JPS5922131A - Key inputting method - Google Patents

Abstract

PURPOSE:To decrease the number of input terminals to an equipment controller, by converting key operation information into a key code through a controller dedicated to a key matrix, and outputting it to the equipment controller for a specific time. CONSTITUTION:The key controller 4 which uses a microcomputer converts 16 kinds of key information into four-bit parallel codes. A four-bit SW code is supplied to a deck controller 2 which controls a cassette deck as the equipment controller or tuner controller 3 which controls a tuner. The controller 4 reduces all the SW code to ''1'' when none of key switches SW of the key matrix 1 is pressed, but outputs an SW code corresponding to a key SW for the specific time when the key is pressed to reduce all the output terminals to ''1'' again. The SW code consists of four bits, so only four I/O terminals D0-D3 are used exclusively, reducing the number of input terminals.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a manual key input method to an equipment controller using a microcomputer.

When a microcomputer is used as a controller for controlling a device such as a cassette deck, the referee creates a key matrix and inputs information on various keys (switches).

Figure 1 shows a 4x4 key matrix 1 as an example.
As a result, key information is input to the device controller 2. If you try to input 16 types of key information without creating a key matrix as in this example, you will need 16 I/-O terminals, but as shown in the figure, there are 4 terminals for timing, and 4 terminals for time division. If four terminals are used for input, it can withstand 8 i/
You can input 16 types of key information using the child terminal. However, even if this is done, the 8 I/O terminals will be occupied by the key manually, so even if the controller 2 is used for other tasks, there may be a shortage of 17 terminals.

The present invention reduces the number of key input terminals to the device controller by providing a controller dedicated to the key matrix. The key manual method of the present invention is characterized in that a key controller receives various key operation information from a key matrix, converts it into a key code, and outputs the key code to a device controller for a predetermined period of time. This will be explained in detail below with reference to the illustrated embodiments.

FIG. 2 shows an embodiment of the present invention applied to an in-vehicle audio system, where the device controller is a deck controller 2 for controlling a cassette deck or a tuner controller 3 for controlling a tuner. 4 is a key controller using a microcomputer, which converts the 16 types of key information in the 4×4 key matrix 1 into parallel codes with 4 hints. This 4-bit SW code is supplied to controller 2.3, but in the following, deck controller 2.
I will explain about it. This controller 2 includes a decoder driver IC2 for display, a plunger PLN+ for inserting and ejecting a punctured cassette, and a plunger PLN2 for moving the head.
, a circuit IC3 that controls the reel motor MOT1, a circuit ICa that controls the capstan motor MOT2, a track switching relay RL, and the like. The reel rotation detection signal A is input to the deck controller 2.

In addition to sensor outputs such as B, S from the key controller 4
There is a W code. However, since this SW code is 4 bits, it occupies only four I/O terminals DO to D3.

FIG. 3 is a processing flow of the key controller 4. This controller 4 sets all SW codes to "1" if no key SW in the key matrix 1 is pressed, but when any key SW is pressed, the SW code corresponding to that key is set to "1" for a predetermined period of time (for example, 10m5). ＞ output only,
Set all output terminals to “1” again. Table 1 is a correspondence table between various keys and SW codes D o - D 3.

/ / Table 1 Detsuki controller 2 converts this 8w code to, for example, 5ms.
A keeper sofa (not shown) receives the data at intervals of 10m5, and its type is determined at intervals of 10m5.

FIG. 4 shows this time chart, t+, t2.・・・・・・
... is the key state capture timing, T1.1"2°.
. . . is the SW judgment timing. Since the timing at which the 8w code occurs is irregular, case 1.3
In some cases, the data is captured twice before the SW judgment timing, as in Cases 2 and 4, and in other cases, it is captured once, as in Cases 2 and 4.

In case 1, the 8w code taken into the key buffer at the second time t2 is determined by TI. In case 2, the first t
The SW code taken in step 4 is judged at T2. Case 3
Then, the 8w code taken in at the second time t4 is judged at T2. These are cases where there are no particular problems. However, in case 4, even if it is captured in the key buffer at the first time t3, it does not persist until the second time t and I, so the contents of the key buffer become all "1" at this time, and no keys are pressed at the timing of T4. It becomes equivalent to that.

Since this causes inconvenience, the processing of the two example deck controllers is performed as shown in FIG.

Figure 5(a) is a program that is executed every 1ms,
The count value of the counter TN that determines the import timing is 4.
or 9 (this interval is 5 ms), the process moves to key code input processing. However, if the key code (SW code) at that time is all "1", it will not be taken into the keeper 7.

The case of t4 in FIG. 4 corresponds to this. If the contents of the keeper sofa do not become all "L" at t4, the SW code taken in at t3 will last until T2, so there will be no problem in SW determination. In short, only when the SW code is valid, its contents are imported into the keeper sofa. Then, when the SW judgment process is completed, the contents of the keeper sofa are set to all “1”.
Keep it. Figure (b) shows this processing flow.
View the contents of the keypad sofa using "W Coco Judgment" - As described above, according to the present invention, the number of key input terminals used in a device controller such as a deck controller can be reduced, so the controller can be operated using the surplus terminals. I can do other jobs.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the conventional key manual method, Fig. 2 is a configuration diagram showing an embodiment of the present invention, Fig. 3 is a flowchart showing the processing of the key controller, and Fig. 4 is a key code input method of the device controller. FIG. 5 is a flowchart of the time chart of the input and determination processing. In the figure, ■ is a key matrix, 2 and 3 are device controllers, and 4 is a key controller. Applicant: Minoru Aoyagi, Patent Attorney, Fujitsu Ten Limited

Claims (1)

[Claims] A key manual method characterized in that a key controller receives various key operation information from a key matrix, converts it into a key code, and outputs the key code to a device controller for a predetermined period of time.