ML9207 データシートの表示（PDF） - Oki Electric Industry

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ML9207

5 ×7 Dot Character ×24-Digit Display Controller/Driver with Character RAM

Oki Electric Industry 

OKI Semiconductor

FEDL9207-02

ML9207-xx

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 rising edge 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

CP

tCSH

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) and initializes all

functions.

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 (P1 to P4) go "Low"

• Display digit.....................................................24 digits

• Brightness adjustment ......................................0/1024

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

• Segment output ................................................All segment outputs (SEG1 to SEG35) go "Low"

• Common output................................................All common outputs (COM1 to COM24) go "Low"

• AD output ........................................................All AD outputs (AD1 to AD4) go "Low"

Please set the functions again according to "Setting Flowchart" after reset.

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