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ARM Cortex-M3 series STM32F207VCT6 chip with 32-bit CPU 120MHz;Power Input:DC5VSD card logic voltage:3.3V or 5V, support MEGA2560 motherboard, with higher compatibilityLCD12864 mode uses EXP1, EXP2 and EXP3. EXP1 and EXP2 are LCD screen ports of normal motherboard, EXP3 is the LCD screen port used by SKR MINI E3 and SKR E3 DIP;Note:1. When using 12864 screen mode, connect the port EXP1 and EXP2 to the motherboard. (If user uses the SKR MINI E3 or SKR E3 DIP, just connect EXP3 to the motherboard.)There is no touch function in this mode.2. When using serial port screen mode, connect with TFT or aux-2 on the motherboard via RS232. This mode has touch function;3. Two work modes can be changed by one key. Press the encoder about 3 seconds until the mode selection page appears, then press the encoder after selecting the mode.