| 摘要 |
<p>PURPOSE:To initialize a memory circuit without imposing on a processor part, by allowing an address counter to count up automatically by a basic clock once detecting a reset instruction. CONSTITUTION:Once an initial reset instruction is inputted, a flip-flop 22 is set through a signal line 2 to an initial state and the address counter 27 counts up. In a memory circuit 28, information is written in an address corresponding to the output of the counter. At this time, an AND gate 35 outputs logic ''0'' and information on the logic ''0'' is written in the memory circuit 28. When the address counter 27 goes up to a prescribed number, the address counter 7 is reset and at the same time, a flip-flop 2 is also reset to hold a signal line 23 at a logical level ''0'' and a signal line 34 at a logical level ''1'', thereby allowing DMA transfer.</p> |
