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MSM6222 Datasheet

  • MSM6222

  • OKI electronic componets [DOT MATRIX LCD CONTROLLER WITH 16...

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隆 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.).
DB
6
L
DB
0
H
ADC
L
0
L
L
H
7
H
In 1-line display mode
First
digit
00
2
01
3
02
4
05
5
04
6
05
7
06
8
07
9
08
79
4E
80
4F
Cursor and blink position
First
digit
00
40
In 2-line display mode
First line
Second line
2
01
41
3
02
42
4
03
43
5
04
44
6
05
45
7
06
46
8
07
47
9
08
48
39
26
66
40
27
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 (COM
1
to COM
16
, SEG
1
to SEG
40
, 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.
SEG
1
to SEG
40
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.
23/45

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