HD66717 Datasheet, PDF (33/90 Pages) Hitachi Semiconductor – (Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver)

HD66717
Scroll Control
The scroll control instruction (Figure 16) includes the SN and SL bits.
SN1, SN0: Combined with the SN2 bit described in the Contrast Control section to select the top line to
be displayed (display-start line) through the data output from the COM1 pin (Table 13). After first five
lines are displayed from the top line, the cycle is repeated and scrolling continues.
Table 12 CT Bits and Variable Resistor Value of Contrast Adjuster
CT3 CT2 CT1 CT0 Variable Resistor Value (VR)
0
0
0
0
6.4 x R
0
0
0
1
6.0 x R
0
0
1
0
5.6 x R
0
0
1
1
5.2 x R
0
1
0
0
4.8 x R
0
1
0
1
4.4 x R
0
1
1
0
4.0 x R
0
1
1
1
3.6 x R
1
0
0
0
3.2 x R
1
0
0
1
2.8 x R
1
0
1
0
2.4 x R
1
0
1
1
2.0 x R
1
1
0
0
1.6 x R
1
1
0
1
1.2 x R
1
1
1
0
0.8 x R
1
1
1
1
0.4 x R
RS R/W DB7
DB0
0 0 0 1 1 SN1 SN0 SL2 SL1 SL0
Figure 16 Scroll Control Instruction
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