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Today, I try the fuction of CPUDIV in PIC18F MCU.

MCU have the faster speed in CPUDIV = OSC1 than CPUDIV = OSC4_PLL6.

今天我測試了PIC18系列MCU的CPUDIV的功能，

結果系統在CPUDIV = OSC1的運作速度比OSC4_PLL6快，


The following data is expressed in pic18 config: 

PLL // Prescaler Selection bits:
PLLDIV = 1	// No prescale (4 MHz oscillator input drives PLL directly)
PLLDIV = 2	// Divide by 2 (8 MHz oscillator input)
PLLDIV = 3	// Divide by 3 (12 MHz oscillator input)
PLLDIV = 4	// Divide by 4 (16 MHz oscillator input)
PLLDIV = 5	// Divide by 5 (20 MHz oscillator input)
PLLDIV = 6	// Divide by 6 (24 MHz oscillator input)
PLLDIV = 10	// Divide by 10 (40 MHz oscillator input)
PLLDIV = 12	// Divide by 12 (48 MHz oscillator input)

// CPU System Clock Postscaler:
CPUDIV = OSC1_PLL2	// [OSC1/OSC2 Src: /1][96 MHz PLL Src: /2]
CPUDIV = OSC2_PLL3	// [OSC1/OSC2 Src: /2][96 MHz PLL Src: /3]
CPUDIV = OSC3_PLL4	// [OSC1/OSC2 Src: /3][96 MHz PLL Src: /4]
CPUDIV = OSC4_PLL6	// [OSC1/OSC2 Src: /4][96 MHz PLL Src: /6]

Cont. ~~~~~