| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve a problem that in the conventional technology, a recognition number is transmitted and received repeatedly in 1-bit units to and from an inquirer and accordingly, complicated commands, many operation stages, complicated flip-flops, changeover control of transmission and reception, control of a memory address counter, complicated logical circuits such as a comparison circuit for data and the like are needed, and it is impossible to curb the chip size. <P>SOLUTION: When there are the inquirer for reading a recognition number present in the responder over radio communication and the responder therefor, and when a clock pulse modulated with a high-frequency carrier wave is sent out to the responder from an antenna of the inquirer, there are a first case where the interval of the clock pulses is short and a second case where the interval of the clock pulses is long. The reading of the recognition number from the inquirer is controlled by combining the clock pulse in the first case and the clock pulse in the second case, thus, a reduction in the size of the semiconductor chip of the responder is achieved and an increase in the cost of the semiconductor chip is curbed. <P>COPYRIGHT: (C)2009,JPO&INPIT |
