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PT6955 V1.5

- 12 -

June, 2005

LED Driver IC

PT6955

RECOMMENDED SOFTWARE FOLWCHART

START

SET

COMMAND2

(WriteData)

SET

COMMAND2

(READ KEY & WRITE

DATA INCLUDED)

SET

COMMAND3

END

INITIAL

SETTING

MAIN

LOOP

SET

COMMAND3

Clear Display RAM

(See Note 5)

SET

COMMAND1

MAIN

PROGRAM

SET

COMMAND4

SET

COMMAND4

(88H ~ 8FH : Display ON)

Delay 200 ms

SET

COMMAND1

Notes:

1. Command 1: Display Mode Commands

2. Command 2: Data Setting Commands

3. Command 3: Address Setting Commands

4. Command 4: Display Control Commands

5. When IC power is applied for the first time, the contents of the Display RAM are not defined; thus, it

is strongly suggested that the contents of the Display RAM must be cleared during the initial setting.