Clock Four Crystal modes, Two External clock modes,  Two RC Oscillator, Internal oscillator, PLL…

http://www.circuitsathome.com/mcu/pic_vpp_limiter VOUT = 2.5V * ( 1 + 24/10 ) = 2.5 * 3.4 = 8.5V Newer PIC18s, such as my current favorite – PIC18F26K20, don’t like to be programmed with 12V. The datasheet maximum is 9V. Older Microchip programmers/d…