| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce noise entering inner and outer circuits via power supply lines in either one of an inner power supply mode and an outer power supply mode. <P>SOLUTION: When set to the inner power supply mode, conduction pins 29a and 29b are connected and the conduction pins 29c and 29d are connected by using two short-circuit pieces 31 in a jumper circuit 29. In the jumper circuit 30, the pins are connected in the same manner. In this mode, an inner power source voltage Vp (in) is supplied to an I/O circuit and a sequencer via a noise filter 28. When se to the outer power supply mode, the conduction pins 29b and 29c are connected by using one short-circuit piece 31 in the jumper circuit 29. In the jumper circuit 30, too, the pins are connected in the same manner. In this mode, an external power source voltage Vp (out) is supplied to the I/O circuit 26 via the noise filter 28. <P>COPYRIGHT: (C)2007,JPO&INPIT |
