| 摘要 |
PROBLEM TO BE SOLVED: To suppress the deterioration of the reception sensitivity of an antenna in the LCD non-access even in a portable telephone set having an LCD arranged in the neighborhood of the antenna by allowing a control means to respectively independently control a first address data bus and a second address data bus. SOLUTION: An address data bus for transmitting address-designated information connects an address data bus 11 only for LCD making only an LCD control part 7 independent from the other blocks to a CPU 1, and the other blocks are connected to the CPU 1 through an address data bus 10 to be used in common. Thus, it is possible to singly operate the bus 11 to the part 7 and by lowering driving capability by dropping the voltage of only the bus 11, noise generated from the bus 11 can be reduced. Further, an antenna is never affected even when the CPU 1 executes fast access to a memory, etc.
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