HD66717 Datasheet, PDF (32/90 Pages) Hitachi Semiconductor – (Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver)

HD66717
Contrast Control
The contrast control instruction (Figure 14) includes the SN and CT bits.
SN2: Combined with the SN1 and SN0 bits described in the Scroll Control section to select the first line
to be scrolled (display-start line).
CT3–CT0: Controls the LCD drive voltage (potential difference between V_CC and V5) to adjust contrast
(Figure 15 and Table 12). Refer to the Contrast Adjuster section.
RS R/W DB7
DB0
0 0 0 1 0 SN2 CT3 CT2 CT1 CT0
Figure 14 Contrast Control Instruction
HD66717
V_CC
V1 ^R
+
–
V2 ^R
+
–
R
V3 ^R
+
–
V4 ^R
+
–
V5 ^R
+
–
VR
V_EE
Figure 15 Contrast Adjuster
484