数据手册中:
12.5.2 DCMI physical interface
The interface is composed of 11/13/15/17 inputs. Only the Slave mode is supported.
The camera interface can capture 8-bit, 10-bit, 12-bit or 14-bit data depending on the
EDM[1:0] bits in the DCMI_CR register. If less than 14 bits are used, the unused input pins
must be connected to ground
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