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timer digital To create a realtime timer, realtime microcontroller is not required (RTC). You only need a crystal and a timer prescale settings. for example, if used for 8MHz crystal, then choose the timer prescale of 8. Prescale is a divisor which will be conditional on crystal beats as needed. timer frequency = frequency of crystal / prescale so, timer frequency = 1MHz since T = 1 / F, then T = 1US This means that every single wave oscillation takes 1US. To simplify the calculation, the timer0 registers (TCNT0) shall be 155. TCNT0 then oscillates between 155 to 255. so that any overflow occurs, the timer has counted 100us. when made variable “x” to be in increments of each of the Overflow occurs when x = 10, the timer value is 1ms. and if each x = 10 will raise the value of variable “y”, then “y” is the timer value in ms. (In experiments conducted used ATMega8535 with 8MHz crystal).
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atmega128 ATMEGA 128 (AVR) is a microcontroller that has been equipped for 4Kbyte in its chip EEPROM. EEPROM is separate from the AVR flash memory, and can be written, read per byte. To be able to access the EEPROM it needs to manage registers and fuse bit. To prevent errors in the writing and reading of EEPROM cultivated power supply that is used quite stable. When reading the EEPROM microcontroller stops during the four clock cycles before doing the next command, and to write EEPROM microcontroller’s clock stopped during the second cycle before doing the next command.
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AVR Studio یک نرم افزار رایگان برای دیباگ کردن نوشتن برنامه اسمبلی برای AVR های شرکت Atmel است که می توانید آنرا از سایت این شرکت (www.atmel.com) دریافت کنید. از این نرم افزار به غیر از دیباگ کردن برای نرم افزارهایی که فرمت های COFF را مانند Codevision پشتبانی می کنند استفاده کنید (از ورژن 4.06 به بعد) با این روش می توانید برنامه نوشته شده به زبان مثلاً C را داخل AVR Studio دیباگ کنید. تهیه کننده: هادی رامین زاده دانلود آموزش AVR Studio
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