JP3263590B2 - Electronics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device for executing a prescribed process using an oscillation clock of a clock oscillator, and more particularly, to a case where a plurality of clock oscillators are mounted.
The present invention relates to an electronic device that can automatically detect a mounting error of a clock oscillator.

[0002]

2. Description of the Related Art If the prior art is described by taking a laser printer as a specific example, the laser printer is provided with a video clock oscillator for generating a video clock which is a reference of one dot interval, so that a prescribed printing density can be obtained. Has been realized.

In this laser printer, a plurality of printing densities may be prepared. In such a case, a plurality of video clock oscillators are mounted on a printed board.

Conventionally, when manufacturing a laser printer in which a plurality of video clock oscillators are mounted, an operator of a manufacturing line checks the model numbers printed on the video clock oscillators to check the video clocks. The method was to check whether the oscillator was correctly mounted on the printed board.

[0005]

However, the video clock oscillator mounted on the laser printer usually has the same appearance. Therefore, there is a limit in the visual inspection by the operator, and there is a problem that a video clock oscillator having a frequency different from the original one is erroneously mounted. Such a manufacturing error can be found in the final stage of inspection after assembling the laser printer device. Therefore, according to the related art, there is a problem that the number of working steps due to the manufacturing error increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a new electronic device that can automatically detect a mounting error of a clock oscillator when a plurality of clock oscillators are provided. Aim.

[0007]

FIG. 1 shows the principle configuration of the present invention. In the figure, reference numeral 1 denotes an electronic device equipped with the present invention, which is provided with a plurality of clock oscillators 3 oscillating at different frequencies separately from a system clock oscillator 2 prepared for driving a system, and a selected clock oscillator. 3 performs a prescribed process using the oscillation clock of No. 3.

An electronic apparatus 1 of the present invention whose principle configuration is shown in FIG. 1A includes a timer means 10 for counting an oscillation clock of a system clock oscillator 2 to perform a timer operation, and an external device.
Selects the oscillation clock of the external clock oscillator provided in
And the selection makes the system clock oscillator 2 legitimate.
If There is confirmed, the selection means 11 for selecting one of the oscillation clock of the clock oscillator 3 in sequence, counting means for counting the oscillation clock selected in the selection means 11 12
And evaluation means 13 for evaluating the validity of the system clock oscillator 2 and the clock oscillator 3.

On the other hand, the electronic device 1 of the present invention illustrating the basic configuration in FIG. 1 (b), the external clock onset provided outside
Select the oscillation clock of the vibrator, and select
Oscillation clock when the validity of the clock generator 2 is confirmed, the selection means 20 for selecting one of the oscillation clock click b <br/> click oscillator 3 in the order, the selection of the selection means 20 a timer means 21 for performing the timer operation by counting, a counting means 22 for counting the oscillation clock of the system clock oscillator 2, Ru and an evaluation unit 23 for evaluating the validity of the system clock oscillator 2 and the clock oscillator 3.

[0010] In the electronic apparatus 1 of the present invention illustrating the principle configuration comprised Figure 1 (a) as this, the selection means 11
First, an external clock oscillator provided externally
The oscillating clock is selected and the counting means 12
Is the oscillation clock of the external clock oscillator provided externally.
Start counting clocks. In response to the start of counting, the timer
The stage 10 controls the oscillation clock of the system clock oscillator 2.
Start counting and when the count reaches the specified value
In response to this, the evaluation means 13 outputs the
When the output means outputs the output signal, the counting means 12
Read the count value of the
The validity of the clock oscillator 2 is evaluated.

Confirmation of validity of system clock oscillator 2
Then, the selection means 11 continues to operate the clock oscillator 3
One of the oscillation clocks of
Thus, the counting means 12 generates the clock of the selected clock oscillator 3.
The counting of the oscillation clock is started. In response to the start of counting,
Timer means 10 starts the counting of the oscillation clock of the system clock oscillator 2, and outputs to that effect when its count value reaches a prescribed value, in response to this, the evaluation means 13
Reads the count value of the counting means 12 when the timer means 10 outputs an output signal, and according to the counted value,
The validity of the clock oscillator 3 selected by the selection means 11 is evaluated.

Meanwhile, in the electronic apparatus 1 of the present invention illustrating the basic configuration in FIG. 1 (b), selecting means 20, first of all,
The oscillation clock of an external clock oscillator
In response to this selection, the counting means 22
The counting of the oscillation clock of the clock oscillator 2 is started. This meter
In response to the start of the counting, the timer means 21 selects the selection means 20.
Select the oscillation clock of the external clock oscillator provided externally.
Starts counting clocks, and the count reaches the specified value
Sometimes, the fact is output, and in response to this, the evaluation means 23
Is counted when the timer means 21 outputs an output signal.
Reading the count value of the means 22, according to the count value,
The validity of the system clock oscillator 2 is evaluated.

Confirmation of validity of system clock oscillator 2
Then, the selection means 20 continues to operate the clock oscillator 3
One of the oscillation clocks of
In addition, the counting means 22 controls the oscillation of the system clock oscillator 2
Start counting clocks. In response to the start of the counting, the timer means 21 starts counting the oscillation clock of the clock oscillator 3 selected by the selecting means 20, and when the count value reaches the specified value, the timer means 21 is notified. Output and receiving this,
Evaluation means 23, when the timer unit 2 1 outputs an output signal, reads the count value of the counting means 22, in accordance with the count value, the clock oscillator 3 to select the selection means 20
Evaluate the legitimacy of

[0014] As of this, in the electronic device 1 of the present invention, previously
First, the oscillation of the external clock oscillator provided externally
Generates the system clock based on the clock
Checks the oscillation frequency of vibrator 2 and implements it
When the validity of the clock oscillator 2 is confirmed, the validity
As the confirmed sheet relative to the oscillation clock of system clock oscillator 2, et whether to adopt a configuration for automatically checking a plurality of oscillation frequency of the clock oscillator 3 is mounted, cis
Temu clock generator 2 and ing to allow automatic detection of implementation mistakes clock oscillator 3.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail according to embodiments. The present invention is applied to, for example, a laser printer device that realizes different printing densities by using a plurality of video clocks, and realizes prevention of mounting errors of a video clock oscillator that generates the video clocks.

FIG. 2 shows an embodiment of the present invention. In this embodiment, a CPU 50, a ROM 51, a system clock oscillator 52, a plurality of video clock oscillators 5,
3 and a video clock oscillator 53 on a control printed board 100 on which a timer 54 for counting the oscillation clock of the system clock oscillator 52 and generating a timer interrupt is mounted.
And an oscillation clock of an external clock oscillator 200 prepared outside the apparatus as inputs.
In this configuration, a selector 55 for selecting one of them and a counter 56 for counting the oscillation clock selected by the selector 55 are adopted. Here, the frequency of the oscillation clock of the external clock oscillator 200 is known.

FIG. 3 shows an embodiment of a processing flow executed by an inspection program for checking a mounting error of the video clock oscillator 53. When the inspection program for realizing the present invention follows the embodiment of FIG. 2 , as shown in the processing flow of FIG. 3 , first, in step 1, the selector 55 selects the oscillation clock of the external clock oscillator 200 in step 1. To control.

Subsequently, in step 2, the timer 54 is instructed to start timing and the counter 56 is instructed to reset, and then the counting of the oscillation clock of the external clock oscillator 200 selected by the selector 55 is performed. Instruct to start. When the timer 54 receives the time counting instruction from the inspection program in this way, the timer 54 starts the time counting process by counting the oscillation clock of the system clock oscillator 52, and notifies the CPU 50 of the timer interrupt after the lapse of the specified time. , The counting process of the counter 56 is stopped.

In step S3, the inspection program waits for a timer interrupt from the timer 54 to be notified. When the timer interrupt is notified, the program proceeds to step S4, where the count value of the counter 56 is counted. By reading and checking whether or not the count value indicates a prescribed value, it is checked whether or not the system clock oscillator 52 has a mounting error.

Subsequently, in step 5, it is determined whether or not there is a mounting error in the system clock oscillator 52 by checking in step 4, and when it is determined that there is a mounting error, the process proceeds to step 6, where the check is performed. Output the result and end the process. On the other hand, when it is determined that there is no mounting error in the system clock oscillator 52, the process proceeds to step 7, where it is determined whether or not the unprocessed video clock oscillator 53 remains. , And proceeds to step 8 to select one of the video clock oscillators 53 and control the selector 55 to select the oscillation clock of the video clock oscillator 53.

Subsequently, in step 9, the timer 54 is instructed to start timing and the counter 56 is instructed to reset, and then the counting of the oscillation clock of the video clock oscillator 53 selected by the selector 55 is performed. Instruct to start.

Subsequently, in step 10, the process waits for the timer 54 to be notified of the timer interrupt. When the timer interrupt is notified, the process proceeds to step 11, where the count value of the counter 56 is read, and By checking whether or not the count value indicates a specified value, it is checked whether or not there is a mounting error in the selected video clock oscillator 53, and the process returns to step S7.

When it is determined in step 7 that all of the video clock oscillators 53 have been processed, the process proceeds to step 6, where the check results performed in steps 4 and 11 are output, and the process is terminated.

As described above, in the embodiment shown in FIG. 2 , first, the system clock oscillator 52 is checked using the oscillation clock of the external clock oscillator 200, and then the oscillation clock of the system clock oscillator 52 is used. By checking the video clock oscillator 53, the system clock oscillator 52 / video clock oscillator 53
It automatically checks whether there is a mounting error in the system.

FIG. 4 shows another embodiment of the present invention.
In this embodiment, a first counter 57 for counting the oscillation clock of the system clock oscillator 52 is provided on a control printed board 100 on which a CPU 50, a ROM 51, a system clock oscillator 52, and a plurality of video clock oscillators 53 are mounted. And an oscillation clock of the video clock oscillator 53 and an external clock oscillator 200 provided outside the apparatus.
Selector 55 that receives one of the oscillation clocks as an input, selects one of them, a second counter 58 that counts the oscillation clock selected by the selector 55, and a second counter 5
The comparator 59 outputs a coincidence signal when the count value of the counter 8 reaches the specified value, stops the counting process of the first counter 57, and notifies the CPU 50 of an interrupt.
Is adopted.

FIG. 5 shows an embodiment of a processing flow executed by the inspection program according to this embodiment. Test program, in the case according to an embodiment of FIG. 4, FIG.
As shown in the processing flow of FIG.
Thus, the control is performed so that the selector 55 selects the oscillation clock of the external clock oscillator 200.

Subsequently, in step 2, the first counter 5
7 instructs a reset, and then instructs the system clock oscillator 52 to start counting the oscillating clock, and instructs the second counter 58 to reset, and then outputs the external clock selected by the selector 55. Oscillator 2
Instruct the start of the 00 oscillation clock counting. Upon receiving the count instruction from the inspection program in this way, the second counter 58 starts counting the oscillation clock of the external clock oscillator 200, and the comparator 59 determines that the count value reaches the specified value. By outputting a signal, an interrupt is notified to the CPU 50 and the counting process of the first counter 57 is stopped.

The test program waits for the coincidence signal from the comparator 59 to be notified in the subsequent step 3, and when the coincidence signal is notified, proceeds to step 4 where the count value of the first counter 57 By reading and checking whether the count value indicates the specified value,
It is checked whether the system clock oscillator 52 has no mounting error.

Subsequently, in step 5, it is determined whether or not there is a mounting error in the system clock oscillator 52 by the check in step 4, and when it is determined that there is a mounting error, the process proceeds to step 6, where the check is performed. Output the result and end the process.

On the other hand, when it is determined that there is no mounting error in the system clock oscillator 52, the process proceeds to step 7, where it is determined whether or not the unprocessed video clock oscillator 53 remains. When the determination is made, the process proceeds to step 8, wherein one video clock oscillator 53 is selected, and the selector 55 is controlled so as to select the oscillation clock of the video clock oscillator 53.

Subsequently, at step 9, the first counter 5
7 is instructed to reset, and then instructed to start counting the oscillation clock of the system clock oscillator 52, and instructed to reset the second counter 58, the video clock selected by the selector 55 Instructs the oscillator 53 to start counting.

Subsequently, at step 10, the comparator 5
9 is notified of the coincidence signal, and when the coincidence signal is notified, the process proceeds to step 11 where the first counter 5
7 is read, and it is checked whether or not the selected video clock oscillator 53 has a mounting error by checking whether or not the count value indicates a specified value.
Return to step 7.

When it is determined in step 7 that all the video clock oscillators 53 have been processed, the process proceeds to step 6, where the check results performed in steps 4 and 11 are output, and the process is terminated.

As described above, in the embodiment shown in FIG. 4 , first, the system clock oscillator 52 is checked using the oscillation clock of the external clock oscillator 200, and then, the oscillation clock of the system clock oscillator 52 is used. By checking the video clock oscillator 53, the system clock oscillator 52 / video clock oscillator 53
It automatically checks whether there is a mounting error in the system.

[0035] FIG. 6 illustrates a technique related to the present onset Akira. The difference between the related art and the embodiment shown in FIG. 2 this is FIG.
In second embodiments, while the timer 54 counts the oscillation clock of the system clock oscillator 52, this related technique
In operation, the oscillation clock of the external clock oscillator 200 is counted (however, this counting is performed only at the time of inspection, and the oscillation clock of the system clock oscillator 52 is counted during normal operation).
A point of, in the embodiment of FIG. 2, whereas those to be input to the selector 55 is a video clock generator 53 and the external clock oscillator 200, in this related art, the video clock generator 53 and the system clock oscillator 52 is the input point.

[0036] This difference in structure, the test program, in the case according to an embodiment of FIG. 2, in step 1 of the process flow of FIG. 3, the selector 55 is an external clock oscillator 20
0 against to select the oscillation clock, this related technology
7 , the selector 55 executes the processing flow of FIG. 7 in which the oscillation clock of the system clock oscillator 52 is selected.

That is, as shown in the processing flow of FIG. 7 , first, in step 1, control is performed so that the selector 55 selects the oscillation clock of the system clock oscillator 52.

Subsequently, in step 2, the timer 54 is instructed to start time measurement, the counter 56 is instructed to reset, and then the selector 55 is instructed to start counting by the system clock oscillator 52 selected by the selector 55. I do. When the timer 54 receives the timing instruction from the inspection program in this way, the timer 54 starts the time counting process by counting the oscillation clock of the external clock oscillator 200, and notifies the CPU 50 of the timer interrupt after the lapse of the specified time. , The counting process of the counter 56 is stopped.

The inspection program waits for the timer 54 to be notified of the timer interrupt in the subsequent step 3, and when the timer interrupt is notified, proceeds to step 4 where the count value of the counter 56 is counted. By reading and checking whether or not the count value indicates a prescribed value, it is checked whether or not the system clock oscillator 52 has a mounting error.

Subsequently, in step 5, it is determined whether or not there is a mounting error in the system clock oscillator 52 by the check in step 4, and when it is determined that there is a mounting error, the process proceeds to step 6, where the check is performed. Output the result and end the process.

On the other hand, when it is determined that there is no mounting error in the system clock oscillator 52, the process proceeds to step 7, where it is determined whether or not the unprocessed video clock oscillator 53 remains. When the determination is made, the process proceeds to step 8, wherein one video clock oscillator 53 is selected, and the selector 55 is controlled so as to select the oscillation clock of the video clock oscillator 53.

Subsequently, in step 9, the timer 54 is instructed to start timing and the counter 56 is instructed to reset, and then the counting of the oscillation clock of the video clock oscillator 53 selected by the selector 55 is performed. Instruct to start.

Subsequently, in step 10, the process waits for the timer 54 to be notified of the timer interrupt. When the timer interrupt is notified, the process proceeds to step 11, where the count value of the counter 56 is read, and By checking whether or not the count value indicates a specified value, it is checked whether or not there is a mounting error in the selected video clock oscillator 53, and the process returns to step S7.

If it is determined in step 7 that all the video clock oscillators 53 have been selected, the process proceeds to step 6, where the results of the checks performed in steps 4 and 11 are output, and the process ends.

As described above, the present invention relates to the present invention shown in FIG.
In this technique, the system clock oscillator 52 / video clock oscillator 53 is checked using the oscillation clock of the external clock oscillator 200, and it is automatically determined whether or not there is a mounting error in the system clock oscillator 52 / video clock oscillator 53. Inspection is carried out.

[0046] Figure 8 is <br/> illustrates another related art relating to the present onset bright. The difference between the embodiments shown in the related art and FIG. 4 of this, in the embodiment of FIG. 4, while the first counter 57 counts the oscillation clock of the system clock oscillator 52, in this related art are that counts the oscillation clock of the external clock oscillator 200, in the embodiment of FIG. 4, whereas those to be input to the selector 55 is a video clock generator 53 and the external clock oscillator 200, this related
In the technique, a video clock oscillator 53 and a system clock oscillator 52 are input.

[0047] This difference in structure, the test program, in the case according to an embodiment of FIG. 4, in step 1 of the process flow of FIG. 5, the selector 55 is an external clock oscillator 20
0 against to select the oscillation clock, this related technology
If according to would selector 55 executes the processing flow of FIG. 9 that selects an oscillation clock of the system clock oscillator 52.

That is, as shown in the processing flow of FIG. 9 , first, in step 1, control is performed so that the selector 55 selects the oscillation clock of the system clock oscillator 52.

Subsequently, in step 2, the first counter 5
7 instructs a reset, and then instructs the external clock oscillator 200 to start counting the oscillation clock, and instructs the second counter 58 to reset, and then sets the system clock selected by the selector 55. Instructs to start counting the oscillation clock of the oscillator 52. Upon receiving the count instruction from the inspection program in this way, the second counter 58 starts counting the oscillation clock of the system clock oscillator 52, and the comparator 59 determines that the count value reaches the specified value. By outputting a signal, the CPU 50 is notified of the interrupt and the first
Of the counter 57 is stopped.

In step S3, the test program waits for a match signal from the comparator 59 to be notified. When a match signal is notified, the program proceeds to step S4. By reading and checking whether the count value indicates the specified value,
It is checked whether the system clock oscillator 52 has no mounting error.

Subsequently, in step 5, it is determined whether or not there is a mounting error in the system clock oscillator 52 by the check in step 4, and when it is determined that there is a mounting error, the process proceeds to step 6, where the check is performed. Output the result and end the process.

On the other hand, when it is determined that there is no mounting error in the system clock oscillator 52, the process proceeds to step 7, where it is determined whether or not the unprocessed video clock oscillator 53 remains. When the determination is made, the process proceeds to step 8, wherein one video clock oscillator 53 is selected, and the selector 55 is controlled so as to select the oscillation clock of the video clock oscillator 53.

Subsequently, at step 9, the first counter 5
7 instructs a reset and then instructs the external clock oscillator 200 to start counting the oscillating clock, and instructs the second counter 58 to reset and then selects the video clock selected by the selector 55. Oscillator 5
Instruct the start of counting of 3.

Subsequently, at step 10, the comparator 5
9 is notified of the coincidence signal, and when the coincidence signal is notified, the process proceeds to step 11 where the first counter 5
7 is read, and it is checked whether or not the selected video clock oscillator 53 has a mounting error by checking whether or not the count value indicates a specified value.
Return to step 7.

If it is determined in step 7 that all the video clock oscillators 53 have been selected, the process proceeds to step 6, where the results of the checks performed in steps 4 and 11 are output, and the process is terminated.

Thus, the present invention is related to the present invention shown in FIG.
In this technique, the system clock oscillator 52 / video clock oscillator 53 is checked using the oscillation clock of the external clock oscillator 200, and it is automatically determined whether or not there is a mounting error in the system clock oscillator 52 / video clock oscillator 53. Inspection is carried out.

Although the present invention has been described in detail with reference to the illustrated embodiments, the present invention is not limited thereto. For example, in the embodiments, the present invention is disclosed assuming application to a laser printer, but the present invention is not limited to this.

[0058]

As described above, in the electronic apparatus of the present invention, when a plurality of clock oscillators other than the system clock oscillator are provided , first , the electronic equipment is provided outside.
Based on the oscillation clock of the external clock oscillator
Automatically check the oscillation frequency of the system clock oscillator.
And click, followed by, based on the oscillation clock of the evaluated system clock oscillator validity, or to adopt a configuration to automatically check the oscillation frequency of their clocks oscillator
Automatically detects system clock oscillator mounting errors
Together it becomes possible way, ing as implementation mistakes their clock oscillator can be detected automatically.

[Brief description of the drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is an embodiment of the present invention.

FIG. 3 is an example of a processing flow of an inspection program.

FIG. 4 is another embodiment of the present invention.

FIG. 5 is an example of a processing flow of an inspection program.

FIG. 6 is a book onset Akira to the relevant technology.

FIG. 7 is a processing flows of the inspection program.

FIG. 8 is another technology related to the present onset Akira.

FIG. 9 is a processing flows of the inspection program.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 electronic device 2 system clock oscillator 3 clock oscillator 10 timer means 11 selecting means 12 counting means 13 evaluating means 20 selecting means 21 timer means 22 counting means 23 evaluating means

Continuation of front page (56) References JP-A-4-326410 (JP, A) JP-A-64-38814 (JP, A) JP-A-62-144219 (JP, A) JP-A-62-191940 (JP) JP-A-5-265587 (JP, A) JP-A-9-16281 (JP, A) JP-A-5-80872 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB G06F 1/04 302 G06F 1/04 301 G06F 1/06 G06F 11/22 G01R 31/28 H03B 5/32

Claims (2)

(57) [Claims] 1. An electronic device comprising a plurality of clock oscillators oscillating at different frequencies separately from a system clock oscillator and executing a specified process using an oscillation clock of the selected clock oscillator. Timer means for counting the oscillating clock of the oscillator and outputting an indication when the counted value reaches a specified value, and an oscillating clock of an external clock oscillator provided outside.
And select the above system clock oscillator
When the validity is confirmed, selection means for selecting one of the oscillation clock of the upper Symbol clock generator in order, in synchronism with the start of counting of the timer means, the oscillation clock selected in the selection means counting means for counting, when said timer means outputs an output signal, reads the count value of said counting means, for selecting the system clock oscillator and the upper Symbol clock oscillator you of the selection means in accordance with the regimen numerical An electronic device comprising: an evaluation unit that evaluates validity. 2. Apart from the system clock oscillator, a plurality of clock oscillators oscillating at different frequencies, in the electronic apparatus to execute the processing specified using the oscillation clock of the clock oscillator is selected, provided outside External clock oscillator
And select the above system clock oscillator
When the validity is confirmed, selection means for selecting one of the oscillation clock of the upper Symbol clock generator in order, by counting the oscillation clock selected in the selection means, the regimen numerical specified value When the timer means outputs a signal, the timer means outputs the signal in synchronization with the start of timing of the timer means, and the counting means counts the oscillation clock of the system clock oscillator. in, it reads the count value of said counting means, in that it comprises an evaluation means for evaluating the validity of the selection to that said system clock generator及 beauty above Symbol clock oscillator of the selection means in accordance with the regimen numeric, characterized Electronics.