NJU6637 데이터 시트보기 (PDF) - Japan Radio Corporation
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NJU6637 Datasheet PDF : 28 Pages
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Preliminary
NJU6637
(1-9) Cursor Blinking Control Circuit
This circuits controls cursor On/Off and cursor position character blinks. The cursor or blinks
appears in the digit position at the DD RAM address set in the address counter(AC).
When the address counter is (08)H, a cursor position is shown as follows:
AC6 AC5 AC4 AC3 AC2 AC1 AC0
AC 0
0
0
1
0
0
0
1
1st line 00
2nd line 10
3rd line 20
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 ← Display Position
01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F ← DD RAM Address
11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F
(Hexadecimal)
21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F
Cursor Position
Note) The cursor or blinks appears when the address counter (AC) selects the CG RAM.
But the displayed cursor and blink are meaningless.
If the AC stores the CG RAM address data, the cursor and blink are displayed in the meaningless position.
(2)Power on Initialization by internal circuits
(2-1) Initialization By internal Reset circuits
The NJU6637 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 is kept 4ms after VDD = 2.4V. (fosc=145KHz)
Initialization flow is shown below:
Display On/Off
Control
D=0
:Display Off
C=0
:Cursor Off
B=0
:Cursor Blink Off
Entry Mode Set
I/D=1
S=0
:Increment by 1
:No Shift
Clear Display
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 NJU6637 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 initialization during
4ms after RESET terminal goes to “H”.
• Operation timing
Over 1.2ms
Initialization set time
4ms
External Reset
Signal
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