I have a problem simulating without an I2C Debugger connected. My circuit consists of

1. MCU is pic16F877A
2. Clock speed of 20MHz
3. I2C speed of 100KHz
4. First EEPROM Slave Address - 0xA0
5. Second EEPROM Slave Address - 0xA6

With the I2C Debugger connected (as shown in the attachment), everything works fine. However, when I exclude the I2C debugger from simulation, the Master MCU receives 'NACK' instead of 'ACK'. This result in 'Write' to EEPROM being aborted.

Has anyone comes across this problem before? Or must the debugger be connected for the simulation to work correctly?

Any help is highly appreciated. Thanks.

 

This may or may not be related to the issue you're having, but is your copy of Proteus legitimate (did you actually buy it), or is it a cracked copy?