TMR1 & Button - long delay (1 min) before starting

[HenrikOlsson]

Doesn't really matter as far accuracy goes. Look at the frequency tolerance of the crystals you're considering, the one with the lowest value will be the most accurate one. But keep in mind that the TMR1 oscillator is designed specifically for low frequency crystals, typically a 32.768kHz. The datasheet for the 16F690 says DC to 200kHz.

/Henrik.

[flotulopex]

Thanks a lot, Henrik.