| 摘要 |
PURPOSE:To read a data array in a memory and to write data in a movement destination without any control of a microprocessor by allowing a direct memory access control circuit to intervenue between an external register and a gate independently. CONSTITUTION:The microprocessor 1 sets the starting address of a transfer destination in the memory and the number of transfer bytes in the address counter 7 and byte counter 6 in a direct memory access control circuit 4. Fur ther, the starting address of the transfer destination in the memory 3 and the number of transfer bytes are set in the address counter 10 and byte counter 9 of a direct memory access control circuit 5 respectively. When the microprocessor sends a direct memory access permitting signal to a timing generating circuit 8, the address of the address counter 7 is sent out to the memory through an address bus 116 and this is repeated by as many times as the number of bytes. |
