| 摘要 |
<p>PURPOSE:To specify the function of a terminal to take charge of an interface with an external part by setting a condition setting register during the input period of a resetting signal to initialize the internal condition of a micro processor. CONSTITUTION:In a microprocessor operated by nonoverlap two phase clocks phi1 and phi2, when from the rise of phi2 to the next rise of phi2, a RESET signal is inputted, the output of an exclusive OR circuit 5 comes to be a high level from the rise of phi2 to the rise of the next phi1. When the data are inputted to terminals 1-4 during the high level period, signals M1-M4 are outputted, and therefore, the value of the signals M1-M4 is decoded and used for setting the condition. Only when the signals M1-M4 come to be all a high level, a signal line 6 comes to be active, an internal signal S5 is outputted from an output terminal 7, when the signals M1-M4 are except the above-mentioned, an internal signal S6 is outputted and two types of the function can be held for the output terminal.</p> |
