51 is reduced Feature General Purpose No LCD/CSI/PXP, 52 is Full Feature General Purpose With LCD/CSI/PXP,
so the main difference is this part
more detailed information about feature, pls refer to the data sheet as below:
51 is reduced Feature General Purpose No LCD/CSI/PXP, 52 is Full Feature General Purpose With LCD/CSI/PXP,
so the main difference is this part
more detailed information about feature, pls refer to the data sheet as below: