Arduino mega2560 bootloader for a clock generator

Other Hardware 3rd Party Boards
1

Hello,

I have a custom designed board of Atmega2560 micro controller. As per the design, an external crystal oscillator (16MHz) was applied to the pins XTAL1 and XTAL2. The board has ICSP interface for loading the bootloader. I have loaded the arduino bootloader from the arduino IDE by the AVR ISP programmer. Everything was working and I was able to load the arduino sketches to the board successfully.

But now, the manufacturer of the board has informed me that he cannot find the crystal oscillator in the required time frame and has proposed to use a clock generator instead. Now, the question is,

  1. should the arduino boot loader fuses be programmed to accept the clock generator as the source of clock to the atmega2560 micro controller ?

  2. where can I modify the fuses while loading the bootloader from the arduino IDE ?

Thank you.

2

Somewhat surprised that no-one has answered you on this, and noted your other enquiry regarding the fuses.

Check the manual for the MCU chip. In general, if you use a clock generator instead of a crystal, you simply apply it to the XTAL1 pin and leave XTAL2 open. Most fuse settings (appropriate for an external crystal) will work in this instance, but one in particular may be recommended.