PIC18F45K22外部晶振不工作

只看该作者 · 2015-9-25 14:06

PIC18F45K22
外部晶振是20MHz，电容是22p
配置位：#pragma config FOSC = XT       // Oscillator Selection bits (XT oscillator)
#pragma config PLLCFG = OFF    // 4X PLL Enable (Oscillator used directly)
#pragma config PRICLKEN = ON // Primary clock enable bit (Primary clock is always enabled)
#pragma config FCMEN = OFF    // Fail-Safe Clock Monitor Enable bit (Fail-Safe Clock Monitor disabled)
#pragma config IESO = ON       // Internal/External Oscillator Switchover bit (Oscillator Switchover mode enabled)

寄存器
OSCCON和OSCCON2使用默认值

但是就一直不工作在外部晶振，都是在内部晶振工作

请高手指点下，哪里还需要设定吗？

谢谢！