, MC68HC908MR32 manual Chapter General Description, Introduction, Features

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.