HD66789 Datasheet, PDF (66/156 Pages) Renesas Technology Corp – 528-channel, One-chip Driver for Amorphous TFT Panels with 262,144-color display RAM, Power Supply Circuit, and Gate Circuit

HD66789
Vertical Scroll Control (R41h)
Preliminary
R/W RS
W1
IB15 IB14 IB13 IB12 IB11 IB10 IB9 IB8 IB7 IB6 IB5 IB4 IB3 IB2 IB1 IB0
00000
0 0 0 _{VL7 VL6 VL5 VL4 VL3 VL2 VL1} VL0
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 VL6 VL5 VL4 VL3 VL2 VL1 VL0 Amount of Scrolling (Number of raster-row)
0
0
0
0
0
0
0
0
0 raster-row
0
0
0
0
0
0
0
1
1 raster-row
0
0
0
0
0
0
1
0
2 raster-rows
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1
1
1
0
1
1
1
0
238 raster-rows
1
1
1
0
1
1
1
1
239 raster-rows
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)
R/W RS
W1
IB15 IB14 IB13 IB12 IB11 IB10 IB9 IB8 IB7 IB6 IB5 IB4 IB3 IB2 IB1 IB0
SE17 SE16 SE15 SE14 SE13 SE12 SE11 SE10 SS17 SS16 SS15 SS14 SS13 SS12 SS11 SS10
W 1 SE27 SE26 SE25 SE24 SE23 SE22 SE21 SE20 SS27 SS26 SS25 SS24 SS23 SS22 SS21 SS20
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 ≤ SE17–10 ≤ “EF”H. For details, see the “Screen-split Drive Function” section.
Rev.0.12, May 09 2003, page 66 of 156