参数资料
| 型号： | LC75700T-MPB-E |
| 厂商： | ON Semiconductor |
| 文件页数： | 6/16页 |
| 文件大小： | 0K |
| 描述： | IC KEY SCANNING LSI 20TSSOP |
| 标准包装： | 70 |
| 系列： | * |
Notes on the controller key data read techniques
1. Timer based key data acquisition
(1) Flowchart
(2) Timing chart
No. 7632-14/16
LC75700T
Key data read
processing
YES
NO
DO = "L"
CE = "L"
t3: Key scan execution time when the key data agreed for two key scans (615T (s))
t4: Key scan execution time when the key data did not agree for two key scans and
the key scan was executed again. (1230T(s))
t5: Key address (63H) transfer time
t6: Key data read time
T=
1
fosc
Controller
determination
(Key on)
Key data read request
Key data read
DO
DI
CE
Key on
Key
address
Key scan
Key input
t7
t3
t4
t6
t5
t3
t6
t5
Controller
determination
(Key on)
Controller
determination
(Key off)
Controller
determination
(Key on)
Controller
determination
(Key off)
(3) Explanation
In this technique, the controller uses a timer to determine key on/off states and read the key data. The controller must
check the DO state when CE is low every t7 period without fail. If DO is low, the controller recognizes that a key has
been pressed and executed the key data read operation.
The period t7 in this technique must satisfy the following condition.
t7 > t4 + t5 + t6
If a keydata read operation is executed when DO is high, the read key data (KD1 to KD30) will be invalid.
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