External Crystal = 32 kHz, Maximum bus Frequency

[WillemEradus]

I have an evolution board with a MC9S08LC60 and an external crystal of 32 kHz. In the example, the FLL will be used (in FEE mode) to multiply the external 32 kHz oscillator up to 8.38MHz to achieve 4.19 MHz bus frequency.  My question is what is the maximum bus frequency I can achieve with this setup.

Thx, Willem. 

[peg · Accepted solution]

Hello and welcome to the fora, Willem.

In your example the multiplier used is 4.

The maximum multiplier available is 18

4.19 * 18 / 4 = 18.8MHz

Refer to datasheet Chapter 10, ICG for more details .

[WillemEradus]

thanks !