PT0801ARS-0 datasheet(10/65 Pages) POWERTIP

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Power Supply Reset

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.

Item

Symbol

Measuring

Condition

Standard Value

Unit

Min.

Typ.

Max.

Power Supply RISE

Time

trse

-----

0.1

-----

Power Supply OFF

Time

toff

-----

Page 1 of 3

Powertip Technology, Inc.

11/10/2004

http://www.powertipusa.com/ps.htm

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