| 摘要 |
<p>PURPOSE:To handle the data longer than the data length capable of reading a central processing unit at one time, without adding a special program and a circuit by specifying the input port which the central processing unit reads first and sampling the input data in the front end of the signal to read the input port. CONSTITUTION:A central processing device outputs a signal 9 to read the most significant port, and reads the most significant data 2-1 through the most significant port 3. Since the signal 9 to read the most significant port comes to be a data sampling signal 13 through an inverter 7, in the front end of the signal 9 to read the most significant port, input data 2 are sampled to ports 3-6 and the value, in which the data 2-1 are latched, can be read by the central processing unit. Thereafter, by a signal 10 to read an intermediate and higher order port, a signal 11 to read the intermediate and lower order port, and a signal 12 to read the least significant port, intermediate and high-order data 2-2 latched at an intermediate and high-order port 4, an intermediate and low- order data 2-3 latched at an intermediate and low-order port 5 and the least significant data 2-4 latched at the least significant port 6 are read.</p> |
