Hello there,
I have a MC146818 RTC which did not work !
With a HC49-S 32.768 KHz crystal I have no oscillations on pin 3 and on pin 21 (should be 31.768/4 if pin 22 FS is grounded).
My purpose is to find if the problem come from the chip or from the quartz
I have other and different crystals (cylindrical 3x8) and want to test everything on a breadboard to be more sure from where the problem come...
What is the minimal connections to do to get the MC146818 alive with clock output to pin 21 ? VSS, VCC, FS, CE, crystal circuit to pin 2-3 are sufficient ?
Regards.
Philippe