MSM9201-01GS-BK Ver la hoja de datos (PDF) - Oki Electric Industry

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Fabricante

MSM9201-01GS-BK

Fluorescent Display Tube Controller Driver

Oki Electric Industry 

¡ Semiconductor

PEDL9201-03

MSM9201-01

Data Transfer Method and Command Write Method

Display control command and data are written by an 8-bit serial transfer.

Write timing is shown in the figure below.

Setting the CS pin to "Low" level enables a data transfer.

Data is 8 bits and is sequentially input into the DA pin from LSB (LSB first).

As shown in the figure below, data is read by the shift register at the rise of the shift clock, which

is input into the CP pin. If 8-bit data is input, internal load signals are automatically generated

and data is written to each register and RAM.

Therefore it is not necessary to input load signals from the outside.

Setting the CS pin to "High" disables data transfer. Data input from the point when the CS pin

changes from "High" to "Low" is recognized in 8-bit units.

CS

tDOFF

tCSH

CP

DA

B0 B1 B2 B3 B4 B5 B6 B7

LSB

MSB

1st byte

When data is written to DCRAM* Command and address data

B0 B1 B2 B3 B4 B5 B6 B7

LSB

MSB

2nd byte

Character code data

B0 B1 B2 B3 B4 B5 B6 B7

LSB

MSB

2nd byte

Character code data of the

next address

* When data is written to RAM (DCRAM, ADRAM, CGRAM) continuously, addresses are

internally incremented automatically.

Therefore it is not necessary to specify the 1st byte to write RAM data for the 2nd and later

bytes.

Reset Function

Reset is executed when the RESET pin is set to "L", (when turning power on, for example,) which

initializes all functions.

The initial status is as follows.

• Address of each RAM .................. address "00"H

• Data of each RAM ........................ All contents are undefined

• General output port ..................... All general output ports go "Low"

• Number of display digits ............ 24 digits

• Contrast adjustment ..................... 8/16

• All display lights ON or OFF ..... OFF mode

• Segment output ............................ All segment outputs go "Low"

• AD output ..................................... All AD outputs go "Low"

After reset is executed, perform settings again according to "Initial Setting Flowchart" shown

later.

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