NJU6475B 데이터 시트보기 (PDF) - Japan Radio Corporation

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NJU6475B

12-Character 4-Line Dot Matrix Low Power LCD Controller Driver with key Scan Function

Japan Radio Corporation  

NJU6475B

(2) Power on Initialization by internal circuits

(2-1) Internal Reset circuits Initialization

The NJU6475B is automatically initialized by 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 during 6ms

(fOSC=180KHz) after VDD rose to 2.4V.

Initialization sequence

Set Function

PD=1 : Power down OFF

Contrast Control

Set (00)H to the contrast register

Display ON/OFF

Control

Set Mode Entry

D=0 : Display OFF

C=0 : Cursor OFF

B=0 : Cursor Blink OFF

I/D=1 : Increment by 1

S=0 : Non shift

Clear Display

END

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

internal Power On Initialization will not performed.

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

(2-2) Hardware Initialization

The NJU6475B prepares RESET terminal to initialize the all system.

When the "L" level is input over 1.2ms to the RESET terminal, reset sequence is executed. In this time, the

busy signal is output during 6ms (fOSC=180KHz) after RESET terminal went to "H".

-Timing Chart

Over 1.2ms

External Reset

Signal

6ms

BUSY

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