| Patent Number |
Title Of Patent |
Date Issued |
| 7581128 |
Microcomputer selecting operating condition |
August 25, 2009 |
| A microcomputer includes a CPU, a program memory for storing a subroutine program, peripheral circuits, a clock circuit, and a voltage drop detection circuit. When the voltage drop detection circuit detects the voltage drop at the end of a power line, a frequency of a clock signal pr |
| 7571260 |
CPU address decoding with multiple target resources |
August 4, 2009 |
| A microcomputer includes a CPU, multiple resources, and an output circuit having an address decoder. The CPU outputs an address signal to the address decoder. The address decoder decodes the address signal and the output circuit outputs a select signal to at least one of the resources |
| 7560996 |
Frequency-multiplied clock signal output circuit |
July 14, 2009 |
| In a DPLL circuit, when the size of a data value which is output from a data latch circuit and should be naturally set in a 11-bit down-counter becomes equal to or more than 12 bits, an overflow preventing circuit substitutes the 11-bit data for the data value. |
| 7554415 |
Microcomputer including a CR oscillator circuit |
June 30, 2009 |
| A microcomputer includes an oscillator for generating a clock signal having a frequency by using a CR circuit, a multiplier for outputting the clock signal having a multiplied frequency relative to the frequency generated by the oscillator based on data from an external source, a tem |
| 7519753 |
Communication system |
April 14, 2009 |
| A communication system includes a master control unit, a plurality of slave control units, and buses connecting the master control unit and the slave control units for the asynchronous communication. When the master control unit starts the communication, each slave control unit transmits |
| 7467294 |
Microcomputer with mode decoder operable upon receipt of either power-on or external reset signa |
December 16, 2008 |
| A microcomputer includes a plurality of operation mode selecting terminals to which data for selecting plural operation modes are set. The plurality of operation mode selecting terminals is designed so as to be usable as general-purpose input terminals or output terminals. A decoder deco |
| 7466159 |
Semiconductor integrated circuit having multiple semiconductor chips with signal terminals |
December 16, 2008 |
| A semiconductor integrated circuit includes: a package; semiconductor chips in the package including a signal terminal; and a wiring connecting signal terminals. One semiconductor chip is a test object chip including a probe terminal and a test object terminal. The probe terminal connect |
| 7444529 |
Microcomputer having rewritable nonvolatile memory |
October 28, 2008 |
| A CPU, when shifting to a sleep mode, discontinues the oscillating operations of an oscillation circuit and of a frequency multiplier circuit through a low power consumption control circuit. A flash power source circuit discontinues the oscillating operations of the circuits or inter |
| 7421384 |
Semiconductor integrated circuit device and microcomputer development supporting device |
September 2, 2008 |
| During software development, a multichip module is used which encloses a target chip and a development chip in one package. A CPU of the development chip fetches instructions from a flash memory in the chip to execute them, and accesses RAM and peripheral circuits in the chip. For mo |
| 7356721 |
Microcomputer and emulation apparatus |
April 8, 2008 |
| A single-chip microcomputer includes a logic circuit, a CPU and a flip-flop for synchronizing an interrupt-request signal, which is supplied by the logic circuit to the CPU, based on a clock signal. A multi-chip emulation apparatus comprises a peripheral evaluation chip, a CPU evalua |
| 7356719 |
Microcomputer |
April 8, 2008 |
| In an EEPROM of a microcomputer, data is stored for determining a communication rate CMR for fixing the data transmission time of one frame managed by a communication circuit on the basis of an oscillation output characteristic of a CR oscillating circuit that varies in accordance with |
| 7313048 |
Reset detection circuit in semiconductor integrated circuit |
December 25, 2007 |
| A reset detection circuit for a logic circuit and a RAM includes a first determining circuit, a second determining circuit and a reset signal generating circuit. The first determining circuit operates with a first voltage and determines whether a second voltage is equal to or higher |
| 7248092 |
Clamp circuit device |
July 24, 2007 |
| In a clamp circuit device, reference voltages are set up by a series circuit of an FET, a resistor and an FET. Gate potentials of FETs are set up by performing addition and subtraction of these reference voltages and a reference voltage generated by a bandgap reference circuit, respe |
| 7221206 |
Integrated circuit device having clock signal output circuit |
May 22, 2007 |
| Integrated circuit device includes: a wiring; a clock signal output circuit including a ring oscillator; an internal circuit; an internal power supply generation circuit for supplying an electric power to the clock signal output circuit and to the internal circuit on the basis of a p |
| 7216250 |
Clock control circuit for correcting frequency of second clock signal based on first clock signa |
May 8, 2007 |
| The present invention relates to a clock control circuit apparatus including a first oscillation circuit for generating a first clock signal and a second oscillation circuit for generating a second clock signal and capable of, when the two clock signals are put to use, improving the |
| 7162622 |
Microcomputer for apparatus control and vehicle-mounted electronic control unit incorporating mi |
January 9, 2007 |
| A microcomputer which is to be utilized in a condition of being built into an apparatus such as a vehicle ECU, includes a ROM having stored therein a program which is prepared by a user and a boot ROM which stores an initialization program for performing at least essential initialization |
| 7149915 |
Microcomputer using a shared counter |
December 12, 2006 |
| In a microcomputer, a watch-dog timer and a sleep control timer share a counter in their signal generating circuits. In a normal operation mode, an AND gate is in a signal passing state and a reset signal RST can be outputted. In a sleep mode, another AND gate is in a signal passing stat |
| 6934941 |
COMPILER FOR GENERATING RISC OBJECT CODE WHEREBY OPERATIONS ON BIT VARIABLES WRITTEN IN SOURCE C |
August 23, 2005 |
| A computer program compiler generates object code to be executed by a RISC type of CPU, whereby in effect each bit operational expression appearing in the source code, such as an AND operation on two bit variables, is converted to an operation whereby the respective values of the bit |
| 6876180 |
Power supply circuit having a start up circuit |
April 5, 2005 |
| A reference voltage circuit and an operational amplifier operate when an output voltage is produced from an output terminal of a power supply circuit. When the output voltage is low in the rising phase of a power source voltage, a transistor Q17 in a startup circuit turns on and a tr |
| 6794921 |
Clamp circuit |
September 21, 2004 |
| In the clamp circuit, the first transistor shifts a target clamp voltage by a gate-source voltage to output the target clamp voltage. The buffer circuit inputs the shifted voltage and output a reference voltage on the inputted shifted voltage. The gate of the second transistor is connect |
| 6742087 |
Control of access by multiple data processing units to multiple memories |
May 25, 2004 |
| When a data read request is made at a long unit (two words) in a data processing system including a plurality of data processing unit, a control unit, a plurality (for example, two) of memory devices, data is simultaneously read from both memory devices. While certain data is supplie |
| 6737905 |
Clamp circuit |
May 18, 2004 |
| The clamp circuit clamps an input voltage at prescribed higher and lower clamp voltages which are stabilized under a temperature fluctuation. Transistors Q12 and Q14 are switched on in their linear region. In a lower voltage clamp circuit 18, an Vin detecting circuit 20 outputs Va1 by |
| 6697938 |
Microcomputer executing an ordinary branch instruction and a special branch instruction |
February 24, 2004 |
| A microcomputer has a built-in memory and is accessible to an external memory. The microcomputer executes a specific area branch instruction "JM" as an executable instruction. The specific area branch instruction "JM" is a branch instruction restricted to jump to only a specific area of |
| 6677781 |
Semiconductor integrated circuit device |
January 13, 2004 |
| A common power source line has first power supply points and second power supply points. The first power supply points are provided for supplying electric power to buffer circuits of low-frequency signal pads, while the second power supply points are provided for buffer circuits of h |
| 6653884 |
Input interface circuit for semiconductor integrated circuit device |
November 25, 2003 |
| An input interface circuit for a semiconductor integrated circuit device is provided which includes a pair of diodes, first, second, and third PMOSFETs, and first, second, and third NMOSFETs. The diodes serve to clamp a high positive or negative voltage input at a level that is the sum o |
| 6653880 |
Semiconductor integrated circuit device forming power sources having different voltages for oper |
November 25, 2003 |
| A microcomputer prevents an unnecessary signal from being outputted before the microcomputer is released from a reset state when the microcomputer includes a plurality of circuit blocks operating at different power source voltages. A reset signal transmitted to an input/output terminal u |
| 6614282 |
Clamp circuit for a semiconductor integrated circuit device |
September 2, 2003 |
| A comparator, having an offset of 0.1V, compares a terminal voltage Vin1 with a clamp voltage V.sub.CL (5.1V). When an overvoltage input exceeding the V.sub.CL is entered to an input terminal, the comparator turns on a transistor Q11. The current flows across an externally provided resis |
| 6581119 |
Interrupt controller and a microcomputer incorporating this controller |
June 17, 2003 |
| To downsize the circuit scale of a CPU in a microcomputer capable of executing multiple interrupt, an interrupt controller includes an interrupt mask level register. The CPU temporarily transfers or stacks processing data into a RAM. The processing data include a PSR (i.e., system re |
| 6476586 |
Capacitor charge control circuit and microcomputer using the same |
November 5, 2002 |
| A microcomputer has a CPU, a charge and discharge control circuit connected to the CPU, an input/output port, and comparator. A capacitor is connected to the microcomputer through the input/output port. The comparator outputs a high level signal or a low level signal based on a voltage o |
| 6304957 |
Multitask processing unit |
October 16, 2001 |
| The microcomputer shall be offered which has realized more simplified peripheral circuits and more reduced price, besides being provided with the functions of timer, runaway monitor and backup logic. To that effect, the address register and the register are installed which have two areas |
| 6249858 |
Information processing apparatus having a CPU and an auxiliary arithmetic unit for achieving hig |
June 19, 2001 |
| An information processing apparatus such as a microcomputer consisting of a CPU and a coprocessor is provided. The CPU and the coprocessor are connected through a data bus and an address bus. Switches are disposed in the data bus and the address bus which block communication between the |
| 6195779 |
Microprocessor having built-in CRC section and method for performing CRC operations using the sa |
February 27, 2001 |
| To provide a microprocessor that can perform high-speed CRC code generation and can be implemented simply and at a low cost, a microprocessor has, at a part of a data input path to a shift circuit which is conventionally installed in an ALU of the microprocessor to execute shift commands |
| 6131073 |
Electronic circuit with an operating characteristic correcting function |
October 10, 2000 |
| A power voltage of a power source circuit is produced by amplifying a threshold voltage difference of an operational amplifier by an amplification factor corresponding to a dividing ratio of a resistance dividing circuit. The power source circuit is integrated on a CMOS substrate tog |
| 6054751 |
Semiconductor integrated circuit |
April 25, 2000 |
| In an integrated circuit in which function blocks constituting a CPU block, a memory block and the like, a power supply line for supplying power to the function blocks, and multiple signal lines for inputting and outputting signals to and from the function blocks are formed on a semi |
| 5790603 |
Communication apparatus with collision detection and edge detection for transmitting and receivi |
August 4, 1998 |
| A communication apparatus is used in a communication system, having a communication line, where an operation timing in each of the communication apparatus is coupled to the communication line and synchronized with the received signals in each of the communication apparatus. This comm |
| 5737588 |
Driving circuit for a microcomputer that enables sleep control using a small-scale timer |
April 7, 1998 |
| For a system which receives a sleep command to terminate the application of machine clock signals to a microprocessor and which clocks control execution time and stabilization time after the return from sleep control and resumes the supply of the machine clock signal, the clocking device |
| 5736896 |
Signal processing circuit |
April 7, 1998 |
| A signal processing circuit includes a signal selecting device operative for selecting and outputting one of plural input signals. A filter connected to the signal selecting device filters the signal selected by the signal selecting device with a changeable center frequency of a pass |
| 5684838 |
Receiving device for sampling data bits at a preferred time |
November 4, 1997 |
| In a receiving device, when a communication signal, which changes between low level and high level, is received via a filter circuit, an occurrence of an edge of the filtered received signal is monitored. Upon detection of the edge, a type of the edge, that is, whether the edge is a lead |
| 5522254 |
Knock sensing apparatus for internal combustion engine |
June 4, 1996 |
| A knock sensing apparatus for an internal combustion engine which can detect a failure in a knock sensor signal system correctly even when a changeover operation due to hardware is performed at a place between a knock sensor and a band pass filter. In this knock sensing apparatus, the |
