JPH0823792B2 - Power control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a power supply control device used in an information processing device, and in particular, control of turning on / off the power supply in response to a plurality of on / off signals from a host control device. The present invention relates to a power supply control device using a microprocessor that sends out a signal.

[Conventional technology]

Conventionally, a power supply control device of this type has detected a change in each of a plurality of input / cut signals in a fixed order with respect to a plurality of input / cut signals from a host control device. for that reason,
Since the power control signal may be sent in the wrong sequence by detecting the change of the turn-on / off signal of low priority,
To prevent this, the current state of the changed make / disconnect signal is used to determine whether it is a make sequence or a make sequence, and the change in the make / disconnect signal having a higher priority than the detected make / disconnect signal is examined. It was

[Problems to be Solved by the Invention]

The above-described conventional power supply control device, when detecting changes in a plurality of turn-on / off signals from the host control device, detects the changes in a certain order, and then turns-on with a higher priority than the change-on / turn-off signal. Since the change in the / disconnect signal is checked, there is a problem that it takes time from the change of the make / disconnect signal to transmission to the power supply by the serial data bus method.

[Means for solving the problem]

In order to solve such a problem, the power supply control device of the present invention includes a memory unit that receives a plurality of turn-on / off signals output from a host control device and stores the signals as data, and a data storage operation. Repeatedly, comparing the previously input data with the currently input data to obtain the changes of the plurality of turn-on / off signals, and connecting the power supply control signal according to the changes to the logic element configuring the information processing device. A plurality of power supplies to be connected by a serial data bus method to a plurality of power supplies, and a plurality of power-on / power-off sequences of a plurality of power-on / power-off signals sent from the host controller. A determination is made first, and each of the plurality of make / disconnect signals changes from "1" to "0" if it is in the make sequence, and changes from "0" to "1" in the make sequence. By appropriately setting, it is determined whether the input data is a closing sequence or a cutting sequence, and each change of the plurality of making / disconnecting signals is made in descending order of priority determined in advance in each of the making sequence or the cutting sequence. Upon detection, a serial data bus power supply control signal corresponding to the power-on / off sequence required by the logic element is sent to the power supply.

Here, the logic element that constitutes the information processing device generally has power supply terminals of a plurality of voltage types, and the power-on sequence is such that when the power is turned on, the power is turned on sequentially from a low output voltage to a high output voltage. In addition, in the disconnection sequence, the power supply with a high output voltage is sequentially disconnected from the power supply with a low output voltage in the power supply disconnection.

[Work]

In the present invention, by inputting a plurality of input / cut signals, it is possible to first determine the input sequence or the disconnection sequence by determining the input sequence or the disconnection sequence from the data stored when the data was input last time. Then, it is possible to detect changes in each of a plurality of input / cut signals in descending order of priority for each sequence.

〔Example〕

Hereinafter, the present invention will be described with reference to the drawings. First
FIG. 1 is a schematic configuration diagram of a power supply control system showing an embodiment of the present invention. In the figure, 11 is a microprocessor 11
host controller having a, 12 is also a power supply control device having a microprocessor 12a, the input of the plurality of output from the host controller 11 on / off signal 15 ₁ to 15 _n to the power control unit 12 . The power supply control device 12 stores a plurality of on / off signals 15 ₁ to 15 _n as input data to the memory section of the microprocessor in 12a, performs repeatedly the data storing operation, current and data previously entered By comparing the input data with the change of a plurality of turn-on / off signals, the power control signal according to the change is sent to various logic elements 14 constituting the information processing device via the serial data bus 16. Multiple power supplies connected 13 _{1 to} 13 _n
It is supposed to be transmitted by the serial data bus method.

Next, the operation of the above embodiment will be described with reference to the flow chart shown in FIG. Here, when the power is turned on, the power supply with a low output voltage is sequentially turned on to the power supply with a high output voltage (turn-on sequence), and when the power is turned off, the power supply with a high output voltage is sequentially turned off (cut off). since it is necessary to sequence), by the each of the plurality of on / off signals 15 ₁ to 15 _n from the host controller 11 to correspond to the output voltage to be turned-on corresponding to the low output voltage is on sequence It is assumed that the priority order is determined so that the / cut signal is detected first, and the priority order is determined so that the close / disconnect signal corresponding to a high output is detected first in the disconnect sequence.

Thus, when a plurality of output from the host controller 11 on / off signal 15 ₁ to 15 _n is input to the power supply control unit 12,
The power supply control device 12 puts data of a plurality of current turn-on / off signals, that is, current data (hereinafter referred to as NEWDATA) into a register (R1) in the microprocessor 12a (step 51), and makes a plurality of previous turn-on / turn-off signals. The data of the disconnection signal, that is, the previous data (hereinafter referred to as OLDDATA) is also put in the register (R2) in the microprocessor 12a (step 5).
2). Then, the exclusive OR (XOR) of these registers (R1) and (R2) can be used to obtain a plurality of changes (hereinafter referred to as DELTA) of the make / disconnect signals (step 53). At this time, the changed amount (DELTA) is "1" at the changed position of the make / disconnect signal, and is "0" at other positions. Further, the direction of change (hereinafter referred to as DIRECT) can be obtained by the logical product (AND) of the change amount (DELTA) and the previous data (OLDDATA) (step 54). Here, if the changed make / disconnect signal is "0" when it is the previous data (OLDDATA), it is "0", and if it is "1", it is "1", and the unchanged make / disconnect signal is "0". Becomes From this,
If all of the directions (DIRECT) are "0", it means that the make / disconnect signal has changed from "0" to "1", and in other cases, it can be seen that the signal has changed from "1" to "0". Then, as a result of the calculation, if all are "0", the flag becomes "1", and in other cases, the flag Z becomes "0". By inspecting the flag Z, the closing sequence is changed to the closing sequence. You can see what you are doing (step 55).
Here, if a plurality of turn-on / off signals have the meaning of power-on when they change from “1” to “0”, and have the meaning of power-off when they change from “0” to “1”, A is Input sequence, B becomes disconnection sequence, and each sequence
By having a program for observing each change of a plurality of turn-on / off signals in order of higher priority for A and B, power can be turned on or off for each sequence.

Considering an 8-bit signal as an example, as shown in Table 1 below, when the previous data (OLDSTS) is “FF” and the current data (NEWSTS) is “00”, the change (DELTA) is “F”.
Since the result of the previous data (OLDSTS) and the change (DELTA) is "FF", the Z flag will not become "1". At this time, it is understood that the bit change is changed from "1" to "0", and it can be determined that the change is during the closing sequence.

[Effects of the Invention] As described above, according to the present invention, a change in each of a plurality of input / cut signals is detected in the priority order determined for each sequence by first determining whether the input sequence is the disconnection sequence or the disconnection sequence. Therefore, there is an effect that it is possible to shorten the time from the change of the turn-on / off signal to the sending of the power supply control signal to the power supply by the serial data bus method.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, and FIG. 2 is a flow chart for explaining the operation of this embodiment. 11 ...... host controller, 12 ...... power supply control device, 12a ...... microprocessor, 13 ₁ to 13 _n ...... power, 14 ...... logic elements, 15 ₁ to 15 _n ...... on / off signal, 16 ... … Serial data bus.

Claims (1)

[Claims] 1. A plurality of inputs / outputs from a host controller.
A memory unit that inputs a disconnection signal and stores the signal as data, and this data storage operation are repeated, and the previously input data and the currently input data are compared to obtain the changes in the plurality of input / cut signals. And a power supply control signal corresponding to the change in the power supply control signal, which is transmitted from a plurality of power supplies connected to the logic elements forming the information processing apparatus by a serial data bus method, It is first judged which of the sequences of the plurality of incoming / cutting signals that are currently moving is in the sequence of on / off, and if it is during the closing sequence, each of the plurality of on / off signals is from "1" to "0". , And if it is in the cutting sequence, set to change from “0” to “1” and judge whether this input data is the input sequence or the cutting sequence,
Corresponding to the turn-on / turn-off sequence of the power supply required by the logic element by detecting the change of each of the plurality of turn-on / turn-off signals in the order of the predetermined priority in each of the turn-on sequence or the turn-off sequence. A power supply control device characterized in that a power supply control signal of a serial data bus system is sent to the power supply.