hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 66

• Manufacturer Part Number: hd66789
• Description: 528-channel, One-chip Driver For Amorphous Tft Panels With 262,144-color Display Ram, Power Supply Circuit, And Gate Circuit
• Manufacturer: Renesas Electronics Corporation.

HD66789
Vertical Scroll Control (R41h)
VL7–0: Specify the number of raster-rows that are scrolled and control smooth scrolling in the vertical
direction. The number of raster-rows is specified from 0 to 240. The raster-rows of the specified number
are scrolled during display. When the 240th raster-row is displayed, the scrolling display starts afresh from
the 1st raster-row. The number of raster-rows that are scrolled (VL7–0) can be specified when the first
screen vertical scroll enable bit VLE1 = 1 or the second screen vertical scroll enable bit VLE2 = 1. The
number of raster-rows is fixed (not changeable) when VLE2-1 = 00. This function is not available in the
external display interface mode.
VL Bits and Display-start Raster-row
VL7
0
0
0
.
.
1
1
Note: When setting the number of raster-rows for scrolling, it must be 239 or less.
1st-Screen Drive Position (R42h)
2nd-Screen Drive Position (R43h)
SS17–10: Specify the start position for driving the first screen by line. The liquid crystal is driven by from
the gate driver of “the set value + 1”.
SE17–10: Specify the end position for driving the first screen by line. The liquid crystal is driven by to the
gate driver of “the set value + 1”. For instance, when SS17–10 = “07”H and SE17–10 = “10”H, the liquid
crystal is driven from G8 to G17, and black display is driven from G1 to G7, and G18 thereafter. Make
sure that SS17–10 d SE17–10 d “EF”H. For details, see the “Screen-split Drive Function” section.
Rev.0.12, May 09 2003, page 66 of 156
R/W
W
W
R/W
W
VL6
0
0
0
.
.
1
1
RS
1
1
RS
1
IB15 IB14 IB13 IB12 IB11 IB10 IB9
SE17 SE16 SE15 SE14 SE13 SE12 SE11 SE10 SS17 SS16 SS15 SS14 SS13 SS12 SS11 SS10
SE27 SE26 SE25 SE24 SE23 SE22 SE21 SE20
VL5
0
0
0
.
.
1
1
IB15 IB14 IB13 IB12 IB11 IB10
0
VL4
0
0
0
.
.
0
0
0
VL3
0
0
0
.
.
1
1
0
0
VL2
0
0
0
.
.
1
1
0
VL1
0
0
1
.
.
1
1
0
VL0
0
1
0
.
.
0
1
IB9
IB8
0
IB8
IB7
SS27 SS26 SS25 SS24 SS23 SS22 SS21 SS20
0
Amount of Scrolling (Number of raster-row)
0 raster-row
1 raster-row
2 raster-rows
.
.
238 raster-rows
239 raster-rows
VL7
IB7 IB6
IB6
VL6 VL5 VL4 VL3 VL2 VL1 VL0
IB5
IB5
IB4
IB4
IB3
IB3
IB2
Preliminary
IB2 IB1
IB1
IB0
IB0