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HD44780UA02TF Datasheet(PDF) 45 Page - Hitachi Semiconductor |
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HD44780UA02TF Datasheet(HTML) 45 Page - Hitachi Semiconductor |
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45 / 59 page  HD44780U 45 Initializing by Instruction If the power supply conditions for correctly operating the internal reset circuit are not met, initialization by instructions becomes necessary. Refer to Figures 23 and 24 for the procedures on 8-bit and 4-bit initializations, respectively. Power on Wait for more than 15 ms after VCC rises to 4.5 V Wait for more than 4.1 ms Wait for more than 100 µs RS 0 R/W 0 DB7 0 DB6 0 DB5 1 DB4 1 DB3DB2 DB1 DB0 **** RS 0 R/W 0 DB7 0 DB6 0 DB5 1 DB4 1 DB3 DB2 DB1 DB0 **** RS 0 R/W 0 DB7 0 DB6 0 DB5 1 DB4 1 DB3 DB2 DB1 *** DB0 * RS 0 R/W 0 DB7 0 DB6 0 DB5 1 DB4 1 DB3 N DB2 F DB1 DB0 ** 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 1 0 0 I/D 0 1 S Initialization ends BF cannot be checked before this instruction. Function set (Interface is 8 bits long.) BF cannot be checked before this instruction. Function set (Interface is 8 bits long.) BF cannot be checked before this instruction. Function set (Interface is 8 bits long.) BF can be checked after the following instructions. When BF is not checked, the waiting time between instructions is longer than the execution instuction time. (See Table 6.) Function set (Interface is 8 bits long. Specify the number of display lines and character font.) The number of display lines and character font cannot be changed after this point. Display off Display clear Entry mode set Wait for more than 40 ms after VCC rises to 2.7 V Figure 23 8-Bit Interface |
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