Microcomputer in which a CPU is operated on the basis of a clock signal input into one of two clock terminals
First Claim
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1. A microcomputer in which a CPU is operated on the basis of a clock signal inputted to a first clock terminal, comprising:
- said first clock terminal and a second clock terminal to which a clock generating circuit is to be connected;
a first gate circuit provided between said first and second clock terminals so as to allow the clock generating circuit to be oscillated when in a transmissible state to transmit a signal; and
a second gate circuit for providing to the first gate circuit a first signal which is a logical OR of a stop signal for suspending the oscillation of the clock signal and an oscillation state selection signal indicative of whether the clock signal inputted to the first clock terminal is a clock signal generated by the clock generating circuit,wherein said first gate circuit is placed in the transmissible state when the first signal is on a first level, and in a state in which it is not able to transmit a signal when the first signal is on a second level.
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Abstract
A microcomputer constituted so that an oscillation state selection signal indicative of whether a clock inputted to a first clock terminal is a clock generated at a clock generating circuit is given to a first gate circuit interposed between a first clock terminal and a second clock terminal, and a first gate circuit is placed in the transmissible state when an oscillation state selection signal is on a first state while a first gate circuit is placed in a state not to be able to transmit a signal when the oscillation state selection signal is on a second state.
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24 Claims
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1. A microcomputer in which a CPU is operated on the basis of a clock signal inputted to a first clock terminal, comprising:
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said first clock terminal and a second clock terminal to which a clock generating circuit is to be connected; a first gate circuit provided between said first and second clock terminals so as to allow the clock generating circuit to be oscillated when in a transmissible state to transmit a signal; and a second gate circuit for providing to the first gate circuit a first signal which is a logical OR of a stop signal for suspending the oscillation of the clock signal and an oscillation state selection signal indicative of whether the clock signal inputted to the first clock terminal is a clock signal generated by the clock generating circuit, wherein said first gate circuit is placed in the transmissible state when the first signal is on a first level, and in a state in which it is not able to transmit a signal when the first signal is on a second level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification