smartsheep 你好，
你要用EMI_BCRx寄存器配置数据的长度 ：
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
你可以用CAPS看一看怎么配置STR9的外部总线。 在ST网站可以找得到CAPS软件，还有一个application note :
AN2361 Interfacing with the STR91x software library using Configuration and Programming Software (CAPS)
还有：
你用8位复用或者你用16位复用外部总线的地址信号不一样：
8位的话，你在0x0042写一个字节,EMI总线上的地址是0x0042
16位的话，你在0x0042写一个"half word", EMI总线上的地址是0x0021
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
Best Regards,
Stephane
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