lc75700t Sanyo Semiconductor Corporation, lc75700t Datasheet - Page 9

• Manufacturer Part Number: lc75700t
• Description: Key Scan Ic
• Manufacturer: Sanyo Semiconductor Corporation

Serial Data Output
1. When CL is stopped at the low level
2. When CL is stopped at the high level
Note: If a key data read operation is executed when DO is high, the read key data (KD1 to KD30) will be invalid.
Output Data
1.KD1 to KD30: Key data
When a key matrix of up to 30 keys is formed from the KS1 to KS6 key scan output pins and the KI1 to KI5 key scan
input pins and one of those key is pressed, the key output data corresponding to that key will be set to 1. The table
shows the relationship between those pins and the key data bits.
When the KS4/P4 to KS6/P2 output pins are set to function as the general-purpose output ports with the control data
“KP1 and KP2”, and a key matrix of up to 15 keys is formed from the KS1 to KS3 output pins and the KI1 to KI5 input
pins, the KD16 to KD30 key data bits will be set to 0.
KS1
KS2
KS3
KS4
KS5
KS6
CE
CL
DI
DO
CE
CL
DI
DO
• CCB address: 63H
• KD1 to KD30: Key data
KD11
KD16
KD21
KD26
KD1
KD6
KI1
B0
B0
1
1
B1
B1
1
1
KD12
KD17
KD22
KD27
KD2
KD7
KI2
B2
B2
0
0
CCB address
CCB address
B3
B3
0
KD13
KD18
KD23
KD28
0
KD3
KD8
KI3
A0
A0
0
0
A1
A1
KD14
KD19
KD24
KD29
1
KD4
KD9
1
KI4
A2
A2
1
1
KD10
KD15
KD20
KD25
KD30
A3
KD5
KI5
0
A3
0
X
KD1
X
LC75700T
KD2
KD1
KD3
KD2
KD4
KD3
Output data
Output data
KD26
KD26
KD27
KD27
KD28 KD29
KD28 KD29
KD30
KD30
X : don’t care
X : don’t care
X
X
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X