JPH07146921A - State display device for memory card - Google Patents

Abstract

PURPOSE:To effectively prevent information stored on a memory card from disappearing by displaying the inhibition of the inserting/extracting operation for the memory card in access. CONSTITUTION:This device is equipped with a control part 1 which reads and writes data on and out of the memory card 2, a timer 4 which uses a read/write control signal for the memory card outputted from the control part 1 as an input trigger and outputs an LED driving signal, and an LED 5 which makes an illumination display on the basis of the output of the timer 4. The control part 1 has an illumination control function which controls the illumination of the LED 5 through the timer 4 while data are read out or written on the memory card 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a memory card status display device, and more particularly to a memory card status display device for effectively protecting data in a memory card.

[0002]

2. Description of the Related Art A conventional memory card status display device is
It is equipped with a lamp that blinks when a memory card that has exceeded the guaranteed number of rewrites is inserted into the reader / writer and that lights up during operation with an external device, and its control means.

[0003]

In this conventional memory card status display device, it is determined that the memory card is in operation by data transmission / reception with an external device, and LE is used.
Since D is lit, an external device is always required, and since data transmission / reception with the external device and access to the memory card are asynchronous, there is the inconvenience that the status of the memory card cannot be displayed in real time. As a result, the timing of inserting / removing the memory card is confused, sometimes the memory card is removed during the access, and the information in the memory card is erased.

[0004]

It is an object of the present invention to improve the disadvantages of the conventional example, and particularly to display the prohibition of the insertion / removal operation of the memory card during access, thereby effectively preventing the disappearance of the stored information in the memory card. It is an object of the present invention to provide a card status display device.

[0005]

According to the present invention, a control unit for reading and writing data from and to a memory card, and a timer for outputting an LED drive signal using a read / write control signal for the memory card output from the control unit as an input trigger. And an LED that performs lighting display based on the timer output. The control unit has a lighting control function for controlling lighting of the above-mentioned LED via a timer while reading / writing data from / to the memory card. This aims to achieve the above-mentioned object.

[0006]

[Operation] While the memory card is being accessed, the LED is controlled to be turned on by the action of the control unit and the timer, so that the insertion / removal of the memory card is prohibited while the LED is on.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In the embodiment shown in FIGS. 1 and 2, a CPU 1 as a control unit for reading and writing data from and to a memory card 2 and an LED drive driven by a read / write control signal for the memory card output from the CPU 1 as an input trigger. A timer 4 that outputs a signal and an LED 5 that performs lighting display based on the output of the timer 4 are provided. The CPU 1 described above is provided with a lighting control function for controlling the lighting of the LED 5 described above via the timer 4 while reading / writing data from / to the memory card 2.

Further, the timer 4 has a lighting holding function for holding the lighting state of the LED 5 for a certain period of time after the CPU 1 completes the control of reading / writing data from / to the memory card 2.

This will be described in more detail. First, the CPU 1 reads / writes data stored in the memory card 2 (R /
W) is controlled. The read / write control signal (R / W control signal) 1a for the memory card is activated by a command from the CPU 1 while the memory card 2 is being accessed.
Entered in. In this timer 4, the R / W control signal 1a
From the time when is activated, counting of the basic timer clock C consisting of “cycle / μs” is started, and the LED driving signal 4a is activated. LED drive signal 4a
Keeps the active state until the timer 4 counts the basic timer clock C 100,000 times, that is, 0.1 seconds, and continues to turn on the LED 5 during this period.

In the timer 4, if the memory card R / W signal 1a becomes active again during counting, the counting also starts from 0 again.

Next, the time chart of FIG. 2 will be described.

In the initial state, the LED driving signal 4a is at a low level and the LED 5 is off. At the point where the memory card R / W signal 1a becomes low level, for example, at point A, the LED driving signal 4a becomes high level and the LED
5 lights up. Then, from the point A, the timer basic clock C
Starts the counting, but at point B, the memory card R / W signal 1a becomes low level again, and the counting returns to the initial value again. After that, for 100 [mS],
Since the memory card R / W signal 1a does not go to low level, the LED driving signal 4a goes to low level, which turns off the LED 5.

[0014]

Since the present invention is constructed and functions as described above, according to this, the LED is controlled to be turned on by the action of the control section and the timer during the access of the memory card.
While the LED is lit, the insertion / removal of the memory card is prohibited and displayed, thereby providing an unprecedented excellent memory card status display device that can effectively protect the data held in the memory card. be able to.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a time chart showing an operation example of FIG.

[Explanation of symbols]

 1 CPU as control unit 1a R / W control signal for memory card 2 Memory card 4 timer 4a LED driving signal 5 LED C timer basic clock

Claims (2)

[Claims] 1. A control unit for reading / writing data from / to a memory card, a timer for outputting an LED drive signal using a read / write control signal for the memory card output from the control unit as an input trigger, and a timer output based on the timer output. An LED that performs a lighting display, and the control unit controls the LED via the timer while data is being read from or written to the memory card.
A status display device for a memory card having a lighting control function for controlling lighting of a memory card. 2. The timer has a lighting holding function for holding the lighting state for a certain period of time after the control unit reads and writes data to and from the memory card. 1. A status display device for a memory card according to 1.