| 摘要 |
PROBLEM TO BE SOLVED: To exactly transfer data in spite of the type of a processor by designating either count-up control or count-down control concerning the read of high- order and low-order bits for the unit of a word and setting a protocol so that the arrangement of data can be equal. SOLUTION: When transferring data, as the reading command of data from a Motorola type CPU to an Intel type CPU, the read address of data and whether the read of an address is up (count-up control) or down (count-down control) are instructed. In this case, it is instructed to the Intel type CPU to 'transmit a data read address XX04H address for 4 bytes through the down system'. Therefore, serial data are transferred in the order of 'D, C, B, A'. The Motorola type CPU, which receives the data, writes the data for the unit of a word. |
