SMC03A MISCPARAMS semantics

What is MISCPARAMS frequency feedback divider semantics: if default is zero, what does it mean to divide by zero? Is it power of 2 notation as in PID dividers?

Thank you,
Paul.

Hello,

Yes, it’s a power of 2 thing, so the divider values (divisors) are 1, 2, 4, and 8 for settings of 0, 1, 2, and 3, respectively. In case you want more details, the bits get copied directly to the timer 1 prescaler on the PIC16F684, so the division is getting done in hardware, allowing for tachometer frequencies up to about 2 MHz.

- Jan