MSB

D6

D5

D4

D3

D2

D1

LSB

1

1

1

0

0

A1

A0

R/W

Note: D3~D7 should not be changed. When writing, D0 R/W=0, so the addresses are:

A1

A0

Address

0

0

0xE0

0

1

0xE2

1

0

0xE4

1

1

0xE6

IIC Communication

The data of microprocessor communicate with the LED driver control IC via two-line bus

interface. During data input, DIN signal must keep unchanged when CLK is at high level.

Only when CLK clock signal is at low level can DIN signal be changed. The condition of

starting data input is that DIN changes from high to low when CLK is at high level, and

its condition of ending is that DIN changes from low to high when CLK is at high level,

which is in accordance with IIC communication protocol.

The operation of writing LED display data shall follow the principle of “from low bit to

high bit” of display address and “from low bit to high bit” of data byte.