| 摘要 |
PURPOSE:To carry out an extremely quick programmable control by using a programmable logic array obtained by making an internal AND gate into an RAM as an integrated circuit executing the bit arithmetic and carrying out plural bit arithmetic on one occasion. CONSTITUTION:A selective switch 12 is driven by a programmable logic array PLA control signal generator circuit 10 through a main processor not shown in figure, and an address input signal 18 is passed through the main processor. When an address is inputted, an PLA 1a fetches a data pattern through a data bus 4. Then the main processor drives the selective switch 12 from the circuit 10, and latches contents in a data RAM 2 by a data latch 13, after which the main processor causes the PLA 1a to fetch them. After the bit arithmetic processing is executed in the PLA 1a, the output data is rewritten in the RAM 2, and the bit arithmetic processing is terminated. Then the main processor reads the output data out of the RAM 2, and therefore it can obtain the arithme tic result. |
