![mplab xc8 how to change timer frequency code mplab xc8 how to change timer frequency code](https://docplayer.net/docs-images/40/21368589/images/18-0.jpg)
#pragma config WDTPS = 256 // Watchdog Timer Postscale Select bits (1:256) #pragma config WDT = OFF // Watchdog Timer Enable bit (WDT disabled (control is placed on the SWDTEN bit)) #pragma config VREGEN = OFF // USB Voltage Regulator Enable bit (USB voltage regulator disabled) #pragma config BORV = 0 // Brown-out Reset Voltage bits (Maximum setting 4.59V) #pragma config BOR = ON // Brown-out Reset Enable bits (Brown-out Reset enabled in hardware only (SBOREN is disabled)) #pragma config PWRT = ON // Power-up Timer Enable bit (PWRT enabled) #pragma config IESO = OFF // Internal/External Oscillator Switchover bit (Oscillator Switchover mode disabled) #pragma config FCMEN = ON // Fail-Safe Clock Monitor Enable bit (Fail-Safe Clock Monitor enabled) #pragma config FOSC = HS // Oscillator Selection bits (HS oscillator (HS)) #pragma config USBDIV = 1 // USB Clock Selection bit (used in Full-Speed USB mode only UCFG:FSEN = 1) (USB clock source comes directly from the primary oscillator block with no postscale) #pragma config CPUDIV = OSC1_PLL2// System Clock Postscaler Selection bits () #pragma config PLLDIV = 1 // PLL Prescaler Selection bits (No prescale (4 MHz oscillator input drives PLL directly)) Everthing seems to work as expected (when I touch the oscillator's pins, both LED turns on, there is a delay and then one LED turns off and the other too after a little delay that I don't know why). When the failure is detected, we go to the ISR where I turn on a LED to indicate the failure and checking OSTS bit we go to a routine that resets the PIC to restart primary oscillator. It basically do nothing but see if Oscillator is running fine. How can I fix this?Īnother question: what is Internal/External Oscillator switchover? I looked for it in google but found nothing clear. When the Oscillator Failure is detected, the PIC starts to run from internal clock (which I set to 8MHz), but in my code, _XTAL_FREQ is set to 20000000 (20MHz), so, if I try to use _delay functions, it will not match the expected time. I used WatchDog and Fail-Safe Clock Monitor sucesfully. I just started learning internal modules of PIC18F2550.