Semiconductor device, portable remote terminal unit and intermittent receiving method

A portable remote terminal unit in which power to blocks unnecessary for an intermittent receiving control process is disconnected for a period when the unit in a standby state does not perform intermittent receiving, the portable remote terminal unit comprising:

• an error check necessity judgment circuit for judging whether an error check must be made on data for booting loaded from a memory where power is not disconnected by a boot process performed at the time of power being applied to perform the intermittent receiving;
• an error check execution circuit for making an error check on the data for booting in the case of the error check necessity judgment circuit judging that an error check must be made;
• an error check necessity notification circuit for notifying the error check necessity judgment circuit whether an error check must be made;
• and
• an error check interval setting circuit for causing the error check necessity notification circuit to notify the error check necessity judgment circuit that an error check must be made at the time of the number of times a boot is performed reaching a certain number.

An intermittent receiving method in which power to blocks in a portable remote terminal unit unnecessary for an intermittent receiving control process is disconnected for a period when the unit in a standby state does not perform intermittent receiving, the intermittent receiving method comprising the steps of:

• applying power to blocks in the portable remote terminal unit necessary for an intermittent receiving control process at the time of intermittent receiving;
• loading only a program necessary for the intermittent receiving control process from an external memory;
• judging whether the number of times a boot is performed has reached a certain number;
• and
• making an error check on the program loaded at the time of the number of times the boot is performed reaching a certain number.