STFPC320 データシートの表示（PDF） - STMicroelectronics

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STFPC320

Front panel controller/driver with standby power management and real-time clock

STMicroelectronics 

Key matrix

8

Key matrix

The key matrix is of 12 x 2 configuration, as shown below.

Figure 18. Key matrix and key-input data storage RAM

KEY1

KEY2

STFPC320

The data of each key is stored as illustrated below and is read by a read command, starting

from the most significant bit.

KEY1..KEY2

Seg1/KS1

Seg5/KS5

Seg9/KS9

b0---------b1

KEY1..KEY2

Seg2/KS2

Seg6/KS6

Seg10/KS10

b2---------b3

KEY1..KEY2

Seg3/KS3

Seg7/KS7

Seg11/KS11

b4---------b5

KEY1..KEY2

Seg4/KS4

Seg8/KS8

Seg12/KS12

b6---------b7

Reading last

Reading first

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