NT7501 Ver la hoja de datos (PDF) - Novatek Microelectronics
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NT7501 Datasheet PDF : 38 Pages
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NT7501
10. Entire Display ON
Forcibly turns the entire display on regardless of the contents of the display data RAM. At this time, the contents of the
display data RAM are held.
This command has priority over the Normal/Reverse Display command. When D is low, the normal display status is
provided.
A0 E R W D7 D6 D5 D4 D3 D2 D1 D0
RD WR
0 1 0 1010010D
When D is high, the Entire display ON status is provided. If the Entire Display ON command is executed during the display
OFF status, the LCD panel enters Power Save mode. Refer to the Power Save section for details.
11. Set LCD Bias
Selects a bias ratio for the voltage required for driving the LCD. This command is enabled when the voltage follower in the
power supply circuit operates.
A0 E R W D7 D6 D5 D4 D3 D2 D1 D0
RD WR
0 1 0 1010001D
The potential V0 is resistively divided inside the IC to produce potentials V1, V2, V3 and V4 which are necessary to drive
the LCD. The bias ratio can be selected using the LCD bias setting command.
Moreover, the potentials V1, V2, V3 and V4 are converted in the impedance and supplied to the LCD drive circuit.
Duty
1/33
Bias ratio of LCD power supply
1/5 bias or 1/6 bias
12. Read-Modify-Write
A pair of Read-Modify-Write and End commands must always be used. Once a Read-Modify-Write is issued, the column
address is not incremental by the Read Display Data command but incremented by the Write Display Data command only.
It continues until the End command is issued. When the End command is issued, the column address returns to the
address before the Read-Modify-Write was issued. This can reduce the microprocessor load when data of a specific
display area is repeatedly changed during cursor blinking or others.
A0 E R W D7 D6 D5 D4 D3 D2 D1 D0
RD WR
01 0 11100000
Note: Any command except Read/Write Display Data and Set Column Address can be issued during Read-Modify-
Write mode.
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