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https://e2e.ti.com/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/580051/msp430g2553
谁能解释一下msp430g2553的针图，
还有人能帮我模拟使用msp430g2553的步进电机速度控制吗
