STLED325 datasheet(46/62 Pages) STMICROELECTRONICS

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Commands

STLED325

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Doc ID 17576 Rev 1

7.2

Data setting command

This command sets the data-write and data-read modes.

Description:

Bits b7-b6 = 01 is decoded as a data setting command. The subsequent bits are

decoded as follows:

b5 b4 = 00: data write command (see bits b1-b0)

b5 b4 = 01: data write 1 command (see bits b1-b0)

b5 b4 = 10: data read 1 command (see bits b1-b0)

b5 b4 = 11: data read 3 command (see bits b1-b0)

b3: clear the guard timer (no change in guard time)

b2: when set to a 1, the guard timer is forced to enable and starts the count again.

While in normal mode, the count starts

Note 1: The following byte with MSB7 and MSB6 corresponds to GPIO[1:0] for data to be

written into GPIO1 and GPIO0 when they are configured as outputs.

Figure 16.

Data write command (b7 b6) for GPIO

When b7 is 1, it drives logic 1 on GPIO1 output and when it is 0, it drives logic 0 on GPIO1

output.

When b6 is 1, it drives logic 1 on GPIO0 output and when it is 0, it drives logic 0 on GPIO0

output.

MSB

LSB

Table 26.

Data write command. b5 b4: 00

b1-b0

Write memory (display or RTC) – Address range: 0x00-0x0F. Start

address pointer location is 0x00.

Write memory (display). Address range: 0x10-0x13. Start ad-dress

pointer location is 0x10.

Write memory (discrete LED). Address: 0x14.

Write data into GPIOs if they are configured as outputs (see note 1)

MSB7

RSVD

MSB6

RSVD

MSB

LSB

GPIO1

GPIO0

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