The internal reset circuit will be operating properly when the following power supply conditions are satisfied. If it is not operating properly, please perform the initial setting along with the instruction

Reset function

Initialization made by Internal Reset Circuit

The HD44780 automatically initializes (resets) when power is supplied (builtin internal reset circuit).

The following instructions are executed during initialization.

The busy flag (BF) is kept in busy state until initialization ends. (BF=1) The busy state is 10ms after Vdd reaches 4.5V.

1. Display clear

2. Function set

   DL=1 : 8 bit long interface data
   DL=0 : 4 bit
   F=0 : 5 * 7 dots character font
   N=1 : 2 lines
   N=0 : 1 line

3. Display ON/OFF control

   D=0 : Display OFF
   C=0 : Cursor OFF
   B=0 : Blink OFF

4. Entry mode set

   1/D=1 : +1(increment)
   S=0 : No shift

Note: When the power supply conditions, using internal reset circuit is not satisfied, the internal reset circuit will not function properly and initialization will not be performed.Please initialize using the MPU along with the instruction set.

Initialization along with instruction

If power supply conditions are not satisfied, for the proper operation of the internal reset circuit, it is necessary to initialize using the instructions.

Please use the following procedures: