HD66765 Datasheet, PDF (68/71 Pages) Hitachi Semiconductor – 396-channel Segment Driver with Internal RAM for 4096-color Displays

HD66765
Screen-division Driving Function
The HD66765 can select and drive two screens at any position with the screen-driving position registers
(R14h and R15h). Any two screens required for display are selectively driven and a duty ratio is lowered
by LCD-driving duty setting (NL4-0), thus reducing LCD-driving voltage and power consumption.
For the 1st division screen, start line (SS17-10) and end line (SE17-10) are specified by the 1st screen-
driving position register (R14h). For the 2nd division screen, start line (SS27-20) and end line (SE27-20)
are specified by the 2nd screen-driving position register (R15h). The 2nd screen control is effective when
the SPT bit is 1. The total count of selection-driving lines for the 1st and 2nd screens must correspond to
the LCD-driving duty set value.
tion _COM1
ifica ^COM17
1/24 duty driving on 2 screen
ec _COM26
Preliminary ^{Sp COM42}
1st screen :
7 raster-row
driving
Always applying
non-selection
level
2nd screen :
17 raster-row
driving
Always applying
non-selection
level
- Driving duty : NL4-0 = "00010" (1/24 duty)
- 1st screen setting : SS17-10 = "00"H, SE17-10 = "06"H
- 2nd screen setting : SS27-20 = "19"H, SE27-20 = "29"H, SPT = "1"
Figure 51
Display example in 2-screen division driving
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