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LC74787M Datasheet(PDF) 11 Page - Sanyo Semicon Device |
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LC74787M Datasheet(HTML) 11 Page - Sanyo Semicon Device |
11 / 23 page No. 5730-11/23 LC74787, 74787M, 74787JM COMMAND2: Vertical display start position and vertical character size setup command • First byte DA Register Contents Notes 0 to 7 State Function 7 — 1 6 — 0 Command 2 identification code. 5 — 1 Sets the vertical display start position and the vertical character size. 4 — 0 3 VS21 0 1 Second line vertical character size 2 VS20 0 1 1 VS11 0 1 First line vertical character size 0 VS10 0 1 VS20 0 1 VS21 0 1H/dot 2H/dot 1 3H/dot 1H/dot The vertical display start position is set by the 6 bits VP0 to VP5. The weight of bit 1 is 2H. • Second byte DA Register Contents Notes 0 to 7 State Function 7 — 0 Second byte identification bit 6 FS 0 Crystal oscillator frequency: 2fsc 1 Crystal oscillator frequency: 4fsc 5 VP5 0 If VS is the vertical display start position then: (MSB) 1 VS = α + H × (2Σ 2n VPn) 4 VP4 0 H: the horizontal synchronization pulse period 1 α = 20 H (in 525-line systems) 3 VP3 0 = 25 H (in 625-line systems) 1 2 VP2 0 1 1 VP1 0 1 0 VP0 0 (LSB) 1 Note: All registers are set to 0 when the LC74787/M/JM is reset by the RST pin. 5 n=0 VS10 0 1 VS11 0 1H/dot 2H/dot 1 3H/dot 1H/dot Character display area |
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