¡ Semiconductor

ML9203-xx

13/30

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.

*

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

• Display digit .................................. 16 digits

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

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

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

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

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

B0

LSB

CS

CP

DA

B1 B2 B3 B4 B5 B6 B7

B0 B1 B2 B3 B4 B5 B6 B7

MSB

1st byte

LSB

MSB

2nd 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 of the

next address

Character code data