UCB0CTLW0 |= UCSWRST; //reset I2C Module
UCB0CTLW0 |= UCMODE_3 + UCSYNC; //I2C Slave
UCB0I2COA0 = SLAVE_ADDRESS;
//Set P1.6 & P1.7 on I2C MODE
P1SEL1 |= BIT6 + BIT7;
P1SEL0 &= ~BIT6; P1SEL0 &= ~BIT7;
UCB0CTLW0 &= ~UCSWRST; //reset I2C Module
UCB0IE__I2C |= UCTXIE0 + UCRXIE0 + UCSTTIE + UCSTPIE; //Enable I2C INTERRUPT
上面是对MSP430FR5738 I2C模式的初始化。初始化完成后，主机发送S+ADDR+W，MSP430不能产生ACK信号。查看430内部寄存器UCB0ADDRX，已经收到了正确的地址，但没有产生ACK信号，请问是什么原因
