STFPC320 查看數據表（PDF） - STMicroelectronics

零件编号

产品描述 (功能)

生产厂家

STFPC320

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

STMicroelectronics 

LED port

9

LED port

STFPC320

Data is written to the LED port by a write command, starting from the most significant bit of

the port. When a bit of this port is set to 0, the corresponding LED lights up; when the bit is

set to a 1, the LED turns off. The data of bits 5 through 8 are ignored. Upon first power-up,

all the LEDs are turned OFF.

Figure 19. LED byte format

MSB

LSB

- - - - b3 b2 b1 b0

LED1

LED2

LED3

LED4

Don’t Care

9.1

Writing to LED sequence

MSB

LSB

Data Setting Command

0

1

0

0

0

0

1

1

Data (will turn on all the 4 the LEDs)

MSB

LSB

Data Byte

X

X

X

X

0

0

0

0

For example, the LEDs can be connected to indicate ‘Power-On’, ‘Standby’, ‘Record’,

‘Function’ status on front panel. If the data bit corresponding to the LED is a ‘0’, the LED will

turn-on during normal operation and standby mode.

So as an example, to turn on the LED for standby indication, the processor must write ‘0’ to

the corresponding data bit before de-asserting the READY pin (i.e. before going into STBY).

This will continuously keep the STBY LED ‘ON’ during standby mode of operation.

44/78

Share Link: