Abstract: Information processing system including a first and a second operation mode with operating current lower than the first, a register holding an address of an instruction executed by a processing unit first when a boot address register returns from second to first operation mode, wherein the address is output to the processing unit when second to first operation mode shifting, wherein the boot address register is rewritable, an information holding circuit holding a value of a peripheral circuit module register, wherein the information holding circuit holds, in the second operation mode, information about the peripheral circuit module register, and, transfers information held in the information holding circuit to the peripheral circuit module register regarding a second-to-first operation mode shift, and wherein when an interrupt request is posted from outside the system in the second operation mode, the information processing system performs interrupt processing corresponding to the interrupt request.

Abstract: There is disclosed a sensor node capable of transmitting and receiving a large amount of data or data desired to be reliable without missing data, while preventing battery exhaustion and unnecessary compression of the transmission bandwidth. A name-tag type sensor node includes a detector for detecting connection of an external power supply. When the detector detects that the external power is supplied, the name-tag type sensor node transmits and receives a large amount of data, such as bulk transmission data, at an increased frequency by means of a data selector, a communication timing controller, and a wireless communication controller. Alternatively, the name-tag type sensor node transmits and receives the data desired to be reliable, such as rewriting data of firmware.

Abstract: There is disclosed a sensor node capable of transmitting and receiving a large amount of data or data desired to be reliable without missing data, while preventing battery exhaustion and unnecessary compression of the transmission bandwidth. A name-tag type sensor node includes a detector for detecting connection of an external power supply. When the detector detects that the external power is supplied, the name-tag type sensor node transmits and receives a large amount of data, such as bulk transmission data, at an increased frequency by means of a data selector, a communication timing controller, and a wireless communication controller. Alternatively, the name-tag type sensor node transmits and receives the data desired to be reliable, such as rewriting data of firmware.

Abstract: An information processing device, including: a processing unit; a peripheral circuit module; and a boot address register, wherein the information processing device comprises a first operation mode and a second operation mode having an operating current which is lower than that of said first operation mode, wherein the boot address register holds an address of an instruction to be executed by said processing unit first when the boot address register returns from said second operation mode to said first operation mode, wherein the address is output from said boot address to the processing unit when said information processing device shifts from said second operation mode to said first operation mode.

Abstract: There is disclosed a sensor node capable of transmitting and receiving a large amount of data or data desired to be reliable without missing data, while preventing battery exhaustion and unnecessary compression of the transmission bandwidth. A name-tag type sensor node includes a detector for detecting connection of an external power supply. When the detector detects that the external power is supplied, the name-tag type sensor node transmits and receives a large amount of data, such as bulk transmission data, at an increased frequency by means of a data selector, a communication timing controller, and a wireless communication controller. Alternatively, the name-tag type sensor node transmits and receives the data desired to be reliable, such as rewriting data of firmware.

Abstract: Abstract An information processing device, including: a processing unit; a peripheral circuit module; and a boot address register, wherein the information processing device comprises a first operation mode and a second operation mode having an operating current which is lower than that of said first operation mode, wherein the boot address register holds an address of an instruction to be executed by said processing unit first when the boot address register returns from said second operation mode to said first operation mode, wherein the address is output from said boot address to the processing unit when said information processing device shifts from said second operation mode to said first operation mode.

Abstract: A wireless terminal comprising a radio transceiver for communicating with a base station, an infrared transceiver for communicating with another wireless terminal, a congestion control unit for detecting whether radio communication with the base station is in a collision-free state, and a communication control unit for performing radio communication with the base station by the radio transceiver after detecting unoccupied state in the radio channel by the congestion control unit and transmitting identification information to another wireless terminal by the infrared transceiver when the radio communication with the base station is completed.

Abstract: A mechanism of making a low standby current caused by power off compatible with a fast return operation from a standby caused by an interrupt is realized. An information processing device has a first area that includes a central processing unit and peripheral circuit modules, a second area having information holding circuits for holding values of registers contained in the peripheral circuit modules, and a first power switch for controlling supply of a current to the first area. When the information processing device operates in a first mode, an operating current is supplied to the first area and the second area. When the information processing device operates in a second mode, the first power switch is controlled so that the supply of the current to the first area can be shut off, and the supply of the current to the second area is continued.

Abstract: In order to realize the joining with the legitimate devices for joining with a limited number of operations for terminal devices for which small dimension and low power consumption are required, in the radio communication system according to the present invention, a ReJoin Command for instructing the sensor node to join with other PANs is provided, and by the use of this command, it is possible to change the joining of the sensor node joined with an unintended PAN to another intended PAN. In addition, for joining with the PAN to which it is joined is disjoined, repeated attempts are to be made to join with the PAN.

Abstract: A mechanism of making a low standby current caused by power off compatible with a fast return operation from a standby caused by an interrupt is realized. An information processing device has a first area that includes a central processing unit and peripheral circuit modules, a second area having information holding circuits for holding values of registers contained in the peripheral circuit modules, and a first power switch for controlling supply of a current to the first area. When the information processing device operates in a first mode, an operating current is supplied to the first area and the second area. When the information processing device operates in a second mode, the first power switch is controlled so that the supply of the current to the first area can be shut off, and the supply of the current to the second area is continued.