Oscillator frequency?

[2wrider]

Searching around the web, I seem to find a great variety of answers to the microcontrollers oscillator frequency question.

I have the following package for a V3 Microsquirt: "MC9S12C64CFA XL09S/0M66G -40°C, 85°C 48LQFP 25MHz C128 die 64K 4K 31", which indicates a bus speed of 25MHz. As the bus clock = oscillator clock / 2, it would seem the oscillator frequency is 50MHz.

Though, looking at the chip's feature summary I see:

"— 32MHz equivalent to 16MHz bus speed for single chip
— 32MHz equivalent to 16MHz bus speed in expanded bus modes
— Option of 9S12C Family: 50MHz equivalent to 25MHz bus speed
— All 9S12GC Family members allow a 50MHz operating frequency."

So, now I'm a bit confused is it 32MHz or 50MHz

Any help would be much appreciated!

Marty

[2wrider]

Of course, it looks like there may be an 8MHz oscillator on the board .... but, what do I know, I'm a software guy.