hd66740 Renesas Electronics Corporation., hd66740 Datasheet - Page 19

• Manufacturer Part Number: hd66740
• Description: 112 X 80-dot Graphics Lcd Controller/driver - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

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
0
0
0
0
Figure 4
0
0
Figure 5
DB6 DB5 DB4 DB3 DB2 DB1
0
0
V
GND
LCD
Contrast-Control 1/2 Instruction
0
0
VR
R
R
R
R
R
0
HD66740
Contrast Adjuster
1
1
19
+
-
+
-
+
-
+
-
+
-
0
1
CT2
BS2
SW
V1
V2
V3
V4
V5
GND
CT4 CT3
BT1 BT0
CT1 CT0
BS1 BS0
DB0
(SW = 0)
(SW = 1)
(SW = 0)
(SW = 1)
HD66740