Freescale Semiconductor MC68HC908QT2, M68HC08 manual Operational Description, Push Buttons, LEDs

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Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

Designer Reference Manual — DRM045

Section 2. Operational Description

2.1 Introduction

The following subsections describe the operation of the ASB520, MC68HC908QT2 infrared remote control reference design system. LEDs, switches, jumper blocks and FLASH programmer headers, and current monitor jumper block are described here. Figure 2-1shows the locations of these items.

2.2 Push Buttons

There are six push button switches resident on the lower portion of the reference PC board. They are labeled as switches SW1–SW6 on the PC board schematic. Each button has a dedicated function. The switches are labeled as POWER, PAUSE, PLAY, REVERSE, STOP, and FORWARD. These labels describe the button’s operation function related to control of a DVD player.

2.3 LEDs

There are two LEDs located in the upper right hand corner of the PC board. The LED labeled D1 is an infrared LED and the one labeled D2 is a visible red LED and is used to show system activity.

2.3.1 Red Activity Indicator LED

D2 is a visible red LED and is used to show IR LED activity. It blinks as long any push button is depressed

2.3.2 Infrared LED

D1 is an infrared LED. It is modulated to control the DVD.

Using the ASB520 MC68HC908QT2 Based Infrared Remote Control Reference PC Board

DRM045

 

 

 

MOTOROLA

Operational Description

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Contents Freescale Semiconductor, Inc M68HC08Freescale Semiconductor, Inc Reference Design Revision History Table of Contents Table of Contents About this Manual Introduction and SetupIntroduction MON08 connector Setup GuideIntroduction and Setup Setup Guide Freescale Semiconductor, Inc LEDs Operational DescriptionPush Buttons JP1 JP2 JP3 Header and Jumpers Blocks Microcontroller Current Monitor Jumper Block Pin Description 16-Pin Connector J1Pin Description Schematic Schematic and Parts ListSemiconductor, Inc Reference PC Board Parts List Parts ListFreescale Semiconductor, Inc Infrared and Visible LED Drive Circuit Design ConsiderationsGrounding Design Considerations Switch CircuitrySwitch Input A/D Values Freescale Semiconductor, Inc Flash Programming System TestingHardware/Software Testing Summary LED and Push Button Test Code System TestingDVD Player Control Test Freescale Semiconductor, Inc Freescale Semiconductor, Inc HOW to Reach US
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MC68HC908QT2, M68HC08 specifications

Freescale Semiconductor, known for its innovative solutions in the field of embedded systems, developed the M68HC08 microcontroller family, which includes the MC68HC908QT2. This 8-bit microcontroller is engineered to meet the demands of diverse applications, including automotive, industrial, and consumer electronics.

The MC68HC908QT2 is designed around Freescale’s M68HC08 core, which is renowned for its efficient and reliable performance. This microcontroller integrates a powerful instruction set, enabling developers to create high-performance applications with relatively low power consumption. The device operates at a clock frequency of up to 3 MHz, which is adequate for various control tasks.

One of the key features of the MC68HC908QT2 is its memory architecture. It includes a 2 KB Flash memory for program storage, representing a significant advantage for developers requiring non-volatile memory. Additionally, it encompasses 128 bytes of EEPROM memory, allowing for data retention even after power loss. The microcontroller also has 256 bytes of RAM for efficient data manipulation during operation.

In terms of input/output capabilities, the MC68HC908QT2 supports a variety of interfacing options. The microcontroller features up to 20 general-purpose I/O pins for flexibility in connecting with peripheral devices. Additionally, it provides multiple analog-to-digital converters (ADC) and timers that facilitate efficient analog signal processing and precise control through timing functions.

The architecture of the MC68HC908QT2 also incorporates sophisticated on-chip peripherals, enhancing its functionality. These peripherals include PWM (Pulse Width Modulation) outputs, which are essential for applications requiring motor control and other precise duty cycle processes. The integrated watchdog timer ensures reliable operation by resetting the system in the event of an application failure.

Moreover, the MC68HC908QT2 is equipped with an efficient power management system, enabling operation in a low-power mode, ideal for battery-powered applications. This microcontroller is packaged in a compact 28-pin dual in-line package (DIP), making it suitable for space-constrained designs.

In summary, the Freescale Semiconductor MC68HC908QT2 microcontroller is distinguished by its robust performance, extensive memory options, and versatile I/O capabilities. Its advanced features, including built-in timers, ADC, and a power management system, make it an exceptional choice for developers seeking to implement reliable and efficient embedded solutions. With its comprehensive architecture, the MC68HC908QT2 remains a popular choice in the landscape of 8-bit microcontrollers.
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