| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To make an external terminal for specifying an operation mode sufficiently function as a power supply terminal or a ground terminal and to easily switch the logic of the external terminal from the external. <P>SOLUTION: A microcomputer includes: internal circuits (102-107), a ground line (29), a power supply line (28), external terminals (20, 21) for specifying the operation modes of the internal circuits (102-107), and a power supply switch circuit (101). The power supply switch circuit (101) includes a first power supply driver (40) for connecting the external terminals (20, 21) to the power supply line (28) or the ground line (29) and a second power supply driver (41) having a driving capacity smaller than that of the first power supply driver (40) to connect the external terminals (20, 21) to the power supply line (28) or the ground line (29). During the reset period of the internal circuits (102-107), the circuit operation of the first power supply driver (40) is inhibited, and after releasing the reset of the internal circuits (102-107), the circuit operation of the first power supply driver (40) is permitted. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
