| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a data processor which can reduce the power consumption by reducing an interruption of energy saving mode with an operation confirmation signal. SOLUTION: A receiving circuit 10 consists of shift registers 7 and 8, a data comparator 3, a mask register 4, a mask enable register 5, and a receiving buffer 6, a keyboard 2 is connected to the receiving circuit. The keyboard 2 outputs a 1st alive code signal 21 and a 2nd alive code signal 22 having a longer cycle at a constant interval of time in addition to data signals generated by the key operation. In an energy conservation mode, the 1st alive code signal 21 outputted by the keyboard 2 through the shift register 7 is masked by the data comparator 3 and not outputted to a data bus 9.</p> |
