How to compute frequency when using an RC Oscilator in a PIC.. An app note from microchip says that I should use the recommended RC values from the datasheet but I've searched the datasheet from top to bottom and cannot find one.. is the computation similar to that of a 555 timer in astable op... -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist