Hitachi, Ltd.

Shirou Baba

Matsuo Amano

Takeshi Hirayama

Hideo Maejima

Takao Sasayama

Yasushi Akao

Hideo Nakamura

Ikuro Masuda

Shinichi Sakamoto

Yoshimune Hagiwara

Terumi Sawase

Hiroyuki Kida

Hiroyuki Hatori

Masami Shiida

A digital semiconductor integrated circuit is equipped with: a digital signal input circuit; an analog signal input circuit made receptive of an analog signal for feeding out a digital signal corresponding to the analog signal; and a common external terminal connected commonly with the input terminals of the digital signal input circuit and the analog signal input circuit. By a suitable switch circuit, the common external terminal can be used as either an analog signal input terminal or a digital signal input terminal. As a result, the number of the external output terminals required can be reduced.

Digital semiconductor integrated circuit and digital control system

A data processing system incorporating a main memory for storing instructions and operands and performing data processing in a mode of microprogram control system in response to instructions read out of the main memory. The system translates an instruction word read out of the main memory into an intermediate machine word having the orthogonal format, and addresses a microprogram memory in correspondence to the instruction word by analyzing the intermediate machine word. The system further incorporates a plurality of register sets so that each different task can use an individual register set, and a memory for memorizing the number of registers holding parameters used commonly among procedures corresponding to the register sets, so that the number of registers for each use can be changed arbitrarily for each register set by using the memory.

Data processing system with device for arranging instructions

Herein disclosed is a digital semiconductor integrated circuit which is equipped with: a digital signal input circuit; an analog signal input circuit made receptive of an analog signal for feeding out a digital signal corresponding to said analog signal; and a common external terminal connected commonly with the input terminals of said digital signal input circuit and said analog signal input circuit. By the preparation with the use of a suitable switch circuit, the common external terminal can be used as either an analog signal input terminal or a digital signal input terminal. As a result, the number of the external output terminals required for the semiconductor integrated circuit can be reduced.

Monolithic integrated circuit having common external terminal for analog

A typical single chip microcomputer disclosed in the present application comprises a control circuit, a processing circuit and a plurality of address register--status register pairs. A logical unit formed within the control circuit comprises an electrically writable non-volatile-semiconductor memory device. Information can be externally written into the non-volatile semiconductor memory included in the logical unit, and the above described plurality of address register--status register pairs can be arbitrarily selected. As a result, logic function of the logical unit can be arbitrarily established in accordance with externally supplied information. Demanded specifications of various users can be satisfied by the logic function thus arbitrarily formed.

Single chip microprocessor for satisfying requirement specification of

Herein disclosed is a digital semiconductor integrated circuit which is equipped with: a digital signal input circuit; an analog signal input circuit made receptive of an analog signal for feeing out a digital signal corresponding to said analog signal; and a common external terminal connected commonly with the input terminals of said digital signal input circuit and said analog signal input circuit. By the preparation with the use of a suitable switch circuit, the aforementioned common external terminal can be used as either an analog signal input terminal or a digital signal input terminal. As a result, the number of the external output terminals required for the aforementioned semiconductor integrated circuit can be reduced.

Herein disclosed is a digital semiconductor integrated circuit which is equipped with: a digital signal input circuit; an analog signal input circuit made receptive of an analog signal for feeding out a digital signal corresponding to said analog signal; and a common external terminal connected commonly with the input terminals of said digital signal input circuit and said analog signal input circuit. By the operation with the use of a suitable switch circuit, the aforementioned common external terminal can be used as either an analog signal input terminal or a digital signal input terminal. As a result, the number of the external output terminals required for the aforementioned semiconductor integrated circuit can be reduced.

An engine control apparatus includes a microprocessor, a ROM for holding a program required for the operation of the microprocessor, and a RAM for holding data supplied from the microprocessor. Pulse signals representative of results of the arithmetic operations executed by the arithmetic unit on the basis of input signals available from various sensors as well as data stored in the memory in accordance with the program are supplied to actuators for controlling engine operations through an input/output circuit. The control apparatus further includes a counter for counting crank angle pulses produced in synchronism with rotation of the engine shaft, an interrupt request generating circuit for requiring an interrupt to the microprocessor when overflow occurs in the counter. In response to every interrupt request, the microprocessor causes the count value held in the RAM to be incremented by unity. After elapse of a period for measuring the rotational speed of the engine, the count value held in the counter of the input/output circuit is corrected by the number of overflows held in the RAM.

Electronic control apparatus for an internal combustion engine

In an electronic control apparatus for an internal combustion engine, the contents of a selected reference register are compared with the count contents of a timer so that when equality is found therebetween, an interrupt signal is applied to a central processing unit, which then computes when and how a control condition is to be changed with respect to one of a plurality of controlled systems and the contents of the reference register are updated accordingly. In addition, a plurality of actuators for controlling the operation of the engine are selectively controlled in accordance with control signals generated from the central processing unit on the basis of the receipt of the interrupt signals.

Electronic control apparatus for internal combustion engine

Herein disclosed is a digital semiconductor integrated circuit which is equipped with: a digital signal input circuit; an analog signal input circuit made receptive of an analog signal for feeing out a digital signal corresponding to said analog signal; and a common external terminal connected commonly with the input terminals of said digital signal input circuit and said analog signal input circuit. By the operation with the use of a suitable switch circuit, the aforementioned common external terminal can be used as either an analog signal input terminal or a digital signal input terminal. As a result, the number of the external output terminals required for the aforementioned semiconductor integrated circuit can be reduced.

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Tokorozawa, Japan

Shirou Baba