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參數(shù)資料
| 型號(hào)： | MSC1208 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | 23-bit x 2 Duplex Controller/Driver with Digital Dimming and Keyscan Function |
| 中文描述： | 23位× 2雙控制器/驅(qū)動(dòng)器，數(shù)字亮度和鍵盤掃描功能 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大小： | 111K |
| 代理商： | MSC1208 |
9/14
MSC1208
Semiconductor
FUNCTIONAL DESCRIPTION
Key Scan
In the case of the push-button switch, key scanning is started only when depression or release
of the key is detected for the purpose of minimizing noise caused by scanning signal. Then, after
completion of 1-cycle scanning, all the ROW outputs return to a "L" level.
The push-button switch input pins (COL4-COL7) are connected to a chattering absorption
circuit that absorbs chattering with the chattering time about 25ms (typ.), so input signals
shorter than 25ms are ignored. Because of this, key scanning is started about 25ms after key
input.
In the case of the rotary switch, key scanning is started only once when a transfer of the rotary
switch contact or pressing down or release of the push-button switch is detected. Key scanning
is continued if the rotary switch contact is in the open state after this one-time scanning. Then,
scanning stops when the rotary switch contact makes connection with any of the selective
contacts. After that, all "L" outputs return to a "L" level.
The rotary switch input pins (COL1-COL3) have an internal chattering absorption circuit that
absorbs chattering with the chattering time about 1ms (typ.), so input signals shorter than 1ms
are ignored. Because of this, key scanning is started about 1ms after a change in switch status.
The switch data is stored in the internal latch circuit, and then transferred to the output register
at the rising edge of the first pulse of DATA ENABLE.
The switch data consists of 16-push button switch data (S1-S16) and 2-rotary switch data (RS1
and RS2). The rotary switch data consists of 3 bits for contact-transfer count and 1-bit for
rotating direction. Since the maximum transfer count is "111" in binary, a transfer is counted up
to seven times. The rotating direction bit is "0" for the regular direction and "1" for the opposite
direction.
[Rotating direction]
Regular direction
Opposite direction : R13
R12
R11
R13 (See figure below)
: R11
R12
R13
R11
COL4
COL5
COL6
ROW1
ROW2
ROW3
ROW4
S1
S2
S3
S5
S6
S7
S9
S10
S11
S13
S14
S15
COL7
S4
S8
S12
S16
COL3
COL2
COL1
Figure 5. Key Matrix
ROW1
COL3
COL2
COL1
R11
R12
R13
Figure 6. Rotary Switch Section (RS1)
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