JPS63204386A - Electronic equipment capable of attaching/detaching external memory - Google Patents

Abstract

PURPOSE:To prevent the failure of an equipment even when a memory is erroneously removed at the time of charging a power source by providing a buffer between the mounting means of the external memory and an electronic equipment main body and disposing a control means for bringing the buffer to an inoperative state according to the mounting state of the external memory. CONSTITUTION:A control circuit 4 detects the state of a signal line 7 from the lock detecting SW of a connection unit 2, when the connection unit 2 is locked, a buffer control signal line 5 is operated, and when it is not locked, and buffer control signal line 5 is brought to the inoperative state. According to a signal from this buffer control signal line 5, the buffer is operated or not operated. Thereby, at the time of charging the power source, a trouble relating to the removal of the external memory 1 can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electronic device with a removable external memory, and particularly to an electronic device with a removable external memory that exchanges data with the external memory via a buffer. related to electronic equipment.

[Prior Art] For example, font cartridges, additional memory bags, memory cards, etc. have been used as removable external memories. These memories are directly electrically connected to a control circuit inside the recording apparatus, as shown in FIG.

[Problems to be Solved by the Invention] However, in this case, when the power is turned on and the connection is performed, noise such as chattering generated from the joint may cause
The control circuit of the main unit is adversely affected, causing problems such as malfunction or runaway of the control circuit. A countermeasure against this problem is to prohibit the installation or removal of memory while the power is on, but this is inconvenient for the user, and if the memory is accidentally installed or removed while the power is on, the control Problems have arisen in which circuits run out of control and equipment breaks down.

[Means for solving the problem] In order to solve this problem, the present invention provides a buffer between the external memory mounting means and the main body of the electronic device, and disables or disables the buffer according to the state of the external memory mounting means. It is provided with a control means for setting it in an operating state.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of the present invention. Here, 1 is an external memory, 2 is a coupling unit with a lock function, and 3
is a buffer for separating the internal bus 9 and external bus 8. Internal bus 9 and external bus 8 include a data bus, address bus, and memory control signals. Reference numeral 4 denotes a control circuit that exchanges data with the external memory 1 and controls the entire electronic device.This control circuit has a ROW that stores a control program according to the flowchart of FIG. 7 is a signal line of a lock detection SW included in the coupling unit 2.

The control circuit 4 detects the state of the signal line 7 from the lock detection SW of the coupling unit 2, and if the coupling unit 2 is in the locked state, sets the buffer control signal line 5 to the operating state, and if it is not in the locked state, sets the buffer control signal line 5 to the operating state. The signal line 5 is brought into a non-operating state. According to the signal from the buffer control signal line 5, the buffer 3 is placed into an active state or a non-active state.

6 is a signal for detecting the coupling state between the coupling unit 2 and the external memory l. In order to increase the reliability of the system, the control circuit 4 detects an AND state between the lock detection signal 7 and the coupling detection signal 6 when controlling the buffer control signal line 5, and sets the buffer control signal 5 to the operating state. , it is conceivable to control. FIG. 2 shows a flowchart of control in the present invention.

In step Sl, the control circuit 4 is initialized, and in step S2, it is determined whether or not it is in a locked state based on a signal from the lock detection signal 7.

If it is in the locked state, in step S5, the buffer control signal line 5 puts the buffer 3 into the operating state, that is, the external bus 8 and internal bus 9 are connected between the external memory 1 and the control circuit 4.
Data communication is made possible through the step S6. In step S6, general control is performed.

On the other hand, if it is not in the locked state in step S2, the process moves to step S3 and external memory error processing is performed.Here, the buffer 3 is set to a non-operating state by the buffer control signal line 5, and the CRT! Display an error on O,
The buzzer 21 is sounded, and in step S4, it is determined whether or not the lock is in the lock state based on the signal from the lock detection signal 7. Steps S3 and 34 are repeated until the lock is reached, and when the lock is reached, the process proceeds to step S5. Transfer.

FIG. 3 shows an example of the configuration of the present invention. In FIG. 3, lO is the exterior of the electronic device, 12 is a storage cover for the external memory l, and 16 is an operation knob. When installing or removing external memory l, remove storage cover 1.
2 is pushed upward along the cover guide 11.

At this time, the switch 13 is arranged as a pole that turns OFF (or ON) as the cover 12 is pushed up,
15 is a memory cart connector that performs lock detection;
14 is the main PCB.

With the above configuration, when inserting or removing the memory card l, the memory card storage cover 12 must be opened, and lock detection is performed in conjunction with the opening and closing of the cover, so that when the memory card is inserted or removed, the external bus and internal It becomes possible to separate the bus.

In the present invention, the coupling unit shown in FIG.
In the figure, a storage cover 12, a pinch of cover 16. Cover switch 13, cover guide 11, memory card connector 1
Consisting of 5.

[Other Embodiment 1] In order to improve reliability, in addition to isolating the pass lines, the power supply is also cut off. For example, after disconnecting the external bus,
It is conceivable to turn off the power to the external memory using a transistor or the like.

[Effect] It is possible to prevent troubles related to attaching and detaching external memory while the power is on.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the present invention, FIG. 2 is a flowchart showing a control procedure of the present invention, FIG. 3 is a configuration diagram of the present invention, and FIG. 4 is a block diagram of a conventional example. In the figure, 1 is an external memory, 2 is a coupling unit, 4 is a control circuit, 6 is a coupling detection signal, and 9 is an internal bus. Tomi 20

Claims (1)

[Scope of Claims] External memory mounting means to which an external memory can be attached and removed; an electronic device main body that exchanges data with the external memory mounted on the external memory mounting means; and the external memory mounting means and the 1. An electronic device to which an external memory can be attached or removed, comprising: a buffer means provided between the electronic device body and a control means for setting the buffer means in a non-operating state according to a state of the external memory mounting means.