我用MSP430G2553烧入I官方的demo I2C 例程，G2互相通信的，为什么不能通信，需要外接上拉电阻吗？
我配置内部上拉电阻，为啥P1.6只有2V？而且也不能通信。
求助啊 什么地方配置错误了吗？
我用MSP430G2553烧入I官方的demo I2C 例程，G2互相通信的，为什么不能通信，需要外接上拉电阻吗？
我配置内部上拉电阻，为啥P1.6只有2V？而且也不能通信。
求助啊 什么地方配置错误了吗？
MSP430的这个代码分了两部分，会不会是你两个MCU用了同一个代码，看下面的描述；
附件是代码，再一个就是外加上拉4.7K的电阻吧，内部的上拉电阻值太大，大约35K，不太符合I2C标准。
msp430g2xx3_uscib0_i2c_04.c
// MSP430G2xx3 Demo - USCI_B0 I2C Master RX single bytes from MSP430 Slave
//
// Description: This demo connects two MSP430's via the I2C bus. The master
// reads from the slave. This is the master code. The data from the slave
// transmitter begins at 0 and increments with each transfer. The received
// data is in R5 and is checked for validity. If the received data is
// incorrect, the CPU is trapped and the P1.0 LED will stay on. The USCI_B0
// RX interrupt is used to know when new data has been received.
// ACLK = n/a, MCLK = SMCLK = BRCLK = default DCO = ~1.2MHz
msp430g2xx3_uscib0_i2c_05.c
// MSP430G2xx3 Demo - USCI_B0 I2C Slave TX single bytes to MSP430 Master
//
// Description: This demo connects two MSP430's via the I2C bus. The master
// reads from the slave. This is the slave code. The TX data begins at 0
// and is incremented each time it is sent. An incoming start condition
// is used as a trigger to increment the outgoing data. The master checks the
// data it receives for validity. If it is incorrect, it stops communicating
// and the P1.0 LED will stay on. The USCI_B0 TX interrupt is used to know
// when to TX.
// ACLK = n/a, MCLK = SMCLK = default DCO = ~1.2MHz
