STFPC320 STMicroelectronics, STFPC320 Datasheet - Page 39

• Manufacturer Part Number: STFPC320
• Description: Front Panel Controller/driver With Standby Power Management And Real-time Clock
• Manufacturer: STMicroelectronics

STFPC320
8
Key matrix
The key matrix is of 12 x 2 configuration, as shown below.
The data of each key is stored as illustrated below and is read by a read command, starting
from the most significant bit.
Figure 15. Key Matrix and Key-input data storage RAM
KEY
KEY
KEY
KEY
KEY
KEY
1
1
1
2
2
2
KEY
b0---------b1
Seg
Seg
Seg
1
1
5
9
..KEY
/KS
/KS
/KS
1
5
9
2
KEY
b2---------b3
Seg
Seg
Seg
10
1
2
6
..KEY
/KS
/KS
/KS
2
6
10
2
KEY
Seg
b4---------b5
Seg
Seg
11
1
3
7
..KEY
/KS
/KS
/KS
3
7
11
2
KEY
Seg
b6---------b7
Seg
Seg
12
1
4
8
..KEY
/KS
/KS
/KS
4
8
12
2
Reading last
Reading first
Key matrix
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