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CCS/MSP430G2203: how does msp430g2203 iic hardware slave work ?

Part Number:MSP430G2203

Tool/software: Code Composer Studio

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This screenshot is the signal graph captured by two oscilloscopes during 430IIC communication. One of the two msp430 serves as  hosts  and the other serves as slave. the C code provided by ti.

my question is :

Why does the iic host wait for a while after sending the slave address to receive the ack signal of the slave?


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