PT6314 Datasheet, PDF (15/49 Pages) Texas Instruments – 3 Amp Adjustable Positive Step-down Integrated Switching Regulators

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Dot Character VFD Controller/Driver IC
PT6314
DISPLAY DATA RAM (DDRAM)
The Display Data RAM (DDRAM) stores the display data shown in the 8-bit character codes. When
expanded the Display Data RAM supports a capacity of 80 x 8 bits or 80 characters. The area in the
DDRAM that is not in used for display may be used as general data RAM.
High Order Bits
Low Order Bits
AC
AC6 AC5 AC4 AC3 AC2 AC1 AC0
hexadecimal
hexadecimal
Please note that the DDRAM Address (ADD) is set in the Address Counter(AC) as hexadecimal.
Example: DDRAM Address “26”:
0
1
0
0
1
1
0
2
6
N=“0” 1-LINE DISPLAY, 80 CHARACTERS
Display Position
Digit
1
2
3
4
5
6
…… 79 80
DDRAM Address(hexadecimal) 00 01 02 03 04 05 …… 4E 4F
N=“0” 1-LINE DISPLAY, LESS THAN 80 CHARACTERS
In cases when there are less than 80 display characters, the display begins at the head position. For
example, if only one piece of PT6314 is being used, 24 characters are displayed. When the display
shift operation is performed, the DDRAM address shifts, please refer to the figure below.
Display Position
Digit
1
2
3
4
5
6
…… 23 24
DDRAM Address(hexadecimal) 00 01 02 03 04 05 …… 16 17
For Shift-Left
01 02 03 04 05 06 …… 17 18
For Shift-Right
4F 00 01 02 03 04 …… 15 16
N=“1” 2-LINE DISPLAY, 40 CHARACTERS
Display Position
Digit
1
2
3
4
5
6
…… 39 40
DDRAM Address
00 01 02 03 04 05 …… 26 27
(hexadecimal)
40 41 42 43 44 45 …… 66 67
PT6314 V1.3
- 15 -
March, 2006