[quote userid="91011" url="~/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1483055/tm4c123gh6pm-mosc-crystal-frequency-selection-for-the-tivac"]In my custom circuit, I have a 20mhz oscillator. What would the effects be if I use a 24mhz oscillator or even a 10mhz oscillator? Since the PLL scales it up to 80mhz, should not affect anything? Am I correct?[/quote] Your crystal as an input source for the PLL can be between 5Mhz to 25Mhz. If you look at the sysctl.h file, 16, 20 and 24Mhz are supported. 80Mhz System clock can be achieved using these crystal frequencies. [quote userid="91011" url="~/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1483055/tm4c123gh6pm-mosc-crystal-frequency-selection-for-the-tivac"] Could it have an effect on system peripherals such as the SPI? or ADC? [/quote] No effect. The SPI uses divided system clock for the SPICLK. ADC module can take among the internal PIOSC or System Clock.
↧