Pulse-width modulation (PWM) can be implemented on the Arduino in several ways. This article explains simple PWM techniques, as well as how to use the PWM registers directly for more control over the duty cycle and frequency. This article focuses on the Arduino Diecimila and Duemilanove models, which use the ATmega168 or ATmega328.
If you're unfamiliar with Pulse Width Modulation, see the tutorial. Briefly, a PWM signal is a digital square wave, where the frequency is constant, but that fraction of the time the signal is on (the duty cycle) can ....etc

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I'm using an AVR Mega 168 to generate a sine wave via pulse width modulation. My goal is to generate a sine wave with a frequency of approximately 50Hz. I understand that the PWM frequency needs to be as fast possible so its easier to attenuate in the filter. ....etc

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Sine wave can be generated using a Microcontroller by sending amplitude values of sine wave from microcontroller to a Digital to Analog Converter(DAC), then passing the output of DAC through a op-amp to get voltage signal and finally filtering the op-amp output voltage to get smooth sine wave. This method can be used with any microcontroller such as 8051, PIC, AVR etc.
The microcontroller stores the amplitude values corresponding to the sine wave. This discrete amplitude value are sent in parallel to a DAC. If for example 8 bit microcontrolle ....etc

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Microcontroller 8051 Assembly Language

Addressing Modes
Register
Direct
Register Indirect
Immediate
Relative
Absolute
Long
Indexed
Direct Addressing Mode
Although the entire of 128 bytes of RAM can be accessed using direct addressing mode, it is most often used to access RAM loc. 30 7FH.

MOV R0, 40H
MOV 56H, A
MOV A, 4 ; MOV A, R4
MOV 6, 2 ; copy R2 to R6
; MOV R6,R2 is invalid !
Register Indirect Addressing Mode
In this mode, register is used as a pointer to the data.

MOV A,@ ....etc

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Please

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regards

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