Abstract: To increase the number of times data can be written into a flash memory a flash memory is provided with a real data block having multiple data blocks each having multiple data write cells. A memory control device identifies a data block having a reprogrammable write cell out of the data block, successively adding received, new data segments into the reprogrammable write cell of the identified data block to complete addition of the data segments. The block in a state before the addition is kept to a certain period of time and then erased in the unit of block. When the number of write operations in the data block reaches a predetermined number of times, then it selects new data blocks that are necessary for retaining a subsequent predetermined number of operations to rewrite data, and repeats the aforementioned operations for the selected data blocks.

Abstract: To dramatically increase the number of times data can be written into a flash memory. A flash memory 6 is provided with a real data block 223 having multiple data blocks each having multiple data write cells. A memory control device identifies a data block having a reprogrammable write cell out of the data block, successively adding received new data segments into the reprogrammable write cell of the identified data block to complete addition of the data segments. The block in a state before the addition is kept to a certain period of time and then erased in the unit of block. When the number of write operations in the data block reaches a predetermined number of times, then it selects new data blocks that are necessary for retaining a subsequent predetermined number of operations to rewrite data, and repeats the aforementioned operations for the selected data blocks.

Abstract: There are provided a multisystem network, and a device and method for access to a data storage unit in order to allow processors in a plurality of devices to access the data storage unit. The data storage unit has a data storage area divided in a first area for a first device and a second area for a second device. The first and second devices are connected to the data storage unit via a connection circuit. A first processor in the first device can access directly the data storage unit. The connection circuit has provided therein an emulation register corresponding to a register which stores a command or control data used for the first processor in the first device to access the data storage unit. A second processor in the second device accesses the data storage unit via the emulation register and with intervention of the first processor.

Abstract: There are provided a multisystem network, and a device and method for access to a data storage unit in order to allow processors in a plurality of devices to access the data storage unit. The data storage unit has a data storage area divided in a first area for a first device and a second area for a second device. The first and second devices are connected to the data storage unit via a connection circuit. A first processor in the first device can access directly the data storage unit. The connection circuit has provided therein an emulation register corresponding to a register which stores a command or control data used for the first processor in the first device to access the data storage unit. A second processor in the second device accesses the data storage unit via the emulation register and with intervention of the first processor.

Abstract: A portable electronic device has a connector 42 for being connected to a master having a program executing function, microcomputer 41, which has a program memory 41a for storing a program, for controlling execution of the program, and a storage (not shown) for storing event occurrence, wherein an event that has been stored in the storage is transferred to the master in response to a request from the master.