Hej Anne Ogborn. Tack fšr ditt meddelande 08:38 1999-08-28 -0700 enligt nedan:

...

>In RC mode, OSC2 pin outputs CLKOUT which has 1/4 the
>frequency of OSC1, and denotes the instruction cycle time.

It is OK to drive the OSC1 pin with an external cirquit in Xtal configuration, but in RC mode that pin is both input and output, which will probably cause some EMI and more power consumption.  I think however that it is possible and will be OK to drive it througt a resistor approx 1kohm, although it is pretty ugly.

>OK - if I can find a reasonable price can oscillator, I don't need the divide by 4
>chip. That might justify some/all of the can's price.

The HC393 in my previous letter is a cheap one.  (and have extra free counters i need, too) Of course there are a lot of cheap counters to select from.  And I believe the design is safe.  Will test it next week.

/Morgan
Morgans Reglerteknik, HŠllekŒs, 277 35 KIVIK, SWEDEN
   tel +46(0)414-446620, fax -70331,   mrt@iname.com