Kabushiki Kaisha Toshiba

Hiroo Nakano

Tsutomu Kobayashi

Aki Fukuda

Masatsugu Mukuge

Shinichi Hasebe

According to one embodiment, a semiconductor integrated circuit device includes a non-volatile memory, a storing module, and a processing module. The non-volatile memory is having a first area and a second area. The storing module is configured to store a second program for downloading a first program from an outside to the first area. The processing module is configured to execute the first and the second programs. The non-volatile memory is having a first area and a second area. The storing module is configured to store a second program for downloading a first program from an outside to the first area. The processing module is configured to execute the first and the second programs. The first area is capable of being written and erased by the first program, and the second area is not capable of being erased by the first program.

Semiconductor integrated circuit and method of controlling memory

A CPU and a memory are connected to each other through an address bus, a data bus, a read signal line and a write signal line. A read control signal and a write control signal transferred to the read signal line and the write signal line, respectively, are supplied to a control signal generating circuit. The control signal generating circuit detects a change in the read control signal and the write control signal transmitted to the read signal line and the write signal line, respectively, and then generates a control signal. The control signal generated by the control signal generating circuit is supplied to a pseudo-data generating circuit. The pseudo-data generating circuit generates pseudo-data comprising any random number data in accordance with the control signal and outputs the pseudo-data onto the data bus.

Data processing apparatus and memory card using the same

When a reset signal /RESET is 'L', a flip-flop circuit holds '1'; on the other hand, a flip-flop circuit holds &#x201c;0&#x201d;. When the reset signal /RESET becomes &#x201c;H&#x201d;, the flip-flop circuits captures data in synchronous with a clock signal. When a power supply voltage returns to the initial value after an instantaneous blackout occurs, the data of the flip-flop circuits have the same value. An output signal of an exclusive-OR gate circuit becomes &#x201c;L&#x201d;, the output is held in a flip-flop circuit. As a result, an instantaneous blackout detection signal becomes &#x201c;H&#x201d;.

Multi-function IC card

A semiconductor circuit having a power supply voltage detection circuit to detect a potential level of an external power supply voltage and to output a detection signal depending on a comparison result with the potential level. A system control circuit detects the detection signal, outputs a status signal and an interrupt signal, and outputs a clock selection signal in response to an operation control signal. A CPU outputs the operation control signal to the system control circuit in response to the status signal and the interrupt signal. A clock generation circuit generates a plurality of clock signals and a clock selection circuit selects one clock signal among the plurality of clock signals in response to the clock selection signal. The clock selection circuit then outputs the one clock signal as a system clock signal.

Semiconductor circuit supplied with a varying power supply voltage, and method for operating the same

A security card including a CPU for executing instruction sequences such as a password verifying routine, a memory configured to store secret data such as the password and so forth, a random signal generation circuit configured to generate a wait signal which is output in order to halt the operation of the CPU . When the wait signal is input, the CPU halts its operation for a short time such as one to several clocks. In accordance with the security card , the operation of the CPU can be deferred for a short time in an arbitrary timing in order to make it difficult to analyze the operation of the CPU

Security card and a computer system provided with an interface for reading a security card

A portable electronic device has contacting and noncontacting interfaces and an inhibiting section. The contacting interface including a plurality of contact terminals for exchanging driving power and data. The noncontacting interface for generating driving power and demodulating received data from a signal received via an antenna. The inhibiting section for inhibiting an operation of the other one of the contacting and noncontacting interfaces while the portable electronic device is driven via one of the contacting and noncontacting interfaces.

Portable electronic device with contacting and noncontacting interfaces

An IC card according to the present invention includes a communication section for receiving externally transmitted data, a storage section for storing a file and definition information of the file, and a delete section for, when the data received through the communication section is a command to delete a predetermined file, deleting the predetermined file and definition information of the predetermined file from the storage section.

Growing community of inventors

Atsugi, Japan

Hiroo Nakano