Hello,

Be sure your 24c64 is not set to the same address as the 8573.

Did you wait long enough after writing the data? It will take more than 1ms after a write command before the device is ready to accept new commands, either read or write. You know when the write sequence is done when the device answers with an acknowledge again.

Also be sure not to send an Acknowledge after the last byte read from the device! Otherwise it may output a 0 on SDA, blocking the I2C bus for further commands.

Happy programming.