| 摘要 |
<p>PURPOSE:To minimize a rise in cost and an increase in the number of components by canceling an apparent operation signal by an output inhibiting circuit and supplying it to a selecting circuit even if the apparent operation signal is supplied to the input terminal of a digital filter connected to a 2nd stand-by switch input terminal when a microcomputer in a wake-up state enters a sleep state. CONSTITUTION:An enable decision circuit 20 is provided. The enable decision circuit 20 consists of four NAND gates 20a, 20b, 20c, and 20d; and the input terminals of the NAND gate 20c is connected to the output terminal of the digital filter 5 connected to three 1st auxiliary switch input terminals 2a and 2b, and the input terminal of the NAND gate 20d is connected to the output terminal of the digital filter 5 connected to 2nd auxiliary switch input terminals 3a and 3b. The NAND gates 20a and 20b among those four NAND gates are supplied with the control signal from a register 10.</p> |
