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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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Analog to Digital Converter (ADC) on ATMega8535
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ATmega8535 provides the ADC with a resolution of 10 bits. ADC is connected to 8 channel Analog Multiplexer which allows formed eight single-ended input voltage is ADC0 to ADC7. Can also be configured into seven differential input channels with ADC1 as the common terminal and the other negative as a positive voltage input. Or a second differential input channels with a choice reinforcement (gain) 10x or 200x, ie ADC1, ADC0 and ADC3, ADC2. the use of ADC atmega8535 ADC has an analog supply voltage pin separate AVCC. AVCC voltage is ± 0.3V of VCC.-
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- analog to digital converter
- atmega
- (و 23 مورد دیگر)
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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.