September 20, 2012
about 2 years ago
Google “burning arduino bootloader using arduino” or check out the Arduino site http://arduino.cc/en/Tutorial/ArduinoISP for using Arduino as an ISP to burn a bootloader.
Yes as well as for all other AVR’s. From section 6.2.1 of the 328 datasheet listed above “The device is shipped with internal RC oscillator at 8.0MHz and with the fuse CKDIV8 pro-
grammed, resulting in 1.0MHz system clock.”
The MCU will run at ~1.0MHz by default, however the CKDIV8 fuse bit can be cleared to run the MCU at 8.0 MHz using only the internal RC oscillator. Also note that Atmel specifies the internal oscillator to fall with +- 10% accuracy so if you need to generate a very accurate clock signal (usually for UART transmission), an external crystal may be required.
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