By Steven Barrett
This textbook presents practising scientists and engineers a sophisticated remedy of the Atmel AVR microcontroller. This booklet is meant as a follow-on to a formerly released publication, titled Atmel AVR Microcontroller Primer: Programming and Interfacing. a few of the content material from this prior textual content is retained for completeness. This ebook will emphasize complicated programming and interfacing talents. We concentrate on process point layout which includes numerous interacting microcontroller subsystems. the 1st bankruptcy discusses the process layout approach. Our technique is to supply the abilities to fast wake up to hurry to function the the world over renowned Atmel AVR microcontroller line by means of constructing structures point layout talents. We use the Atmel ATmega164 as a consultant pattern of the AVR line. the data you achieve in this microcontroller will be simply translated to each different microcontroller within the AVR line. In succeeding chapters, we conceal the most subsystems aboard the microcontroller, supplying a brief idea part by way of an outline of the similar microcontroller subsystem with accompanying software program for the subsystem. We then offer complex examples workout many of the beneficial properties mentioned. In all examples, we use the interval. The code supplied may be without difficulty tailored to the big variety of compilers to be had for the Atmel AVR microcontroller line. We additionally comprise a bankruptcy describing tips to interface the microcontroller to a wide selection of enter and output units. The e-book concludes with numerous certain approach point layout examples utilizing the Atmel AVR microcontroller. desk of Contents: Embedded structures layout / Atmel AVR structure review / Serial conversation Subsystem / Analog to electronic Conversion (ADC) / Interrupt Subsystem / Timing Subsystem / Atmel AVR working Parameters and Interfacing / method point layout
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Additional info for Embedded Systems Design with the Atmel AVR Microcontroller: Part II (Synthesis Lectures on Digital Circuits and Systems)
Timer 2 also uses the Timer/Counter 2 Overflow Flag (TOV2) which sets when Timer/Counter 2 overflows. 158 CHAPTER 6. 14: Timer 2 registers. 9 PROGRAMMING THE TIMER SYSTEM In this section, we provide several representative examples of using the timer system for various applications. We will provide examples of using the timer system to generate a prescribed delay, to generate a PWM signal, and to capture an input event. 55 ms interrupts. 55 ms. The overflow flag is used as a “clock tick” to generate a precision delay.
This will ensure the microcontroller will continue to operate within specified parameters. Should the microcontroller be operated outside its operational envelope, erratic, unpredictable, and unreliable system may result. 1 OPERATING PARAMETERS Any time a device is connected to a microcontroller, careful interface analysis must be performed. Most microcontrollers are members of the “HC,” or high-speed CMOS, family of chips. As long as all components in a system are also of the “HC” family, as is the case for the Atmel AVR line of microcontrollers, electrical interface issues are minimal.
The current temperature is displayed on the Liquid Crystal Display (LCD). We send a 1 KHz PWM signal to a cooling fan (M) whose duty cycle is set from 50% to 90% using the potentiometer connected to PORTA. The PWM signal should last until the temperature of the LM34 cools to a value as set by another potentiometer (PORTA). When the temperature of the LM34 falls below the set level, the cooling fan is shut off. If the temperature falls while the fan is active, the PWM signal should gently return to zero, and wait for further temperature changes.
Embedded Systems Design with the Atmel AVR Microcontroller: Part II (Synthesis Lectures on Digital Circuits and Systems) by Steven Barrett