hd66740 Renesas Electronics Corporation., hd66740 Datasheet - Page 27

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

Vertical Scroll Control 1/2
SN3-0: Set SN2 to SN0 bits when SW = 0.
line output from COM1. Because the CGRAM is assigned a 10-line display area, the data is displayed
sequentially from the first line to the 10th line then repeated from the first line again. In partial smooth
scrolling, these bits specify the display start line for the next line of the fixed-display line. For details,
see the Partial Smooth Scroll Display Function section.
SL2–0: Select the top raster-row to be displayed (display-start raster-row) in the display-start line
specified by SN2 to SN0. Any raster-row from the first to eighth can be selected (table 12). This function
is used to achieve vertical smooth scrolling together with SN2 to SN0. For details, see the Vertical
Smooth Scroll section.
Table 11
SN3
0
0
0
0
0
0
0
0
1
1
SN2
0
0
0
0
1
1
1
1
0
0
SN Bits and Display-start Lines
R/W RS DB7
0
0
Figure 10
SN1
0
0
1
1
0
0
1
1
0
0
0
0
0
0
DB6 DB5 DB4 DB3 DB2 DB1
SN0
0
1
0
1
0
1
0
1
0
1
1
1
Vertical Scroll Control 1/2 Instruction
0
0
Set the SN3 bit when SW = 1.
0
1
Display-start Line
1st line
2nd line
3rd line
4th line
5th line
6th line
7th line
8th line
9th line
10th line
27
1
0
SN2
<0>
SL2
<0>
SN1 SN0
SL1 SL0
PS1 PS0
<0> SN3
DB0
(SW = 0)
(SW = 1)
(SW = 0)
(SW = 1)
Specify the display start
HD66740