HD66766R Datasheet, PDF (70/97 Pages) Hitachi Semiconductor – 132 x 176-dot Graphics LCD Controller/Driver for 65K Colors

HD66766R
Rev. 1.0-1 / September 2002
Screen-division Driving Function
The HD66766R 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.
1/24 duty driving on 2 screen
COM1
COM7
COM26
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 54 Display example in 2-screen division driving
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