Matsushita Electric Industrial Co., Ltd.

Hiroaki Asada

Atsuo Inoue

Tatsumi Sumi

Taketoshi Matsuura

Shuji Kondo

Joji Nakane

Yoji Okabe

A semiconductor integrated circuit device is provided in which current consumption is reduced at the time a data access by consecutive addresses is performed to a ROM circuit or a RAM circuit. The semiconductor integrated circuit device incorporates a ROM circuitand a control circuitfor controlling a data access to the ROM circuit, wherein an address generation circuitincluded in the control circuit divides a clock to be input, performs a phase adjustment by sampling the divided clock and generates an address signal of several bits in which only a value of 1 bit changes in a sequential order when a data access by consecutive addresses is performed on the ROM circuit.

Memory device having address generating circuit using phase adjustment by sampling divided clock to generate address signal of several bits having one bit changed in sequential order

A microprocessor is provided whose power consumption is reduced optimally according to an execution instruction code and an operational mode. In addition to a first PLA used in a normal operation, a second PLA dedicated for execution of certain instructions frequently used in a slow mode is provided. When instruction codes and state signals to be executed in the slow mode match data set in the second PLA, the operation of the first PLA is stopped, and the microprocessor is controlled according to a microcode output from the second PLA.

Microprocessor

A semiconductor integrated circuit which obtains a driving power from a carrier onto which data has been piggybacked, the semiconductor integrated circuit being characterized by demodulating data by correctly discriminating it even when the obtained power supply voltage has become overvoltage, and characterized by effectively using the power supplied by the carrier. The semiconductor integrated circuit includes: a two-voltage rectifier circuit as a power source circuit ; a voltage regulator circuit which exercises a control so that a power with a higher voltage (VDDH) used for demodulating data does not exceed a certain voltage value; a resistor ; and a capacitor . With this construction, the voltage input to a regulator circuit as the reference voltage changes in correspondence to the change in voltage VDDH which is caused by the change in amplitude.

Semiconductor integrated circuit, a contactless information medium having the semiconductor integrated circuit, and a method of driving the semiconductor integrated circuit

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Takatsuki, Japan

Hiroaki Asada