Data processing unit including central unit and peripheral unit driven by separate power supplies
First Claim
1. A data processing unit comprising:
- a first power supply consisting of a stable power supply;
a central unit operating on said first power supply;
a second power supply;
a peripheral unit operating on said second power supply;
an interface block for transferring an external input signal to said peripheral unit; and
a power-down detector operating on said first power supply and directly connected to said second power supply, for detecting a power down of said second power supply and for generating a signal informing of the power down when it takes place, wherein said central unit enters a reduced power consumption mode upon receiving said power down signal.
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Accused Products
Abstract
A data processing unit includes a first power supply consisting of a stable power supply, a central unit operating on the firsts power supply, a second power supply, a peripheral unit operating on the second power supply, an interface block for transferring an external signal to the peripheral unit, and a power-down detector operating on the first power supply and connected to the second power supply, for detecting a power down of the second power supply and for generating a signal informing of the power down when it occurs. This power down signal can prevent supply of the external input signal to the central unit. The data processing unit solves problems of conventional data processing units including separate central unit and peripheral power supplies in that an unexpected power down of the peripheral use power supply can cause malfunctions of the central unit because of, e.g., an undesired interrupt signal.
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Citations
12 Claims
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1. A data processing unit comprising:
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a first power supply consisting of a stable power supply;
a central unit operating on said first power supply;
a second power supply;
a peripheral unit operating on said second power supply;
an interface block for transferring an external input signal to said peripheral unit; and
a power-down detector operating on said first power supply and directly connected to said second power supply, for detecting a power down of said second power supply and for generating a signal informing of the power down when it takes place, wherein said central unit enters a reduced power consumption mode upon receiving said power down signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A data processing unit comprising:
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a first power supply consisting of a stable power supply;
a central unit operating on said first power supply;
a second power supply;
a peripheral unit operating on said second power supply;
an interface block for transferring an external input signal to said peripheral unit; and
a power-down detector operating on said first power supply and connected to said second power supply, for detecting a power down of said second power supply by comparing a voltage level of said second power supply to a reference voltage and for outputting a signal informing said central unit of the power down when it occurs, wherein said central unit operates in a reduced power mode upon receiving said power down signal. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification