JP2526012B2 - Data processing device and communication method for data processing - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data processing device and a data processing communication method.

[0002]

2. Description of the Related Art Conventionally, in a small computer such as a palm top, a built-in keyboard is integrally built in a main body. Usually, this built-in keyboard is small and it is difficult to operate the keys. Therefore, there is a user's request to connect a large external keyboard to improve operability.

In order to meet such demands, recently, a small computer which can be connected to an external keyboard and has an embedded keyboard has appeared. However, competition between input data from the embedded keyboard and input data from the external keyboard. Since it is difficult to control, the method of disabling the built-in keyboard is adopted when the external keyboard is connected.

[0004]

Recently, there is a demand for connecting a bar code reader to the interface of an external keyboard and using it for inventory management. In this case, the bar code reader is adapted to generate a scan code similar to an external keyboard.

However, as described above, in the related art, the method of disabling the built-in keyboard is adopted in the state where the external keyboard (input device) is connected, so that the state in which the bar code reader is connected is used. In, the built-in keyboard cannot be used. Therefore, for example, while scanning the bar code of the article with a bar code reader and reading the code, with the built-in keyboard,
There was the inconvenience that operations such as typing in quantities were completely impossible.

[0006] Applicant's US patent application No. 953613, filed Sep. 26, 1992, relates to an apparatus for controlling a single cursor using multiple input devices, in which device Controlling a single cursor with multiple input devices is accomplished by placing a selection controller between a single mouse port and a series of mouse-like devices. At this time, each mouse-like device receives signals from and sends signals to the computer system. However, these signals are transferred to the computer system through the selection controller. That is, the selection controller acts as a switch that selects which mouse-like device is connected to the input port of the computer system. However, the invention of this U.S. patent application uses a single mouse port and cannot be applied to a controller for connecting a plurality of individual keyboards as described above. Also, the mouse port is usually a serial port, which is quite different from the keyboard interface that generates the scan code.

The present invention has been made under such circumstances, and an object thereof is to enable the built-in keyboard and the external input device selectively or simultaneously as needed when the external input device is connected ( It is to provide a data processing device and a communication method for data processing which can be activated.

[0008]

According to the first aspect of the present invention,
A processor for processing data, a controller connected to the processor via a system bus, connected to an embedded keyboard via a first interface, and connected to an external input means via a second interface. And a validating means for validating the external input means in response to the absence of any data or command from the processor to the embedded keyboard, the data processing device comprising: With the external input means enabled,
First data transmission means for receiving data or a command from the external input means and transmitting the data or command to the processor in response to the presence of one of the data and the command from the external input means, and the external input means is enabled. In this state, there is one of invalidating means for invalidating the external input means in response to the absence of any data or command from the external input means, and one of the data and command from the built-in keyboard. Second data transmission means for transmitting data or commands from the built-in keyboard to the processor in response thereto.

According to a second aspect of the present invention, in the data processing apparatus according to the first aspect, the housing is provided with the built-in keyboard, the processor and the controller are built in the housing, and the external input means is provided in the housing. And a connecting means detachably connectable to the controller.

According to a third aspect of the present invention, in the data processing device according to the first aspect, the first interface is a parallel interface and the second interface is a serial interface.

According to a fourth aspect of the present invention, in the data processing apparatus according to the first aspect, the external input means is any one of an external keyboard, a bar code reader and a card reader. .

According to a fifth aspect of the invention, in the data processing apparatus according to the first aspect, the external input means has a buffer for temporarily storing the data to be sent,
The data stored in the buffer is retransmitted in response to a retransmission request command from the keyboard controller.

According to a sixth aspect of the present invention, in the data processing apparatus according to the first aspect, the command transmitted to the processor is a command other than a resend request command for making a resend request for at least one of data and a command. Characterize.

According to a seventh aspect of the present invention, a processor for processing data is connected to the processor via the system bus and is also connected to the built-in keyboard via the first interface. A data processing device including a controller connected via an interface of the controller and an external input means connected to the controller via the second interface. However, the external input means is enabled in response to the absence of any data or command from the processor to the built-in keyboard, and data from the external input means is activated with the external input means enabled. And one of the commands is present, the data from the external input means Alternatively, a command is received and transmitted to the processor, and the external input means is invalidated in response to the absence of any data or command from the external input means, and one of the data and command from the built-in keyboard is transmitted. Is transmitted to the processor in response to the presence of a data or command from the embedded keyboard.

According to an eighth aspect of the present invention, in the data processing communication method according to the seventh aspect, the controller sends one of a command and data other than a resend request command for making a resend request for at least one of the data and the command. When it is received from the processor, the received command or data is directly transmitted to the external input means, and when one of the command and data other than the resend request command is received from the external input means, the received command or data is directly transmitted. It is characterized in that it is transmitted to the processor.

According to a ninth aspect of the present invention, in the data processing communication method according to the seventh aspect, when the controller transmits a command from the processor to the external input means, the built-in keyboard and the external input are provided. It is characterized by interpreting the received keyboard command and executing it for the built-in keyboard by utilizing the idle time due to the communication time difference with the means.

According to a tenth aspect of the invention, in the data processing communication method according to the seventh aspect, the controller is
When the processor sends a resend request command for requesting resend of at least one of data and command, one of the data and the command sent to the processor last time is resent, and the external input means sends a resend request command. In this case, one of the data and the command sent to the external input means last time is retransmitted.

According to an eleventh aspect of the present invention, in the data processing communication method according to the seventh aspect, the controller is
When the acquisition of one of the data and the command from the processor is unsuccessful, a resend request command for sending a resend request of at least one of the data and the command is sent to the processor, and the data and the command from the external input unit are sent. A feature is that when one of them is not surely received, a resend request command is sent to the external input means.

[0019]

According to the controller of the invention described in claim 1, the validating means for validating the external input means in response to the absence of any data or command from the processor to the built-in keyboard, and the external input means are validated. The first data transmission means for receiving the data or command from the external input means and transmitting the data or command to the processor in response to the presence of one of the data and the command from the external input means, and the external input means is enabled. In this state, there is one of the invalidating means for invalidating the external input means in response to the absence of any data or command from the external input means and one of the data and command from the built-in keyboard. A second data transmission means responsive to sending data or commands from the embedded keyboard to the processor; Since the are alternatively activated as required external input means and embedded keyboard.

According to the second aspect of the present invention, since the external output means can be detachably connected to the controller in the housing by the connecting means, various external input means such as an external keyboard and a bar code reader can be connected. can do.

According to the invention of claim 3, the first interface is a parallel interface, and the second interface is
Since the interface of is a serial interface, the communication of commands and data performed between the controller and the built-in keyboard is parallel communication, and the communication of commands and data performed between the controller and external input means is It becomes serial communication. For this reason,
When communication is performed based on the same command from the processor, a time difference occurs between the two, and the controller can execute processing for the built-in keyboard by utilizing the idle time due to this communication time difference. Therefore, the built-in keyboard and the external input means can be activated (activated) at the same time.

According to the fourth aspect of the present invention, when the external input means is an external keyboard, both the built-in keyboard and the external keyboard are connected to the controller, and the both are selectively operated as needed. Can be used.

When the external input means is a bar code reader, it is possible to read the bar code indicating the product number of the product with the bar code reader and input the quantity of the product with the keys of the built-in keyboard. Become.

If the external input means is a card,
By reading the ID card with the card reader, for example, it is possible to input information without troublesome key operation, and it is also possible to input the key when necessary.

According to the fifth aspect of the present invention, when the controller fails to receive the command or data from the external input means, the command or data stored in the buffer is restored again by sending the resend request command. As it is sent from the external input means, the controller can reliably receive the command or data.

According to the invention described in claim 6, since the command transmitted to the processor is a command other than the retransmission request command for requesting the retransmission of at least one of the data and the command, the retransmission request command is treated specially. You can

According to the invention described in claim 7, the controller activates the external input means in response to the absence of any command or data from the processor to the embedded keyboard, and the external input means is activated. In the state, in response to the presence of one of the data and the command from the external input means, the data or the command is received from the external input means and transmitted to the processor, and both the data and the command from the external input means are present. The external input means and the built-in keyboard are disabled in response to the failure to do so, and the data or command from the built-in keyboard is transmitted to the processor in response to the presence of one of the data and the command from the built-in keyboard. Are activated alternatively as required.

According to the present invention, the controller transmits the command or data other than the resend request command received from the processor to the external input means as it is,
Since the command or data other than the resend request command received from the external input means is transmitted to the processor as it is, a mixture of the case where the transmission is not successful when the command is transmitted from the controller to the processor or the external input means and the other case Is prevented.

According to the ninth aspect of the invention, when the controller transmits the command or data from the processor to the external input means, the idle time due to the communication time difference between the built-in keyboard and the external input means is used, By interpreting the received keyboard command and executing the processing for the built-in keyboard, it is possible to activate (activate) the built-in keyboard and the external input means at the same time.

According to the tenth aspect of the invention, when the processor sends the resend request command, the controller resends the command or data sent to the processor last time, and the external input means sends the resend request command. In this case, since the command or data sent to the external input means last time is retransmitted, the command or data can be reliably transmitted from the controller to the processor or the external input means.

According to the eleventh aspect of the invention, the controller sends a resend request command to the processor when one of the data and the command from the processor is unsuccessfully fetched, and the data and the data from the external input means are sent. If one of the commands cannot be reliably received, the retransmission request command is sent to the external input means, so that the command can be reliably received by the controller.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.
It will be described based on.

FIG. 1 shows a computer device 10 as a data processing device according to the first embodiment.

This computer device 10 is a so-called sub-computer.
It is a notebook (small notebook) type small computer, and includes a main body 12 having a rectangular shape in plan view, and a lid 14 attached to one end in the width direction of the main body via a hinge 11 (not shown) so that the main body 12 can be turned up and down. have.

The main body 12 is provided with a thin casing 16 having a rectangular shape in plan view and an embedded keyboard 18 integrally incorporated in the casing 16. In addition, the housing 16
A central processing unit (C
PU), a memory composed of a RAM and a ROM, a keyboard controller, and the like.

An external keyboard 20 as an external input means is detachably connected to the main body 12 via a connector 13 as a connecting means provided on the back surface thereof.

The lid portion 14 is provided with a display portion 20 composed of a liquid crystal display. FIG. 2 is a block diagram showing the configuration of the main part of the first embodiment.

In FIG. 2, a memory 26 and a keyboard controller 28 as a controller are connected to the CPU 22 via a system bus 24.

Of these, the keyboard controller 28
Is a control unit 30 connected to the CPU 22 via the system bus 24, a first interface 32, a second interface 34, a host buffer 36 connected to the control unit 30 via a bus line, and And a buffer 38 for external input means. The keyboard controller 28 is actually composed of a so-called one-chip microcomputer.

The built-in keyboard 18 is connected to the first interface 32 via a bus line, and the first interface 32 is provided to match the built-in keyboard and the control unit 30 with each other. It is composed of a parallel interface that sends and receives commands. Therefore, the control unit 30 can accept the scan code generated by the built-in keyboard 18 in a short time.

The external keyboard 20 is connected to the second interface 34, and the second interface 3 is connected.
Reference numeral 4 is provided to match the external keyboard 20 and the control unit 30, and is composed of a serial interface. Therefore, the control unit 30 transmits a command to the external keyboard 20 and, conversely, the external keyboard 20 transmits a command to the control unit 30 by serial communication.

The control unit 30 includes the built-in keyboard 3
2. It has a function of mediating communication of commands or data between the external keyboard 20 and the CPU 22, and other functions. The main control operation of the control unit 30 will be described later.

In the host buffer 36, the control unit 30 uses C
When a command or data sent from the built-in keyboard 18 or the external keyboard 20 is sent to the PU 22, the command or data is temporarily stored.

The external input means buffer 38 is for temporarily storing the command or data when the control section sends the command or data sent from the CPU to the bar code reader. .

The external keyboard 20 is provided with a buffer 39 for temporarily storing a command or data to be sent, and the external keyboard 20 is provided with the control unit 3.
It has a function of resending the data or command stored in the buffer 39 when it receives a “RESEND” command as a resend request command requesting resending of the data or command from 0.

Next, the main control algorithm of the control unit 30 will be described with reference to the flowcharts shown in FIGS. Note that, in FIGS. 3 and 4, for convenience of illustration, the command is simply referred to as “command”. However, in reality, this “command” is a command or data including a resend request command “RESEND”, or a resend request. Command "RES
It means a command or data excluding "END".

The control algorithm corresponding to this flowchart is stored in the ROM (not shown) in the control unit 30.

First, in step 100, the external keyboard 20 as external input means is invalidated as an initial setting. Here, invalidating means making the external keyboard 20 incommunicable, that is, deactivating the external keyboard 20. As a result, no data is input even if the external keyboard 20 is operated.

At the next step 102, it is judged whether or not there is data from the CPU 22 or a command including the resend request command "RESEND". If neither the data nor the command is input from the CPU 22, the external keyboard 20 is validated and the next step 1
Move to 06. Here, "validating" means making the external keyboard 20 communicable, that is, activating the external keyboard 20.

In step 106, the external keyboard 20
It is determined whether there is a command including data or a resend request command “RESEND” from the external keyboard 2
If there is no command or data from 0,
After proceeding to step 108 and disabling the external keyboard 20, proceeding to step 110, the built-in keyboard 1
It is determined whether there is a command or data from 8.
Here, if neither command nor data from the built-in keyboard 18 exists, the process returns to step 102,
If there is any command or data from the built-in keyboard 18, the process proceeds to the next step 112, and this command or data is temporarily stored in the host buffer 36. In the next step 114, the command or data is extracted and output to the CPU 22, and the process returns to step 102.

As a result, the built-in keyboard 18 can be activated as necessary even when the external keyboard 20 is connected.

On the other hand, if the determination in step 106 is affirmative, the routine proceeds to step 116, where after the command or data from the external keyboard 20 is received, the routine proceeds to the next step 118. In this step 118, it is judged whether or not the command or data from the external keyboard 20 has been surely received, and if it cannot be surely received (when there is an error in the command or data), the process proceeds to step 124. Resend request command "RES
After once storing the "END" command in the external input means buffer 38, the process proceeds to step 126. When the determination in step 118 is affirmative, the process proceeds to the next step 119, and it is determined whether or not a command is received. If the determination in step 119 is negative, that is, if the data is received, the process proceeds to step 132, but if the determination is affirmative, the process proceeds to the next step 120 and the received command is the resend request command “RESEND”. It is determined whether the received command is “RESEND”.
If it is, the CPU 22 of the previous time is determined in step 1122.
The command or data sent from the external keyboard 20 to the external keyboard 20 is stored in the external input means buffer 38, and then the process proceeds to step 126.

In step 126, the external keyboard 20
Notify the signal transmission to. Here, the notification of this signal transmission is the keyboard controller-external keyboard 20.
This is done by setting the clock line, which is connected between them, to "1" (enable) and the data line to "0". This is to prepare for sending the data.

In the next step 128, the external keyboard 2
Validate 0 and proceed to the next step 130. In step 130, the command or data stored in the external input means buffer 38 in step 122 or step 124 is sent to the external keyboard 20, and then the external keyboard 20 is invalidated in the next step 136, and the process returns to step 102. .

On the other hand, if the command received in step 116 is not "RESEND" which is the resend request command, the determination in step 120 is denied and the routine proceeds to step 132.

In step 132, the host buffer 3
A command or data from the external keyboard 20 is stored in 6. In the next step 134, the host buffer 3
After outputting the command or data stored in 6 to the CPU 22, the process returns to step 102.

As a result, when there is a command or data from the external keyboard 20 and the command or data cannot be reliably received, the command "RESEND", which is a resend request command, is sent to the external keyboard 20 to ensure the reception. If it is the resend request command “RESEND”, the command or data sent to the external keyboard 20 last time is resent, and the command is the resend request command “RESE”.
If the command is other than "ND", the "RES
Commands other than "END" are sent to the CPU 22. In the case of data, the data is sent to the CPU 22 in the same way as commands other than "RESEND".

On the other hand, if a command or data including the resend request command "RESEND" is input from the CPU 22 and the determination in step 102 is positive, the process proceeds to step 204 and the command or data from the CPU 22 is entered. Take in. In the next step 206, it is determined whether the capture is successful (whether there is an error in the command or data).

Here, the commands other than the resend request command "RESEND" from the CPU 22 include, for example, selection of the scan code table, setting of the type waiting weight, setting of the hold time for recognizing that a key is pressed, and the like. is there. Of these, the selection of the scan code table is a table that defines which character code is to be output corresponding to the key on the keyboard, and normally on the keyboard, one key corresponds to multiple characters, There are three tables on one keyboard, which can be selected by the function keys.

The setting of the type wait weight means the setting of how many characters of data are output per unit time when the key is continuously pressed.

The setting of the hold time for recognizing that the key has been pressed serves as a standard for invalidating the key when the key is pressed only for a moment and outputting data when the key is pressed for a certain period of time or longer. The setting of a certain fixed time.

If the acquisition of the command or data in step 206 is unsuccessful, step 2
12, the resend request command "RESEN"
Once the command “D” is stored in the host buffer 36,
Go to step 214. On the other hand, when the determination in step 206 is affirmative, the process proceeds to step 207 and it is determined whether or not a command is received. If the determination in step 207 is negative, that is, if the data is received, the process proceeds to step 216. If the determination is affirmative, the process proceeds to step 208, and the received command is the resend request command “RESEND”. It is determined whether or not If the determination in step 208 is affirmative, the process proceeds to step 210, the command or data previously output to the CPU 22 by the signal from the external keyboard 20 is temporarily stored in the host buffer 36, and the process proceeds to step 214. To do.

In step 214, the command or data stored in the host buffer 36 in step 210 or step 212 is output to the CPU 22, and then the process returns to step 102.

As a result, when there is data or a command from the CPU 22 and the acquisition of the command is unsuccessful, the resend request command "RESEN" is issued.
When the “D” command is output to the CPU 22 and the data or command from the CPU 22 is successfully fetched,
If the command is the resend request command “RESEND”, the command or data previously sent to the CPU 22 is re-output.

On the other hand, if the determination in step 208 is negative, the process proceeds to step 216.

In step 216, the external keyboard 2
0 is notified of signal transmission. In the next step 218, the external keyboard 20 is validated, and the process proceeds to the next step 220. In this step 220, the data from the CPU 22 fetched in the above step 204 or a command other than the resend request command "RESEND" is temporarily stored in the external input means buffer 38, and in the next step 224 this external input means After the data stored in the buffer 38 or a command other than the resend request command "RESEND" is output to the external keyboard 20, the process proceeds to the next step 226. In step 226, the external keyboard 20 is invalidated, and the process returns to step 102.

Here, steps 216 to 22
4 after performing the processing of step 4, that is, during the serial communication from the keyboard controller 28 to the external keyboard 20 in parallel with the serial communication, the above step 220
Then, internal processing for the built-in keyboard corresponding to the same command as the command from the CPU 22 output to the external keyboard 20 is performed (step 226). here,
The same command output from the CPU 22 to the built-in keyboard and the external keyboard 20 is the status of the two keyboards (the scan code table being used,
This is for setting the same type waiting time, hold time, etc.). Since the first interface 32 is a parallel interface, the keyboard controller 28 can communicate in parallel with the built-in keyboard 18, but the second interface 34 is a serial interface, so that the keyboard controller 28 can communicate with the external keyboard 20. Communication takes place in serial, which takes time. Therefore, the internal processing for the built-in keyboard 18 is performed as described above by utilizing the free time generated by the communication time difference between the two.

At the next step 228, the process for the built-in keyboard 18 is waited for, and when the process is completed, the process returns to step 102.

As a result, there is a command from the CPU 22, and this command is the resend request command "RESEN".
If it is “D”, the command or data sent to the CPU 22 last time is re-output, and this command is “RSEN
If it is not “D”, the command is directly transferred to the external keyboard 20, and at the same time, the internal processing for the embedded keyboard 18 can be performed by utilizing the idle time caused by the communication time difference between the embedded keyboard 18 and the external keyboard 20. And both can be enabled at the same time. Note that when data is input from the CPU, the same processing as in the case of commands other than "RSEND" is performed.

As described above, according to this embodiment,
The built-in keyboard 18 and the external keyboard 20 can be selectively or simultaneously enabled as needed.

Next, a second embodiment of the present invention will be described with reference to FIGS. The second embodiment is characterized in that a bar code reader 40 is provided as an external input means instead of the external keyboard 20 in the first embodiment described above. The other structure is the same as that of the first embodiment.

According to the second embodiment, as shown in FIG. 6, the bar code 44 attached to the article 42 can be read by the bar code reader 40, and the quantity can be entered with the keys of the built-in keyboard 18. Becomes

Therefore, it becomes possible to use a small computer such as a palm-top type computer or a sub-notebook type computer which is easy to operate for inventory management which has been difficult in the past.

The external input means is a bar code reader for reading the bar code recorded on the external keyboard, the bar code attached to the product, the business card, etc., as exemplified in the first and second embodiments. It is not limited, for example,
Scanner (card reader) for reading information recorded in the magnetic recording unit of ID cards and credit cards
Other external input means may be used.

[0075]

As described above, according to the present invention,
The built-in keyboard and the external input means can be selectively or simultaneously enabled as required, so that when the external input means is a bar code reader, the product number (bar code) of the product can be read. It is possible to perform key input in a quantity and to use a small computer with a built-in keyboard for warehouse management and the like, which is an excellent effect that has never been achieved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a main part of the first embodiment.

FIG. 3 is a part of a flowchart showing a main control algorithm of the keyboard controller of FIG.

4 is the remainder of the flowchart showing the main control algorithm of the keyboard controller of FIG.

FIG. 5 is a perspective view showing a second embodiment.

FIG. 6 is an explanatory diagram visually showing reading of a product number by a barcode reader and quantity input by key input.

[Explanation of symbols]

 10 Computer (Data Processing Device) 18 Embedded Keyboard 20 External Keyboard (External Input Means) 22 CPU (Processor) 24 System Bus 28 Keyboard Controller (Controller) 32 First Interface 34 Second Interface 39 Buffer 40 Bar Code・ Reader (external input means)

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Claims (11)

(57) [Claims] 1. A processor for processing data, which is connected to the processor via a system bus and to a built-in keyboard via a first interface, and via an external input means and a second interface. A data processing device comprising: a controller connected thereto, wherein the controller validates the external input means in response to the absence of any data or command from the processor to the embedded keyboard. And the external input means is enabled, and in response to the presence of one of the data and the command from the external input means, receives the data or command from the external input means and transmits it to the processor. First data transmission means for enabling the external input means to be activated In, and disabling means for disabling said external input means in response to any of the data and commands from said external input means is not present, in a state in which the external input means is disabled, the embedded keyboard Second data transmission means for transmitting data or a command from the built-in keyboard to the processor in response to the presence of one of the data and the command from the data processing device. Wherein with the built-keyboard, a housing said processor and said controller is incorporated therein, and said external input means the housing of the freely connectable connection means removably to the controller, the The data processing apparatus according to claim 1, further comprising: 3. The data processing apparatus according to claim 1, wherein the first interface is a parallel interface and the second interface is a serial interface. 4. The external input means is an external keyboard,
The data processing apparatus according to claim 1, wherein the data processing apparatus is one of a bar code reader and a card reader. 5. The external input means has a buffer for temporarily storing the data to be sent out, and retransmits the data stored in the buffer in response to a resend request command from the keyboard controller. The data processing device according to claim 1. 6. The data processing apparatus according to claim 1, wherein the command transmitted to the processor is a command other than a resend request command for requesting resend of at least one of data and a command. 7. A processor for processing data, a processor connected to the processor via a system bus and a built-in keyboard via a first interface, and an external input means via a second interface. a data processing device including a controller and a is a communication method of data processing between the external input means connected to said controller via said second interface, said controller, from said processor Activating the external input means in response to the absence of any data or commands for the embedded keyboard,
With the external input means enabled, in response to the presence of one of the data and command from the external input means, the data or command is received from the external input means and transmitted to the processor, and in response to any of the data and commands from the external input means are not present to invalidate said external input means, said outer
A data processing communication method comprising transmitting data and a command from the built-in keyboard to the processor in a state in which a partial input unit is disabled . 8. When the controller receives one of a command and data other than a resend request command for requesting resend of at least one of data and a command from the processor, the received command or data is sent to the external input means. If one of the commands and data other than the resend request command is transferred from the external input means, the received command or data is directly transferred.
8. The data processing communication method according to claim 7, further comprising transmitting the data to the processor. 9. The keyboard received by the controller, when transmitting a command from the processor to the external input means, by utilizing a free time due to a communication time difference between the built-in keyboard and the external input means.
8. The data processing communication method according to claim 7, wherein the command is interpreted and executed for an embedded keyboard. 10. The controller retransmits one of the data and the command previously sent to the processor when the processor sends a resend request command for sending a resend request for at least one of data and a command, and the external 8. The data processing communication method according to claim 7, wherein when the input means sends a resend request command, one of the data and the command sent to the external input means last time is resent. 11. The controller sends a resend request command for requesting resending of at least one of data and command to the processor when the acquisition of one of data and command from the processor is unsuccessful, 8. The retransmission request command is sent to the external input means when one of the data and the command from the external input means cannot be reliably received.
Communication method for data processing described.