Oscillators – Plural oscillators
Patent
1990-09-24
1992-02-18
Pascal, Robert J.
Oscillators
Plural oscillators
331 49, 307269, H03B 100
Patent
active
050897934
ABSTRACT:
Disclosed is a semiconductor device in which a CPU and an oscillation circuit are driven with the same driving voltage. The oscillation circuit is constituted by a plurality of oscillation invertors having different characteristics respectively corresponding to different reference voltages for driving the CPU. One of the oscillation invertors is selected corresponding to the driving voltage of the CPU so that the oscillation signal of the selected oscillation circuit is sent out as a system clock. It is therefore possible to obtain preferable characteristics that, when the driving voltage of the CPU is changed over in accordance with a program, fluctuation in the driving ability of the oscillation invertors, which has been conventionally generated, is prevented from occurring, so that oscillation easily starts upon turning-on of a power supply, oscillation hardly stops when a source voltage becomes low, and high harmonics oscillation hardly occurs.
REFERENCES:
patent: 4882738 (1989-11-01), Suzuki
Pascal Robert J.
Seiko Epson Corporation
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