ML9204 Ver la hoja de datos (PDF) - Oki Electric Industry

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ML9204

5 × 7 Dot Character × 24-Digit × 2-Line Display Controller/Driver with Character RAM (Built-in Key Scan)

Oki Electric Industry 

OKI Semiconductor

PEDL9204-02

ML9204-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 DI/O 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

B0 B1B2 B3B4 B5 B6 B7 B0 B1B2 B3 B4 B5 B6 B7

DA

LSB

MSB LSB

MSB

1st byte

2nd byte

When data is written

to DCRAM*

Command and address data

Character code data

B0 B1B2 B3 B4 B5 B6 B7

LSB

MSB

3rd byte

Character code data of the

next address

* When data is written to RAM (DCRAM, ADRAM, CGRAM, GCRAM) 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.

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