| 摘要 |
<p>A touch panel input apparatus has a touch panel which consists of X- and Y-direction electrode panels. When the apparatus is in an power-off state, one end of the X electrode panel is intermittently connected to a power source and one end of the Y electrode panel is intermittently grounded via an output resistor, in response to control signals (YHC, SMPC) outputted from a sampling circuit (30, 31, 32, 33, 34, 35, 36, 37). In this state, synchronously with a clock signal (CLK), the sampling circuit (30, 31, 32, 33, 34, 35, 36, 37) performs sampling of a voltage (TABIN) developed across the output resistor when the two electrode panels is brought into contact. The sampling means outputs a power-on instruction signal (ON) to make the CPU perform the power-on operation. The sampling circuit stops its sampling operation once power is turned on. <IMAGE></p> |
