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3.UART Mode(Such as SKR V1.4)
4.SPI Mode
IV.Notes
1.STEP/DIR mode can only connect EXP2, but it needs to plug the short-circuit
cap on M2EN and M3EN, so that the three drivers can share one signal line; the
other two special modes must be connected with EXP1+EXP2, and M2EN and
M3EN are not needed;
2. The right voltage must be selected at the logic voltage. There are 5V and 3.3V
options. The 32-bit motherboard is generally 3.3V, and the 8-bit motherboard is
5V;
