MSM9000-XX 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM9000-XX

DOT MATRIX LCD CONTROLLER

Oki Electric Industry 

¡ Semiconductor

FEDL9000B-01

MSM9000B-xx

• CONT U/D (Contrast Up Down)

[1, 0, 0, X, 0, 0, 1, 1/0]

This command selects the voltage of VSS2, 3 that is used as the reference voltage for the LCD

bias. When the value of VSS2, 3 is changed, the contrast is changed accordingly.

The contrast is controlled by the value of the 3-bit up/down counter so that eight stages are

supported. The value of the up/down counter is incremented when "1" is entered by this

command and decremented when "0" is entered. The counter changes within the range of 0

to 7.

When the counter reaches 7, it goes back to "0".

According to the settings of N1 and N2, the contrast stages can be changed to 1 to 8, 2 to 9, or

3 to A.

At stage 0, the bias voltage is minimized. The larger the contrast stage, the higher the bias

voltage. At stage A, the bias voltage is maximized.

After a low RESET is input, the counter is set to the minimum value specified by N1 and N2.

Example: · · · 6´7´0´1´2´3´4´5´6´7´0 · · ·

Note: At some contrast stages, the bias voltage may be increased to 5.5 V or higher. Adjust

the stage so that the bias voltage does not exceed 5.5 V.

• STOP (Set Stop Mode)

[1, 0, 0, X, 0, 1, 0, 0]

This command sets standby mode. Specifically, the command stops the oscillation block to

prevent current form flowing through the oscillation block and outputs the VDD level to all

LCD output pins. Standby mode is canceled when D0 is set to "1" regardless of the setting of

the C/D pin. When a command or data with D0 set to "1" is entered, the command is executed

or the data is input. At the same time, standby mode is canceled.

After RESET = "L", standby mode is disabled.

• SOE/D (Serial Out Enable/Disable)

[1, 0, 0, X, 0, 1, 1, 1/0]

This command controls the impedance of the SO output pin. The command is valid only when

the serial interface is used. When D0 is set to "0", the SO pin is set in the high impedance state.

After RESET = "L", D0 is set to "0".

• DISP (Display On/Off)

[1, 0, 0, 1/0, 1, 0, 0, 1/0]

This command sets LCD display mode. When D0 is set to "1", the LCD is turned on. When

D0 is set to "0", the LCD is turned off, in which case, the VDD level is output to all segment and

common pins. When the LCD is turned ON (D0="1"), and D4 is set to "1", only arbitrators are

displayed and when D4 is set to "0", both characters and arbitrators are displayed. The table

below lists display modes.

After RESET = "L", both D4 and D0 are set to "0".

D4 D0

X

0

0

1

1

1

Characters

OFF

ON

OFF

Arbitrators

OFF

ON

ON

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