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MSP430G2553: I2C clock issue

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Part Number:MSP430G2553

During i2c, when a clock of 100khz is generated, its voltage level is low around 2 volts ( when checked at port),whereas a clock of 1 mhz gives voltage level of 3.5 volts ...why the difference? The volatge level of the 100khz is stalling i2c data transfer as SCL =1. Any suggestions??


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