在PIC18F2xK20,MCU可以用內部的 OSC.搭配PLL來跑到64MHZ(16MIPS),但在SCS的選則要注意不能選1x,否則PLL是無開啟的
bit 1-0 SCS<1:0>: System Clock Select bits
1x = Internal oscillator block
01 = Secondary (Timer1) oscillator
00 = Primary clock (determined by CONFIG1H[FOSC<3:0>])..............//can enable PLL
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