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ML9058E Datasheet(PDF) 53 Page - LAPIS Semiconductor Co., Ltd. |
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ML9058E Datasheet(HTML) 53 Page - LAPIS Semiconductor Co., Ltd. |
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53 / 76 page  FEDL9058E-01 LAPIS Semiconductor ML9058E 53/76 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) ADC select: Incremented (ADC command DB0 = “L”) (4) Power control register: (DB2, DB1, DB0) = (0, 0, 0) (5) The registers and data in the serial interface are cleared. (6) LCD Power supply bias ratio: 1/9 bias (7) All display dots OFF (8) Read-modify-write: OFF (9) Static indicator: OFF Static indicator register: (DB1, DB0) = (0, 0) (10) Line 1 is set as the display start line. (11) The column address is set to address 0. (12) The page address is set to 0. (13) Common output state: Forward (14) Voltage V1 adjustment internal resistor ratio register: (DB2, DB1, DB0) = (1, 0, 0) (15) The electronic potentiometer register set mode is released. Electronic potentiometer register: (DB5, DB4, DB3, DB2, DB1, DB0) = (1, 0, 0 ,0, 0, 0) (16) The LCD drive method is set to the frame reversal drive. Line reversal number register: (DB4, DB3, DB2, DB1, DB0) = (1, 0, 0, 0, 0) On the other hand, when the reset command is used, only the conditions (8) to (15) 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. When the built-in LCD drive power supply circuit of the ML9058E is not used, it is necessary that RES = “L” when the external LCD drive power supply goes ON. During the period when RES = “L”, although the oscillator circuit is operating, the display timing generator would have stopped and the pins CL, FR, FRS, and DOF would have been tied to the “H” level. There is no effect on the pins DB0 to DB7. |
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