HD66740 Datasheet, PDF (19/95 Pages) Hitachi Semiconductor – 112 x 80-dot Graphics LCD Controller/Driver

HD66740
Contrast Control 1/2
SW: Switches the bit configuration for the contrast control instruction.
CT4–CT0: When SW = 0, they control the LCD drive voltage (potential difference between V1 and
GND) to adjust contrast. A 64-step adjustment is also possible by using the CT5 bit which are set in the
entry mode register. For details, see the Contrast Adjuster section.
R/W RS DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
CT4 CT3 (SW = 0)
0
0
0
00
1
0
SW
BT1 BT0
(SW = 1)
CT2 CT1 CT0 (SW = 0)
0 0 0 0 0 1 1 _{BS2 BS1 BS0 (SW = 1)}
Figure 4 Contrast-Control 1/2 Instruction
HD66740
VLCD
VR
R
+
-
V1
R
+
-
V2
+
-
V3
R0
R
R
GND
+
-
V4
+
-
V5
GND
Figure 5 Contrast Adjuster
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