| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an output variable circuit whose output can be freely adjustable to pull-up, pull-down, or high impedance according to the specification of a product. <P>SOLUTION: This output variable circuit has a device which enables setting to a predetermined output by a download of a predetermined program, and a resistor whose one end is connected to the output of the device and the other end is connected to a wiring conductor. The device is so configured that its output becomes high (H), low (L), or high impedance depending on a program downloaded to the device. The device makes the resistor operate as a pull-up resistor when the output is set to high (H), makes the resistor operate as a pull-down resistor when set to low (L), and makes the resistor ineffective when the output is set to high impedance and does not make the resistor operate as a pull-up resistor and a pull-down resistor. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
