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NJU6635CH

16-CHARACTER 2-LINE DOT MATRIX LCD CONTROLLER DRIVER

Japan Radio Corporation  

NJU6635

(2)Power on Initialization by internal circuits

(2-1) Initialization By internal Reset circuits

The NJU6635 is initialized automatically by the internal power on initialization circuits when the power

is turned on. In the internal power on initialization, following instructions are executed.

During the internal power on initialization, the busy flag (BF) is “1” and this status is kept 10ms after

VDD = 4.5V.

Initialization flow is shown below:

Clear Display

Function Set

DL=1

A=0

M0=0

M1=0

E=0

:8-bit long interface data

:Addressing mode 1

:A mode

:32-character 1-line

:Normal Display mode

Display On/Off

Control

D=0 :Display Off

C=0 :Cursor Off

B=0 :Cursor Blink Off

Entry Mode Set

I/D=1 :Increment by 1

S=0 :No Shift

Note) If the condition of power supply rise time described in the Electrical Characteristics is not satisfied, the

internal Power on initialization Circuits will not operate and initialization will not be performed.

In this case, the initialization by MPU software is required.

(2-2) Initialization By Hardware

The NJU6635 incorporates RESET terminal to initialize the all system. When the “L” level input over

than 1.2ms to the RESET terminal, the reset sequence is executed. In this time, the busy signal output

during 10ms after RESET terminal goes to “H”.

• RESET operation

RESET

System clock

C

Q

Counter

RST

CQ

RST

RS-F/F

System RESET

Power No

RESET

• Operation timing

External Reset

Signal

Over 1.2ms

Counter Output

RS-F/F Output

Internal Reset

Signal

BUSY

10ms

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