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13. Dot Matrix LCD Controller (H8/3857 Group)
13.1.2
Block Diagram
Figure 13.1 shows a block diagram of the LCD controller.
COM17/
SEG56
Common/segment
driver
MPX
Blink register
Contrast control
register
LCD drive level power supply selection circuit
V1OUT
V4OUT
V2OUT
V5OUT
V3OUT
Rev.3.00 Jul. 19, 2007 page 328 of 532
REJ09B0397-0300
COM32/
COM16/
SEG40
SEG1
SEG41
SEG57
Common/segment
Segment driver
Level shifter
MPX
Blink control
Latch 2
Latch 1
64 × 32-bit display memory
X decoder
Display data register
LCD drive step-up circuit
V3
V
VLOUT
LCD
V34
V4
Figure 13.1 Block Diagram of LCD Controller
COM9/
SEG64 COM8
COM1
Common driver
driver
MPX
MPX
Decoder
Comparator
M
P
X
C1+
C2+
RS
Vci
C1–
C2–
R/W
Common counter
Blink counter
Blink start
line register
Blink end
line register
Display
line counter
Display start
line register
Address register
Control register 1/2
Index register
Frame frequency
setting register
CPU interface
DB7
DB4
DB1
DB6
DB3
DB0
STRB
DB5
DB2
Chip-internal I/O port interface
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