MSM6222 OKI [OKI electronic componets], MSM6222 Datasheet - Page 23

• Manufacturer Part Number: MSM6222
• Description: DOT MATRIX LCD CONTROLLER WITH 16-DOT COMMON DRIVER AND 40-DOT SEGMENT DRIVER
• Manufacturer: OKI [OKI electronic componets]

¡ Semiconductor
Cursor/Blink Control Circuit
LCD Display Circuit (COM
In 2-line display mode
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.).
(Note) The cursor and blink are displayed even when the CG RAM address is set in the
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.
SEG
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.
1
to SEG
In 1-line display mode
ADC. For this reason, it is necessary to inhibit the cursor and blink display while
the CG RAM address is set in the ADC.
40
are used to display 8-digit display on the LCD. To expand the display, an
First line
Second line
ADC
1
First
digit
First
digit
to COM
DB
00
00
40
L
6
01
01
41
L
2
2
0
16
02
02
42
L
3
3
, SEG
05
03
43
L
4
4
1
04
04
44
H
5
5
to SEG
7
05
05
45
H
6
6
DB
40
06
06
46
H
7
7
, L, CP, DO, and DF)
0
07
07
47
8
8
08
08
48
9
9
Cursor and blink position
Cursor and blink position
MSM6222B-xx
79
4E
39
26
66
23/45
80
4F
40
27
67