AVR Development Board


Posted on Feb 4, 2014

The microcontroller is an AT90S8535-P in a DIP40 package. Note that this microcontroller is pin by pin, hardware compatible with other members of the analog series of AVR microcontrollers, like ATMega8535 and ATMega16. However, there are many differences between these microcontrollers. Consult the data sheets before making the replacement. The ext


AVR Development Board
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ernal clock circuit uses an 8 MHz crystal, Q1, and the capacitors C10, C11 (12 47 pF). The RESET circuit consists of the resistor R1 (10 K), and the capacitor C1 (10 F/10 V). These values are not critical, because AT90S8535 contains internal signal conditioning circuits for the RESET signal. The digital input lines are connected to PORTC, and are pulled up to V cc with resistors. A group of LEDs has been included, to show the status of each input. The idle status of the input lines is HIGH. An input line is active when pulled to GND (for example by the contact of a relay). In this case, the associated LED will light, indicating the.




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