FEDL9477-01

ML9477

11/20

FUNCTIONAL DESCRIPTION

Description of Operation

 Display data input

As described in the section on “Data Structure,” display data consists of a data field, which corresponds to the

LCD segments ON and OFF, and a command field, which indicates the input of display data.

Set a value in each of bits C0 and C1 in the command field according to the common output that corresponds to

the display data, and set a display data input command in the remaining four bits.

Data that has been input to the DATA_IN pin is loaded into the shift register on the rising edges of the CLOCK

pulses, transferrred to the display data latch during the “H” level period of the LOAD pulse, and then output via

the segment driver.

D1

D2

D3

D4

D30 D31 D32 C0

C1

C2

C3

C4

CLOCK

DATA_IN

Old data

New data

LOAD

Display output

C5