CPU START-UP CONTROL SYSTEM, APPARATUS, CPU START-UP CONTROL METHOD AND PROGRAM

• Main Authors: IZUMI AKIHIKO, WADA MOTOHARU
• Format: Patent
• Language: English; Japanese
• Published: 26.01.2017
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

PROBLEM TO BE SOLVED: To provide a CPU start-up control system capable of reducing start-up time even when the CPU uses plural clock signals of different frequencies.SOLUTION: The CPU start-up control system includes: a power supply control unit that controls the output of power from a power supply unit as an output control object, which supplies the power to at least one oscillator other than a first oscillator which requires the longest time from the power reception start to the stabilization of oscillation in plural oscillators which supply oscillation signals to CPU; and a CPU start-up control unit that controls the CPU to start up when determining that the time required for a second oscillator, which requires the longest time from the start of power reception to the stabilization of oscillation in the oscillators, to which the power supply unit as output control object supplies the power, has elapsed from the start of power output from the power supply unit as the output control object.SELECTED DRAWING: Figure 1 【課題】ＣＰＵが周波数の異なる複数のクロック信号を用いる場合も起動時間を短縮できるようにする。【解決手段】ＣＰＵ起動制御システムが、ＣＰＵに発振信号を供給する複数の振動子のうち電源受給開始から発振安定までに最も時間を要する第１振動子以外の少なくとも１つの振動子に電源を供給する出力制御対象電源部からの電源の出力を制御する電源供給制御部と、前記出力制御対象電源部が電源を供給する振動子のうち電源受給開始から発振安定までに最も時間を要する第２振動子が電源受給開始から発振安定までに要する時間が、前記出力制御対象電源部からの電源出力開始から経過したと判定した場合、前記ＣＰＵの起動を開始させるＣＰＵ起動制御部と、を備える。【選択図】図１