Tony Papadimitriou

9S08QG8 external oscillator problem

Discussion created by Tony Papadimitriou on Mar 30, 2007
Latest reply on Apr 3, 2007 by David Payne
Hello,

Using a 32.768KHz crystal with a 9S08QG8, I can't get it started unless I turn on ERCLKEN. This one bit in Freescale's examples is off for FEE, and I find that without it being on, there is no oscillation. ERCLKEN is supposed to be used only for providing a source for RTI, nothing else, AFAIU.

Is this a bug, a manual/reference error, or what? I've looked at these:
HCS08QRUG Rev 1, p. 16
MC9S08QG8 Rev 1.01, p. 149, section 10.4.1.2 (FEE)

which imply ERCLKEN is irrelevant for starting FEE.

The MCU is M9S08QG8, CPBE 3M77B, RMAA0545

Thanks.

Outcomes