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July 14, 2010
about 6 years ago
I am seeking for enlightenment here.
On the “Arduino Pro 328 - 5V/16MHz” board there is an oscillator. Although in the schematic the frequency of the oscillator is not specified but I am assuming it is 16MHz as the name of the board suggested.
But the ATMega328 chip itself has an internal oscillator of 20MHz.
My questions are:
1. Why is the oscillator needed if the MCU has its own built in clock source?
2. If two clock sources with different frequencies are present, how are the functions which involved timing coordinated? (ex. serial communication, pwm generation, some arduino built in functions like pulseIn(), delay() and so on)
If someone can help me broaden my limited scope of knowledge I will greatly appreciate it.
about 7 years ago
Does anyone know if this Pocket AVR Programmer is compatible with the Arduino IDE?
I would like to use it to burn the bootloader onto an ATmega328 chip through the Arduino IDE. Is this possible?
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