topic Re: S08QE8 with External Oscillator in 8-bit Microcontrollers

S08QE8 with External Oscillator

MatthewScott_DE — Wed, 11 Jan 2012 00:03:42 GMT

I am designing with the 16 pin S08QE8 and plan to use an external oscillator (not a crystal or resonator). Do I drive the EXTAL pin with the oscillator output and leave the XTAL pin hanging or is there another setup that should be used?

Thank you very much for your time

Re: S08QE8 with External Oscillator

rocco — Wed, 11 Jan 2012 04:27:04 GMT

Hi Matthew Scott,

Welcome to the forum.

Do I drive the EXTAL pin with the oscillator output and leave the XTAL pin hanging?

Yes.

Re: S08QE8 with External Oscillator

bigmac — Wed, 11 Jan 2012 08:03:04 GMT

Hello,

An additional consideration may be, that if ICSC2_EREFS bit is set to zero, the XTAL pin should be available as GPIO.

Regards,

Mac

Re: S08QE8 with External Oscillator

rocco — Wed, 11 Jan 2012 08:21:02 GMT

bigmac wrote:

An additional consideration may be, that if ICSC2_EREFS bit is set to zero, the XTAL pin should be available as GPIO.

Good point. You do not need to "leave it hanging". You can do something useful with it.

Re: S08QE8 with External Oscillator

MatthewScott_DE — Fri, 13 Jan 2012 23:49:11 GMT

Thank you both very much