| 摘要 |
<p>PURPOSE:To reduce the number of interface signal lines for connecting a data processor main body to an IC card by realizing data transfer in the form of analog signal transfer. CONSTITUTION:The data outputted from a CPU 11 on a data processor main body 10 side or the memory 21 of an IC card 20 are transferred to the processor main body 10 or card 20 side. When the data transfer is made, the transferring direction of analog signals is switched by an enable signal E from the CPU 11. By using such analog signal transferring system, the number of interface signal lines between the main body 10 and card 20 can be reduced to one signal line 31. Therefore, the need of a plurality of signal lines corresponding to the bit number of transferring data is eliminated and data transfer can be realized with the one analog signal line 31 and two control lines 32a and 32b only.</p> |
