STFPC320 datasheet(44/78 Pages) STMICROELECTRONICS

44 / 78 page

LED port

STFPC320

44/78

LED port

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

9.1

Writing to LED sequence

Data (will turn on all the 4 the LEDs)

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.

MSB

LSB

LED1

LED2

Don’t Care

LED3

LED4

MSB

LSB

LED1

LED2

Don’t Care

LED3

LED4

MSB

LSB

Data Setting Command

000011

MSB

LSB

Data Byte

XXXX

0000

STFPC320 数据表(PDF) 44 Page - STMicroelectronics

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