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 

STFPC320

8.1

Key read sequence

Key matrix

MSB

LSB

Data Setting Command

0

1

1

0

0

0

0

0

MSB

LSB

Key Data Byte 1

b7

b6

b5

b4

b3

b2

b1

b0

MSB

LSB

Key Data Byte 2

b7

b6

b5

b4

b3

b2

b1

b0

MSB

LSB

Key Data Byte 3

b7

b6

b5

b4

b3

b2

b1

b0

Description:

For example when the key corresponding to the KEY1/KS1 is pressed, the bit b0 of

Byte 3 will be set. This is decoded as the key value connected to KEY1/KS1 which

could be “PLAY” (for example). When the processor decodes the key value

corresponding to the “PLAY” key, it takes the necessary action (e.g. play the disc).

Note:

Upon a key-press, the IRQ_N/SQW pin will be asserted. The interrupt flag should be read to

know the source of interrupt. The interrupt flag is read by sending the 0x63 command. As

soon as the interrupt buffer is read, the IRQ_N/SQW pin will be de-asserted.

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