ML9445 Datasheet, PDF (69/84 Pages) List of Unclassifed Manufacturers – 180-Channel LCD Driver with Built-in RAM for LCD Dot Matrix Displays

FEDL9445-02
ML9445
Initialized Condition Using the RES pin
This LSI goes into the initialized condition when the RES input goes to the “L” level. The initialized condition
consists of the following conditions.
(1) Display OFF
(2) Forward display mode
(3) All-on display off
(4) Common output state: Forward
(5) Display start line: Set to 1^st line, Indicator address: Set to 80H
(6) Page address: Set to 0 page
(7) Column address: Set to 0 address
(8) Display data input direction: Column direction
(9) ADC select: Incremented (ADC command DB0 = “L”)
(10) n-line inversion drive: OFF
(11) n-line reversal number register: (DB4, DB3, DB2, DB1, DB0) = (1, 0, 0, 0, 0)
(12) Display duty set: 1/65Duty, Start Line COM0
(13) Read-modify-write: OFF
(14) Built-in oscillation circuit: OFF
(15) Oscillation frequency register: (DB4, DB3, DB2, DB1, DB0) = (0, 0, 0, 0)
(16) Power control register: (DB4, DB3, DB2, DB1, DB0) = (0, 0, 0, 0)
(17) Voltage V1 adjustment internal resistor ratio register: (DB2, DB1, DB0) = (1, 0, 0)
(18) LCD Power supply bias ratio: 1/9 bias
(19) The electronic potentiometer register set mode is released.
Electronic potentiometer register: (DB5, DB4, DB3, DB2, DB1, DB0) = (1, 0, 0, 0, 0, 0)
(20) Discharge: OFF
(21) Power save: OFF
(22) Temperature gradient resistor: (DB2, DB1, DB0) = (0, 0, 0) (0.00%/°C)
(23) Register data in the serial interface: Clear
(24) Temperature sensor: OFF
(25) Common Output Direction: Normal
(26) Multiplier Clock Frequency: (DB1, DB0)=(0,0)
On the other hand, when the reset command is used, only the conditions (6) to (7), (13) above are set. As is shown
in the “MPU Interface (example for reference)”, the RES pin is connected to the Reset pin of the MPU and the
initialization of this LSI is made simultaneously with the resetting of the MPU. This LSI always has to be reset
using the RES pin at the time the power is switched ON. Also, excessive current can flow through this LSI when
the control signal from the MPU is in the high impedance state. It is necessary to take measures to ensure that the
input pins of this LSI do not go into the high impedance state after the power has been switched ON.
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