NJU6010 Просмотр технического описания (PDF) - Japan Radio Corporation

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NJU6010

24 keys input key-scan IC

Japan Radio Corporation  

Preliminary NJU6010

(2-1) Timing of Key-scan

The key-scan cycle is 512 x T[s] (T=1/fosc). The key data is detected by executing key-scan operation

of 2 times. This operation prevents the miss-recognition. (Refer to Fig. 2)

The key-scan operation is available by status of CSb=”H”. The key-scan operation is not executed at

status of CSb=”L”.

If the key data of 2-time is same, the NJU6010 recognizes that the key was pressed. Then, the DATA

terminal outputs “H” as request (REQ signal) to CPU after 1408 x T[s] maximum from key input. When the

DATA terminal outputs "H", the key data is kept in the internal register until CPU starts reading key data.

The key-scan is not executed until reading the key data finishes.

Key recognition

Key input

Key-scan start

Key input

Key data fixed

REQ signal output

fosc (Internal osc.)

Key-scan clock

(Internal signal)

S0

S1

S2

S3

DATA

128×T[s]

0

0

1

1

2

2

3

3

1st key-scan

2nd key-scan

512×T[s]

Maximum1408×T[s]

Fig. 2 Key-scan Timing

T=1/fosc

Ver.2009-08-20

-3-

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