STLED325 datasheet(48/62 Pages) STMICROELECTRONICS

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Commands

STLED325

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Doc ID 17576 Rev 1

In fixed address mode, the address command has to be sent followed by the display data.

When next byte of data is to be written, address command has to be sent again before new

display data byte.

When the user wants to read the RTC data from the specified memory location of RTC, the

user must first set the address of the RTC location using “Address Setting Command” after

which send the “Read RTC Register” command.

If the address pointer was located in the display memory location and user issues a “Read

RTC Register” command without sending the “Address Setting Command”, the RTC data is

read from the address location of the previous value of the RTC address pointer.

Thus before reading the RTC register data, the user must set the proper address for RTC

using “Address Setting Command”.

Prior to writing data to the RTC registers, the address of the RTC must be set using the

Address Setting command. Else, if the address pointer happens to be pointing at the LED

display memory, then the data will be written to the address location of the previous value in

the RTC address pointer. This is vice-versa true for the LED display memory.

7.3

Configuration data

Up to a maximum of 5-bytes are sent from LSB to MSB as configuration data. The 29-bytes

represent the following configuration information:

On power application, the normal operation mode and address increment mode is set with

the default display memory address set to 0x10 (start of display memory address location).

Refer to the display memory section.

In the auto increment address mode, the address command is sent once followed by the

data bytes.

Alternatively, the data command can be sent followed by the data bytes. In this case, when

new display data is to be written, the last value of the address will be used and then

MSB (b7)

LSB (b0)

Byte1

Decoded/Raw

RC setting

RC Protocol setting

Guard timer setting

Byte 2

Interrupt

config for

GPIO1

Interrupt

config for

GPIO0

Interrupt

enable config

for GPIOs

GPIO1

configuration

(input or

output)

GPIO0

configuration

(input or

output)

Digit 5 discrete

LED config

7-segment LED display

configuration setting

Byte 3

Not used

For display

enable

For display dimming setting

Byte 4

Front Panel Hot Key Bank 1

Byte 5

Front Panel Hot Key Bank 2

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