I'm just starting a revision of a product where we want to replace an
external RTC with a 32K crystal on the t1 oscillator pins - I'm aware
of the possible software issues but have heard mixed reports from
people using 32k crystals in various applications. 
Anyone had any good/bad experiences or hints on doing this. We'll be
using a 'F874.
Anyone have any feel for what field strengths EMC immunity might start
to become an issue with a 32K t1 osc, assuming an unshielded PCB,
2-layer with groundplane and mimal track lengths to the crystal?