COP Block Diagram | Freescale Semiconductor MC68HC908MR16 manual

Chapter 6 Computer Operating Properly (COP)

6.1 Introduction

This section describes the computer operating properly module, a free-running counter that generates a reset if allowed to overflow. The computer operating properly (COP) module helps software recover from runaway code. Prevent a COP reset by periodically clearing the COP counter.

6.2 Functional Description

Figure 6-1shows the structure of the COP module. A summary of the input/output (I/O) register is shown in Figure 6-2.

		SIM
CGMXCLK	13-BIT SIM COUNTER		SIM RESET CIRCUIT
	CLEAR ALL BITS	CLEAR BITS 12–4	SIM RESET STATUS REGISTER
	CLEAR ALL BITS	CLEAR BITS 12–4
INTERNAL RESET SOURCES(1)
RESET VECTOR FETCH
COPCTL WRITE
	COP MODULE
		6-BIT COP COUNTER

COPD (FROM CONFIG)

RESET

COPCTL WRITE

CLEAR

COP COUNTER

Note 1. See 14.3.2 Active Resets from Internal Sources.

Figure 6-1. COP Block Diagram

MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1

Freescale Semiconductor

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 Chapter Computer Operating Properly COP, COP Block Diagram

Models: MC68HC908MR16 MC68HC908MR32

Chapter 6

Computer Operating Properly (COP)