STLED524 datasheet(66/72 Pages) STMICROELECTRONICS

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STLED524

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DocID026217 Rev 1

6.2.3

Example 8 - how to enable PWM operation

Pattern has already been loaded into pattern 1 memory. In this example, we display pattern

1 with 50% of brightness which is achieved by enabling PWM.

First of all, we enable PWM operation and set PWM register to 128 by using data in

Table 65.

Byte 1 represents SPI command to write to the control register memory.

Byte 2 is the address where the writing starts.

Byte 3 contains data written to address 20h (display visual control register).

Byte 4 contains data written to address 21h (PWM control register).

As per example 6, we display pattern 1 by writing data to Table 66.

6.2.4

Example 8 - scroll operation

In this example we scroll with 2 blank rows and a speed set to 5. Pattern 2 replaces pattern

1. Both patterns, 1 and 2, have already been loaded into pattern memory according to

example 5. Scroll operation should start with pattern 1, so we display pattern 1 first by

writing data to Table 67.

Table 63. SPI data to display pattern 1

Byte index

Data

0x00

0x01

Table 64. SPI data to display pattern 2

Byte index

Data

0x00

0x01

0x02

Table 65. SPI data to enable PWM operation (PWM control register = 128)

Byte index

Data

0x00

0x20

0x02

0x80

Table 66. SPI data to display in pattern 1

Byte index

Data

0x00

0x01

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