1.晶振，至于大小由你单片机时钟周期要求而决定（用于计时，与两个电容并联使用，电容大小由你的晶振决定，一般用22pF）

2.复位电路（用于复位）

3.电源（用于供电，一般用电脑的USB口供电）

4.烧制程序的口（可用串口配合MAX232配合使用，也可以做个并口输入，这个要根据你使用单片机的种类决定，比如ATC可用并口，STC一般只用串口输入等等）-Crystal, as the size of your microcontroller clock cycle requirements (for timing, and the use of two capacitors in parallel, the capacitor size determined by your crystal, the general with 22pF)

Reset circuit (for reset)

Power (for power supply, the general use of computer USB port power supply)

The mouth of the firing program (available with the MAX232 with the serial port can also be used as a parallel port input, this depends on the type of microcontroller you use, such as ATC available parallel port, STC generally only use serial input, etc.)