| 摘要 |
<p>In a refresh pulse producing circuit (11) of a microcomputer, an access detecting section (31, 32, 19, 28) detects access to a non-refresh memory area (14) of an external memory (12) to produce a non-refresh memory signal indicative of the access. A pulse producing section (16, 26) produces a refresh pulse when supplied with the non-refresh memory signal. The refresh pulse producing circuit may comprise a timer for measureng a predetermined time interval from appearance of each refresh pulse to make the pulse producing section produce an additional pulse as one of such refresh pulses after lapse of the predetermined time interval even when the non-refresh mamory signal is not produced. <IMAGE></p> |
