Renesas Technology Corp.

Mitsubishi Denki Kabushiki Kaisha

Tdk Corporation

Oval Corporation

Toshihiro Abe

Mitsuru Sugita

Yoshio Kasai

Naoki Ootani

Fumio Uchikoba

Hirokazu Kitami

Toshiyuki Anbo

Shintaro Mori

Seiichi Yamazaki

Akihiro Sasaki

Yasuo Moriguchi

Fumihiko Terayama

Masahiro Kitamura

A microcomputer with a built-in flash memory is obtained in which the flash memory can be properly rewritten with a rewrite program kept placed on the flash memory and without requiring additional complicated control circuitry. On accepting an erase/write command which constitutes a rewrite command, a flash memory module () outputs to a flash memory control circuit () a ready status signal RYIBY indicative of a busy state during execution of the series of processing. When the ready status signal RYIBY indicates the busy state, the flash memory control circuit () outputs a hold signal HOLD at active 'H,' in order to inhibit a CPU () from accessing the flash memory module (). When the ready status signal RYIBY has recovered the ready state, the flash memory control circuit () outputs the hold signal HOLD at 'L' to allow the CPU () to access the flash memory module ().

Microcomputer including a flash memory and a flash memory rewrite program stored therein

Redundant circuits to are provided in correspondence to memory blocks to , respectively. Bit lines BL to BL are located across the memory blocks. Spare bit lines SBL and SBL are located across the redundant circuits to . When a memory cell failure occurs in the memory block except a predetermined memory block (for example, a boot block) and when the bit line BL corresponding to the memory cell failure is replaced with the spare bit line SBL , each of switches and is put into an on state in correspondence to the spare bit line SBL . Furthermore, each of switches and is put into the on state in correspondence to the bit line BL . As a result, the spare bit line SBL turns the redundant circuit corresponding to the memory block , to be connected to the memory block

Flash memory having enhanced yield and having enhanced reliability in redundant and dummy circuits

In a microcomputer equipped with a built-in temperature sensor, diodes as a temperature sensor are incorporated in a pair of circuit blocks, respectively, and placed in opposite polarity connection to each other. When detecting a temperature of the microcomputer, a constant current If is supplied to the diodes through terminals commonly connected to both the diodes. A voltage Vf generated at each diode is read through terminals located at more adjacent nodes to the diode when compared in position with the terminals.

Microcomputer equipped with built-in temperature sensor

In the method for the preparation of a laminated ferrite inductor device comprising the steps of: laminating a ferrite green sheet lined with and supported by a substrate film of, for example, polyethylene terephthalate provided with a penetrating through-hole and a coil pattern to a second ferrite green sheet followed by removal of the substrate film by peeling to form a laminate of ferrite green sheets to be subjected to sintering, peelability of the substrate film from the ferrite green sheet can be improved to prevent the ferrite green sheet from occurrence of defects such as breaking, crease formation and stretching by providing a snap groove of an adequate incision depth having a rectangular profile of a frame and, along the outer periphery of the snap groove, a peel-facilitating reinforcement pattern by printing with a printing paste to have a specified line width and printing thickness.

Method for the preparation of laminated inductor device

A mass flowmeter converter detects a Coriolis force acting on a flow tube driven at a constant frequency as a time difference .DELTA.T between two displacement signals detected at symmetrically opposed positions. A mass flow proportional to the time difference .DELTA.T is determined. Sine-wave signals differing in phase and at a constant amplitude are detected paired detecting coils and provide input signals which are pulses having specified pulse width values equal to a leading time (T+.DELTA.T) and a lagging time (T+.DELTA.T). N number of pulses (T+.DELTA.T) and N number of pulses (T-.DELTA.T) are sampled simultaneously by respective integrators having the same time constant, and by using a reference power source a time difference of zero-crossing voltages and a time difference signal enlarged by 2N times is detected. Furthermore, a small time measurement error due to drifts of the charging-discharging circuit is compensated by alternating respective integrators.

Mass flowmeter converter

Growing community of inventors

Tokyo, Japan

Toshihiro Abe