NJU3426 NJR Corporation, NJU3426 Datasheet - Page 6

• Manufacturer Part Number: NJU3426
• Description: 16-SEGMENT × 14-Digit VFD Controller / Driver
• Manufacturer: NJR Corporation

NJU3426
(4) DISPLAY SHIFT OPERATION
STEP1) Setting display images in the display data RAM
SETP2) Setting the “Initial character address” to C
STEP3) Changing the “Initial character address” to C
Character
address
Timing output
terminals
Character
Display image
Character
address
Timing output
terminals
Character
Display image
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The display shift operation can be performed by changing the “Initial character address” of the “Command register 2”.
And, the number of digits for the display shift in the loop is determined by the “Shifting display digits” of the
“Command register 1”. In other words, shifting display area ranges from the “Initial character address” specified by the
“Command register 2” to the last address designated by the “Command register 1”.
The default value of the “Initial character address” is C
addition, supposing that the value of the “Shifting display digits” is “N”, the “Initial character address” must be set in the
range between C
addresses beyond the range of the digit “N”, the display images, initially set, appear on these addresses. Just for
reference, one character of display image is composed of 16 segments.
Display RAM data
Character address
Display image
HOW TO SET LEFT DISPLAY SHIFT
The left display shift is carried out by incrementing the “Initial character address” gradually like C
C
provides the example on how to set the left display shift, using alphanumeric display images such as “0”, “1”,
“2”, ---, “9”, “A”, “B”, ---, and “E”.
In this setting, the display images of "2", "3”,- - - appear on the T
image “0” is on the T
don’t shift but remain on the T
character addresses are outside of the digit “N”.
N
. To the contrary, decrementing the address performs right display shift. The following description
0
C
C
and C
1
2
N
in order not to exceed the digit “N”. Because the display shift operation doesn’t apply to the
C
0
0
11
T
T
C
C
1
1
0
pin, which is assigned to the 12
0
2
3
C
1
1
12
C
2
2
and T
C
3
T
T
3
C
C
2
2
13
1
1
2
3
4
and the “Shifting display digits N” to 12 (T
pins, assigned to the 13
C
3
4
, and leaving the “Shifting display digits N” as 12 (T
4
1
C
5
5
(0,0,0,1), as shown in the table of “Display data RAM”. In
C
6
6
th
C
T
character address. The display images “D” and “E”
C
T
11
11
C
7
12
10
10
0
7
Shifting display digits
Shifting display digits
C
th
8
8
and 14
0
, T
C
9
1
9
, T
T
T
12
th
12
C
C
11
11
C
characters respectively, because their
2
0
1
A
, - - - T
10
C
B
11
10
C
11
pins respectively, and the
C
T
T
12
).
13
13
C
C
12
12
13
13
is not shifted.
is not shifted.
C
D
13
C
E
11
Ver.2003-03-06
14
2
).
, C
3
T
T
C
C
14
14
, C
13
13
14
14
4
, ---