MSM6222B-XX 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM6222B-XX

DOT MATRIX LCD CONTROLLER WITH 16-DOT COMMON DRIVER AND 40-DOT SEGMENT DRIVER

Oki Electric Industry 

¡ Semiconductor

MSM6222B-xx

Instruction Code

The instruction code is defined as the signal through which the MSM6222B-xx is accessed

by the CPU.

The MSM6222B-xx begins operation upon receipt of the instruction code input.

As the internal processing operation of MSM6222B-xx starts in a timing that does not affect

the LCD display, the busy status continues for longer than the CPU cycle time.

Under the busy status (when the busy flag is set to "H"), the MSM6222B-xx does not execute

any instructions other than the busy flag read.

Therefore, the CPU has to verify that the busy flag is set to "L" prior to the input of the

instruction code.

(1) Display clear:

R/W RS DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

Instruction code L L L L L L L L L H

When this instruction is executed, the LCD display is cleared.

I/D in the entry mode setting is set to "H" (increment). SH does not change.

When the cursor and blink are in display, the blinking position moves to the left end of the

LCD (the left end of the first line in the 2-line display mode).

(Note) All DD RAM data goes to "20" (hex.), while the address counter (ADC) goes to "00"

(hex.). The execution time is 1.64 ms (max.), when the OSC oscillation frequency

is 250 kHz.

(2) Cursor home

R/W RS DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

Instruction code L L L L L L L L H X

X : Don't Care

When this instruction is executed, the blinking position moves to the left end of the LCD

(to the left end of the first line in the 2-line display mode) as the cursor and blink are being

displayed.

When the display is in shift, the display returns to its original position before shifting.

(Note) The address counter (ADC) goes to "00" (hex.). The execution time is 1.64 ms

(max.), when the OSC oscillation frequency is 250 kHz.

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