I have seen frequency counters for PIC's going up to 70Mhz ( 50Mhz according to specifications based on the datasheet).
For AVR - Elektor article **broken link removed** - "The microcontroller is clocked at 20 MHz, and so the counter module can be used at frequencies of up to 5 MHz without the need for a prescaler"
Also 30Mhz Frequency meter / 5 Mhz counter
I have never seen a AVR counter design reading past it's clocking frequency.
I am confused about Ubergeek63 's assertation's that "they were lying"
For AVR - Elektor article **broken link removed** - "The microcontroller is clocked at 20 MHz, and so the counter module can be used at frequencies of up to 5 MHz without the need for a prescaler"
Also 30Mhz Frequency meter / 5 Mhz counter
I have never seen a AVR counter design reading past it's clocking frequency.
I am confused about Ubergeek63 's assertation's that "they were lying"