| 摘要 |
PROBLEM TO BE SOLVED: To reduce power consumption, and to prevent through-currents. SOLUTION: When a bus access is performed, an input/output control circuit 1 resets the count value of a timer pull-up control circuit 5. When any bus access is not performed, and reset is released, the timer pull-up control circuit 5 operates count-up. Then, when the bus access is performed before the count value reaches a Limit value, the timer pull-up control circuit 5 resets the count value. When any bus access is not performed, the timer pull-up control circuit 5 continues the count-up, and when the count value reaches the Limit value, it turns a pull-up resistance 6 into an ON state, and maintains the ON state of the pull-up resistance 6 until the bus access is performed.
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