JPS602686B2 - Repeat control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a repeat control method used directly in an information processing bag having a data input device constituted by a matrix scan type keyboard.

Conventionally, in an information processing apparatus, if all repeat control of a keyboard serving as a data input section is handled by hardware, the hardware base will increase significantly, resulting in an expensive and complicated configuration.

In addition, the conventional repeat function of this type of keyboard can only repeat one character at a time, and therefore requires many operations and a lot of time during performance tests, for example. The present invention has been made in view of the above circumstances, and its object is to provide a repeat control system that can perform repeat control using a matrix scan type keyboard with an inexpensive and simple configuration.

Another object of the present invention is to provide a repeat control method that can easily implement a repeat function for a plurality of key input data.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the main components of the control system circuit of a matrix scan type keyboard. In the figure, R
L to RL are output signals of data keys provided on the keyboard, that is, signals after scanning, RPT, SHFT,
Similarly, CTL is a level signal associated with the key input operation of each level key (repeat key, shift key, control key) provided on the keyboard, and KRD, KRD is a discussion of key input data output from the processing unit (CPU). signal (hereinafter simply referred to as read signal) and its inverted signal, S
Co to SC7 are scan signals sent to the keyboard. A keyboard controller 11 receives each signal from the keyboard, obtains key input data, and performs key input data control including scanning control of the keyboard; 12 controls the scan signal SCo based on the signals from the keyboard controller 11; A scan decoder 13 receives scanned signals RLo to RL output from the keyboard and detects that a data key has been input.

1 and 4 are inverters that invert the level signal RPT;
15 is an AND gate that receives the inverted signal RPT of the inverter 14 and the data key detection signal obtained from the OR gate 13; 16 is the trailing edge of the read signal KRD after being set by the condition fulfillment signal of the AND gate 16; In other words, reset control is performed upon separation of KRD.

A D-type flip-flop (hereinafter referred to as D-F/F) 17 serving as a repeat flag receives the set output (KRP) of this DF/F 16 and the read signal KRD,
This is an AND gate that obtains a signal for sending key input data onto the common bus when a condition is met. FIG. 2 shows an example of the configuration of a matrix scan type keyboard.

... is a data key on the matrix. KR,Ks
, Kc indicate level keys, KR is a repeat (REPEAT) key, and KS is a shift (SHIFT) key.
) key and Xc are control keys. FIG. 3 shows an example of the configuration of a speed buffer provided in a memory buffer area of a processing unit (CPU).

FIGS. 4 and 5 are flowcharts relating to repeating the interrupt routine.

The effect will be explained here.

The keyboard controller 11 constantly scans the keyboard, and the scan decoder 2 sequentially sends scan signals SCo, SC. ...SC7, SCo
...is output. When a certain data key on the keyboard (here K. is the key indicated by ■) is operated, that key K is pressed. The matrix line group corresponding to (3) is turned on, so in this example, when the scan signal SC3 becomes "0", the signal RL2 output from the keyboard becomes "0", and this signal "0" is transmitted to the keyboard controller 11. sent to. The keyboard controller 11 uses this RL2=
When a signal of “0” is received, the level signals (SIFT, CTL
) to create, for example, 8-bit key input data. Furthermore, it issues a keyboard interrupt request and contacts the processing unit (CPU). At this time, for example, the keyboard controller 11 is
If the key rollover or two-key lock mode was used. Since an interrupt request is only generated upon detection of a key action, repeat processing cannot be performed as is. So, data key K. In order to detect that the signal is being operated, a pulse-like signal of the signal R is repeatedly scanned from the OR gate 13. This signal is inverted via the inverter 14 and the beat key K
The level signal RPT from R is input to the AND gate 15, and the DF/F 16 is set by the condition fulfillment signal at this time.

Therefore, D-F/F16 is one or more data keys K. Tori Beat Key K. If both are operated, a repeated set pulse is input to maintain the set state. This D
The F/F 16 sends its set output KRP to the AND gate 17, and uses the read signal KRD to supply the key input data to the common bus so that it can be read by the processing unit (CPU), and also clocks the KRD signal. It is set as an input, and the D input is always set to "0" so that it is reset by the trailing edge before the read signal rain, that is, the front line of KRD. At this time, the data key K remains even after the key input data is read by the read signal KRD. If the IJ beat key KR and IJ beat key KR are operated continuously, the D-F/F16 will be set again, but the above key K will be set again. , KR are not operated, the condition of AND gate 15 will not be satisfied and will not be set, and therefore the repeat flag will disappear. The processing process (CPU) is
After receiving a keyboard interrupt request from the keyboard controller 11 and processing key input data, the repeat flag (D-F/F16) is discussed, and if the repeat flag is set, the data in the repeat buffer is used. The repeat operation is performed by performing processing equivalent to keyboard input processing (see FIG. 5). In reading the above repeat flag, repeat flag (D-F/F1
Since the IJ setting in 6) is performed automatically, firmware control becomes simple.

Next, we will discuss the effect of using multiple repeat buffers in the third section.
This will be explained with reference to FIGS. 5 to 5.

Create multiple repeat buffers, check the repeat flag in the keyboard input interrupt process, and if it is set, store data in the repeat buffer one after another. Data key K while operating repeat key KR. The interval timer routine stores each key input data in the repeat buffer as long as the repeat flag continues to be set. By performing repeat service in sequence, it is possible to repeat multiple keys. At this time, each repeat buffer is cleared entirely by detecting the reset of the repeat flag in the interval timer routine. Fig. 3 shows an example where data of 3 characters is stored in the repeat buffer, and the repeat operation by the interval timer is the repeat data 1 → 2 → 3 → 1 →...
It is repeated as follows. Each of the flowcharts shown in FIGS. 4 and 5 shows control related to repeating the respective interrupt routines described above. In each of these flowcharts, if multiple buffers for key input processing are prepared, all data stored in the repeat buffer is input to the buffer for key input processing in one timer routine. When the processing buffer becomes full, processing to interrupt the processing is performed), and by activating the key input processing, the repeat speed can be improved. In this control, normally only one data key is operated at the same time, and only one character is stored in the repeat buffer, so unless the operator consciously operates multiple data keys at the same time, such operations will not occur. Therefore, there is no problem in normal operation. By using the repeat control method as detailed above, the repeat function can be realized with a simple and inexpensive hardware configuration, and the repeat can be canceled using simple hardware without using firmware control.

It also enables advanced functionality of repeat buffers. Furthermore, since multiple keys can be repeated at a high speed that would be difficult to perform manually, it is possible to easily perform limit tests for performance evaluation, for example.

[Brief explanation of drawings]

The figure is for explaining one embodiment of this invention.
The figure is a block diagram showing the main part configuration of the control system circuit in a matrix scan type keypad. Figure 2 is a diagram showing an example of the key matrix configuration in a matrix scan type keypad. Figure 3 is the configuration of the repeat buffer. The illustrative figures, FIGS. 4 and 5, are flowcharts each showing an interrupt routine regarding repeat. 11... Keyboard controller, 12... Scan decoder, 13... OR gate, 14... Inverter, 1
5.17...AND gate, 16...D type flip-flop (D-F/F), K. ...Data key, KR...
...Repeat key. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. A scan signal is sent out sequentially to a plurality of scan lines, and by operating a data key arranged on each of the scan lines, the scan signal is outputted to a return line that is electrically connected to the scan line. In a data input device equipped with a matrix scan type keyboard that detects key operations, by taking the logical sum of the signals of each return line, it is possible to synchronize with the scan operation while any data key is operated. a key input detection circuit that outputs a key input detection signal; an AND output circuit of the detection signal and a level signal associated with a repeat key operation of the keyboard; and when the data key and the repeat key are operated at the same time. and a repeat flag that is set by a signal obtained from the AND output circuit and reset by a key input data read signal indicating that the CPU has finished reading key input data by operating the data key. However, if the operation of the data key and the repeat key continues after the repeat flag is reset by the key input data read signal, the repeat flag is reset by the output of the AND output circuit, A repeat control method characterized by having a configuration that notifies a CPU of a repeat state. 2. When a repeat key and multiple data keys are operated together, the input interrupt processing routine performs key input processing in the order in which the keys were operated, and sends the processed data to the repeat buffer. The content of the repeat flag is read each time a timer interrupt occurs, and when the repeat flag is set, the data saved in the repeat buffer is sequentially processed as key input data. repeat control method. 3. The repeat control method according to claim 2, wherein all data saved in the repeat buffer is processed as key input data by one timer interrupt.