1,Can I not use 7 8 47 pin EEPROM? What is the main information stored inside?
2, MODE is low：the APLL output clock is selected as the clock source to drive the internal core of the chip and 6-MHz crystal or oscillator can used
MODE is high：XTAL1/CLK48 is selected as the clock source and 48-MHz oscillator
What are the purposes of these two modes?
3,What are the purposes of the red circle circuit
