STLED524 datasheet(32/72 Pages) STMICROELECTRONICS

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STLED524

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DocID026217 Rev 1

4.7

Scrolling

The STLED524 has built-in function of 4-way scroll of the display content. The scroll speed

can be defined in 8 steps. Blank rows or columns can be added to patterns to improve

readability during scrolling and a wait loop with adjustable duration can be performed at the

end of scroll to let reader read the display content.

4.7.1

Scroll control registers

SCRSPD[5:0] scroll speed register fixes the speed according to which the content of the

display is scrolled.

Table 36 shows duration of one scroll step according to SCRSPD[5:0] value.

SCRSPD settings can be updated only when scroll is disabled.

Table 35. Scroll control register 1

Scroll control 1

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Add = 30h

SCRSPD[5:0]

DIR1

DIR0

Default

000

Table 36. Scroll speed

1 step duration

SCLSPD[5:0]

[TFRAME][ms]

(1)

When the internal clock is used.

12.8

29.9

211

46.9

……

…

N x 4 + 3

(N x 4 + 3) x 10.24/2.4

……

…

252

1075

255

1088

Table 37. Scroll direction

DIR1

DIR0

Direction

Left

Right

Down

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