case TWI_STX_ADR_ACK:            // Own SLA+R has been received; ACK has been returned
			if (read_count >= 1)
				TWI_bufPtr   = TWI_read_scratch[0];
			/* fall-through */
		case TWI_STX_DATA_ACK:           // Data byte in TWDR has been transmitted; ACK has been received
			TWDR = TWI_write_buf[TWI_bufPtr];
			TWCR = (1<<TWEN)|                                 // TWI Interface enabled
				(1<<TWIE)|(1<<TWINT)|                      // Enable TWI Interrupt and clear the flag to send byte
				(1<<TWEA)|(0<<TWSTA)|(0<<TWSTO)|           // 
				(0<<TWWC);                                 //
			TWI_busy = 1;
			TWI_bufPtr = (TWI_bufPtr+1) % TWI_BUFFER_SIZE;
			break;