System wake up circuit for computer

• US 4,849,919 A
• Filed: 06/11/1986
• Issued: 07/18/1989
• Est. Priority Date: 06/14/1985
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Haneda, Isamu
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): Ramirez, Ellis B.
• Application Number:
  US06/872,878
• Time in Patent Office: 1,133 Days
• Field of Search: 364/200, 364/900, 364/569, 364/187, 371/11, 371/12, 371/14, 371/4, 371/16, 371/20, 371/24
• US Class Current: 702/177
• CPC Class Codes: G06F 1/24 Resetting means

Abstract

An electronic apparatus such as a computer is of the type in which the computer is energized for wake up in accordance with a timer or an external key input. Prior to the system wake up by the timer or external key input, an alarm is generated for a predetermined time, indicating that the system wake up is being caused and the peripheral interface or machine should not be electrically coupled to the computer.

Claims

1. An electronic apparatus with peripheral interface means for selectively coupling additional hardware to the electronic apparatus, comprising:

central processing means for controlling said electronic apparatus during a system on condition when power is transmitted to said central processing means;

sub-central processing means for comparing a current time to an alarm time during a system off condition when power is prevented from being transmitted to said central processing means, said sub-central processing means initiating a wake up actuation when said current time and said alarm time are determined to be equal; and

alarm means for providing an alarm for a predetermined period of time in response to initiator of said wake up actuation, said alarm indicating that selective coupling of additional hardware to said peripheral interface means should be withheld for said predetermined period of time.

2. The electronic apparatus of claim 1, further comprising keyboard means having an external key for initiating said wake up actuation.

3. The electronic apparatus of claim 1, wherein:

said sub-central processing means enables power transmission to said central processing means in response to said wake up actuation being initiated.

4. A method for signaling that the selective coupling of additional hardware to peripheral interface means of an electronic apparatus should be withheld, comprising the steps of:

controlling said electronic apparatus by a central processing means during a system on condition when power is transmitted to said central processing means;

comparing a current time to an alarm time by sub-central processing means when power is prevented from being transmitted to said central processing means and determining if said current time and said alarm time are equal;

initiating a wake actuation by said sub-central processing means in response to said current time and said alarm time are determined to be equal by said step of comparing; and

providing an alarm for a predetermined period of time in response to said wake up actuation being initiated, said alarm indicating that the selective coupling of additional hardware to said peripheral interface means should be withheld for said predetermined period of time.

5. A method as defined in claim 4, further including the step of:

transmitting power to said central processing means in response to said wake up actuation being initiated by said sub-central processing means.

6. A method as defined in claim 4, wherein the step of initiating said wake up actuation is provided when an external key from keyboard means is activated.