本帖最后由 fancychg1 于 2019-12-11 20:12 编辑
PIC24FV16KM202 内部振荡FRCPLL如何实现32MHz系统时钟工作？
需要关注与设置哪几个关键寄存器与配置字，及关键程序语句？目前我设置了FRCPLL但只观察到CLKO输出8MHz.// FBS
#pragma config BWRP = OFF // Boot Segment Write Protect (Disabled)
#pragma config BSS = OFF // Boot segment Protect (No boot program flash segment)
// FGS
#pragma config GWRP = OFF // General Segment Write Protect (General segment may be written)
#pragma config GCP = OFF // General Segment Code Protect (No Protection)
// FOSCSEL
#pragma config FNOSC = FRCPLL // Oscillator Select (Fast RC Oscillator with Postscaler and PLL Module (FRCDIV+PLL))
#pragma config SOSCSRC = DIG // SOSC Source Type (Analog Mode for use with crystal)
#pragma config LPRCSEL = HP // LPRC Oscillator Power and Accuracy (High Power, High Accuracy Mode)
#pragma config IESO = ON // Internal External Switch Over bit (Internal External Switchover mode enabled (Two-speed Start-up enabled))
// FOSC
#pragma config POSCMOD = NONE // Primary Oscillator Configuration bits (Primary oscillator disabled)
#pragma config OSCIOFNC = IO // CLKO Enable Configuration bit (CLKO output signal enabled)
#pragma config POSCFREQ = HS // Primary Oscillator Frequency Range Configuration bits (Primary oscillator/external clock input frequency greater than 8MHz)
#pragma config SOSCSEL = SOSCHP // SOSC Power Selection Configuration bits (Secondary Oscillator configured for high-power operation)
#pragma config FCKSM = CSDCMD // Clock Switching and Monitor Selection (Both Clock Switching and Fail-safe Clock Monitor are disabled)
// FWDT
#pragma config WDTPS = PS32768 // Watchdog Timer Postscale Select bits (1:32768)
#pragma config FWPSA = PR128 // WDT Prescaler bit (WDT prescaler ratio of 1:128)
#pragma config FWDTEN = OFF // Watchdog Timer Enable bits (WDT enabled in hardware)
#pragma config WINDIS = OFF // Windowed Watchdog Timer Disable bit (Standard WDT selected(windowed WDT disabled))
// FPOR
#pragma config BOREN = BOR3 // Brown-out Reset Enable bits (Brown-out Reset enabled in hardware, SBOREN bit disabled)
#pragma config RETCFG = OFF // (Retention regulator is not available)
#pragma config PWRTEN = ON // Power-up Timer Enable bit (PWRT enabled)
#pragma config I2C1SEL = PRI // Alternate I2C1 Pin Mapping bit (Use Default SCL1/SDA1 Pins For I2C1)
#pragma config BORV = V18 // Brown-out Reset Voltage bits (Brown-out Reset set to lowest voltage (1.8V))
#pragma config MCLRE = ON // MCLR Pin Enable bit (RA5 input pin disabled, MCLR pin enabled)
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