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ML9090-01- Datasheet(PDF) 19 Page - OKI electronic componets

Part # ML9090-01-
Description  LCD Driver with Key Scanner and RAM
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Manufacturer  OKI [OKI electronic componets]
Direct Link  http://www.oki.com
Logo OKI - OKI electronic componets

ML9090-01- Datasheet(HTML) 19 Page - OKI electronic componets

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¡ Semiconductor
ML9090-01,-02
19/38
PEDL9090-02
2. Instructions (Data Registers)
• Key scan register (KR)
D7
D6
D5
D4
D3
D2
D1
D0
ST2
ST1
ST0
S4
S3
S2
S1
S0
(1) D7 to D5 ST2 to ST0 (Scan read counter)
When reading 25-bit key scan data, these bits indicate the number of times scan data has been
read. Every time key scan data is read, these bits (ST2 to ST0) are automatically incremented over
the range of “000” to “100”. After counting to “100”, this key scan data read counter is reset to
“000”.
If the RESET pin is pulled to a “L” level, these bits are reset to “0”.
(2) D4 to D0 S4 to S0 (Key scan read data bits)
These bits are read as 25-bit serial data that expresses the key switch status (1 = ON, 0 = OFF). Data
is divided into 5 groups and read. (For the read order, refer to the description below.) The read
count is indicated by bits ST2 to ST0. S4 to S0 key scan data corresponds to each SWN0 of the key
matrix shown in figure 1. The relation between the key scan data, key matrix signal and each
SWN0 of the key matrix is shown below.
If the RESET pin is pulled to a “L” level, these bits are reset to “0”.
ST2
0
ST1
0
ST0
0
S4
SW04
S3
SW03
S2
SW02
S1
SW01
S0
SW00
R0
0
0
1
SW14
SW13
SW12
SW11
SW10
R1
0
1
0
SW24
SW23
SW22
SW21
SW20
R2
0
1
1
SW34
SW33
SW32
SW31
SW30
R3
1
0
0
SW44
SW43
SW42
SW41
SW40
R4


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