changing Crystal Frequencies Value?

[ubaid88]

Wat is benifit using crystals of higher frequency with mcus rather than default value 16 mHz for Atmega32 and 12 mHz for Pic.

[dmitri]

Wat is benifit using crystals of higher frequency with mcus rather than default value 16 mHz for Atmega32 and 12 mHz for Pic.

For PIC there is no difference. Using Atmega324 or Atmega644 at 20MHz may have a slight advantage in latency compared to Atmega32 at 16MHz of course if you adjust Latency and MinScan accordingly. With default values for Latency and MinScan there is no difference.