HD66765 Datasheet, PDF (26/71 Pages) Hitachi Semiconductor – 396-channel Segment Driver with Internal RAM for 4096-color Displays

HD66765
Formula for the frame frequency
fosc
Frame frequency =
[Hz]
Clock cycles per raster-row × division ratio × 1/duty cycle
fosc: R-C oscillation frequency
Duty: drive duty (NL bit)
Division ratio: DIV bit
Clock cycles per raster-row: (RTN + 25) clock cycles
tion ^{Vertical Scroll Control (R11h)}
ifica ^{R/W RS}
W1
DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
VL27 VL26 VL25 VL24 VL23 VL22 VL21 VL20 VL17 VL16 VL15 VL14 VL13 VL12 VL11 VL10
ec _{Figure 15 Vertical Scroll Control Instruction}
Sp ^{VL17–10: Specify the display-start raster-row at the 1st screen display for vertical smooth scrolling.}
Any raster-row from the first to 176th can be selected. After the 176th raster-row is displayed, the
y _{display restarts from the first raster-row. The display-start raster-row (VL17–10) is valid only when}
ar ^{VLE1 = 1. The raster-row display is fixed when VLE1 = 0. (VLE1 is the 1st-screen vertical-scroll}
enable bit.)
in _{VL27–20: Specify the display-start raster-row at the 2nd screen display. The display-start raster-row}
lim ^{(VL27–20) is valid only when VLE2 = 1. The raster-row display is fixed when VLE2 = 0. (VLE2 is the}
2nd-screen vertical-scroll enable bit.) The vertical scroll for the 1st and 2nd screens can be independently
Pre ^set.
Table 22 VL Bits and Display-start Raster-row
VL27 VL26 VL25 VL24 VL23 VL22 VL21
VL17 VL16 VL15 VL14 VL13 VL12 VL11
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
:
:
:
:
:
:
:
1
0
1
0
1
1
1
1
0
1
0
1
1
1
Note: Do not set over the 176th (AFH) raster-row.
VL20
VL10
0
1
0
:
0
1
Display-start Raster-row
1st raster-row
2nd raster-row
3rd raster-row
:
175th raster-row
176th raster-row
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