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

Cursor/Blink Control Circuit

This is a circuit that generates the LCD cursor and blink.

This circuit is under the control of the CPU program.

The display of the cursor and blink on the LCD is made at a position corresponding to the

DD RAM address that is set in the ADC.

The figure below shows an example of the cursor/blink position when the value of ADC

is set to "07" (hex.).

DB6

DB0

ADC L L L L H H H

0

7

First

digit 2 3 4 5 6 7 8 9

In 1-line display mode 00 01 02 05 04 05 06 07 08

79 80

4E 4F

Cursor and blink position

First

digit 2 3 4 5 6 7 8 9

In 2-line display mode First line

00 01 02 03 04 05 06 07 08

Second line 40 41 42 43 44 45 46 47 48

39 40

26 27

66 67

Cursor and blink position

(Note) The cursor and blink are displayed even when the CG RAM address is set in the

ADC. For this reason, it is necessary to inhibit the cursor and blink display while

the CG RAM address is set in the ADC.

LCD Display Circuit (COM1 to COM16, SEG1 to SEG40, L, CP, DO, and DF)

As the MSM6222B-xx provides the COM signal outputs (16 outputs) and the SEG signal

outputs (40 outputs), it can display 8 characters (1-line display) or 16 characters (2-line

display) as a unit.

SEG1 to SEG40 are used to display 8-digit display on the LCD. To expand the display, an

MSM5259 is used.

The MSM5259, 40-dot segment driver, is used for expansion of the SEG signal output.

Interface with the MSM5259 is made through data output pin (DO), clock output pin (CP),

latch output pin (L), and display frequency pin (DF). The character pattern data is serially

transferred to MSM5259 through DO and CP. When the data of 72 characters 360-bit (= 5-

bit/ch. x 72 ch. = 1-line display) or 32 characters 160-bit (5-bit/ch. x 32 ch. = 2-line display)

is output, the latch pulse is also output through pin L. By this latch pulse, the data

transferred serially to MSM5259 is latched to be used as display data. The display

frequency signal (DF) required when LCD is displayed is also output from DF pin

synchronously with this latch pulse.

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