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AM3352 after power on、 lcd<6> have 1.2v output

Hello!

Lcd bus did not connect any symbol,only pull up or  pull done.  But  lcd <6> have 1.2v output .

system cannot work,serial port 0  no  print  message.

where 1.2v come from?

  • 这里可以发中文的。

    首先LCD_data6这个数据线来说,在上电的时候必须要有上拉或者下拉的,因为LCD_DATA0~15即为SYSBOOT0-15,在系统上电了之后会采样,从而决定初期的皮配置和启动模式。所以如果你的板子LCD_DATA6上面,是没有上下拉的,板子首先设计就有问题,可能会启动不起来的。