| 摘要 |
<p>PROBLEM TO BE SOLVED: To put all of external storage elements in the standby mode in a batch without taking a complicated circuit configuration. SOLUTION: A chip select control signal for outputting a chip select signal only to a chip select signal output terminal Cout4 is outputted from a microcomputer 1 to an external address decoder 51. Accordingly, a chip select signal is outputted only to the chip select signal output terminal Cout4 to which the external storage element is not connected. Thus, in transition to the standby mode, a chip select signal is not input to all of the external storage elements 41 to 43, so that all of the external storage elements can be transferred to the standby mode.</p> |
