¡ Semiconductor

MSM9210

12/19

Segment Data Input [Function Mode: 0 to 3]

• MSM9210 receives the segment data when function mode 0 to 3 are selected.

• The same segment data is transferred to the 3 segment data latches corresponding to GRID 1

to 3 at the same time when the function mode 0 is selected.

• The segment data is transferred to only one segment data latch corresponding to the specified

GRID when the function mode is 1, 2 or 3 is selected.

• Segment output (SEG1 to 32) becomes High level (lightning) when the segment data (S1 to S32)

is set to "1".

[Data Format]

Input Data

: 35 bits

Segment Data : 32 bits

Mode Data

: 3 bits

FUNCTIONAL DESCRIPTION

Power-on Reset

When power is turned on, MSM9210 is initialized by the internal power-on reset circuit.

The status of the internal circuit after initialization is as follows:

• The contents of the shift registers and latches are set to "0".

• The digital dimming duty cycle is set to "0".

• All segment outputs are set to Low level.

• All grid outputs are set to High level.

Data Transfer Method

Data can be transferred between the rising edge and the next falling edge of chip select input.

The mode data, segment data and dimming data are written by a serial transfer method. The

serial data is input to the shift register at the rising edge of a shift clock pulse.

The mode data (M0 to M2) must be transferred after the segment data and dimming data

succeedingly.

When the chip select input falls, an internal LOAD signal is automatically generated and data is

loaded to the latches.

Function Mode

Function mode is selected by the mode data (M0 to M2). The relation between function mode and

mode data is as follows:

FUNCTION MODE

OPERATING MODE

FUNCTION DATA

M0

M1

M2

000

0

Segment Data for GRID1-3 Input

100

1

Segment Data for GRID1 Input

010

2

Segment Data for GRID2 Input

110

3

Segment Data for GRID3 Input

001

4

Digital Dimming Data Input

1

S1

2

S2

3

S3

4

S4

29

S29

30

S30

31

S31

32

S32

33

M0

34

M1

35

M2

Bit

Input Data

Segment Data (32bits)

Mode Data

(3bits)