| 摘要 |
In a PC card communication terminal that operates supplied with power from a host device, problems such as malfunctions due to a supply voltage drop at the time of high transmission output are prevented from occurring. A baseband processor ( 1106 ) selects a transmission-power upper-limit measurement mode when a PC card terminal ( 1103 ) is to be controlled for the first time. A supply voltage drop is measured by a voltage measurement circuit ( 1114 ) while a load value of a load circuit ( 1112 ) is being changed. The load value of the load circuit ( 1112 ) when the supply voltage decreases to a permissible lowest supply voltage is obtained. Using a conversion table stored in a memory ( 1107 ), the load value is converted into a transmission output and is set as a transmission-output upper limit. In a normal communication mode, a maximum transmission output is restricted based on this transmission-output upper limit.
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