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I just downloaded the latest MPLAB (V5.50) and MCC (V5.03, Classic), setup a project with the 18LF46K22 and added the MSSP peripheral. This driver has callbacks for all the major states. When a device is not present there will be a NAK in the address phase. The callback you will need is configured with void I2C1_SetAddressNackCallback(i2c1_callback_t cb, void *ptr); So you can create a callback for the NAK as follows: typedef struct { i2c1_address_t address; bool present; } address_present_t; i2c1_operations_t callbackAddrNak(void *funPtr) { address_present_t *Present = funPtr; Present.present = false; return I2C1_STOP; } // this code comes from the i2c1_master_example provided by MCC uint8_t I2C1_Read1ByteRegister(i2c1_address_t address, uint8_t reg) { uint8_t returnValue = 0x00; address_present_t present; present.address = address; while(!I2C1_Open(address)); // sit here until we get the bus.. I2C1_SetAddressNackCallback(callbackAddrNak,&present; // setup the address NACK callback with the address data I2C1_SetDataCompleteCallback(rd1RegCompleteHandler,&returnValue); I2C1_SetBuffer(&reg,1); I2C1_MasterWrite(); while(I2C1_BUSY == I2C1_Close()); // sit here until finished. if(present.present == FALSE) { // do something appropriate. // some memories fail to respond (generate a NAK) when they are busy. // a missing device will also result in a NAK. } return returnValue; } Note: A NAK can be the "normal" operation of some devices such as a memory. Often an EEPROM will refuse to ACK their address when they are busy writing. You use a process called NAK polling. If you do the device scan during a time when you can expect all devices to be active and ready, then you should be able to generate a map of the available addresses. Good Luck

I just want to say thank you. I learned a lot from this post.

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You have mis-interpreted the table, each row is meant to be independent. I thought the same thing, until I realized that the columns were not to be taken as a whole, but just defining low, medium, or high for each independent category column.

Was any solution found? I note the CONFIG bits have not been shown. The chip will not run if the oscillator has not been set up correctly, and it will be rapidly resetting if the WDT has not been disabled.