我看到手册上写外部总线可以是8位复用，也可以16位复用。 16-bit multiplexed data mode and 8-bit multiplexed data mode:
请问这两种模式怎么设置？是不是只要P9配置成IO口，P8配置成EMI就是8-bit multiplexed data mode， 如果P8，P9都配置成EMI就是16-bit multiplexed data mode？ 但是P8，P9必须同时配置成IO口或EMI口的啊。 特别关注8-bit multiplexed data mode，因为这种模式在液晶控制器上用到很多。
EMI_BCRx：Bits 5:4 MW[1:0]: Memory width These bits are written by software to define the memory width of the bank. The bits must be set to match the EMI data bus width configuration. 00: 8-bit 01: 16-bit 10: Reserved 11: Reserved
When configured as a 16-bit data bus, the address output on the EMI bus is shifted by 1 so as to address 16-bit memory devices. For example, writing a half word to location 0x0042 will generate an EMI address of 0x0021
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