PT6314-001L PTC [Princeton Technology Corp], PT6314-001L Datasheet - Page 15

• Manufacturer Part Number: PT6314-001L
• Description: Dot Character VFD Controller/Driver IC
• Manufacturer: PTC [Princeton Technology Corp]

Dot Character VFD Controller/Driver IC
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.
Please note that the DDRAM Address (ADD) is set in the Address Counter(AC) as hexadecimal.
Example: DDRAM Address “26”:
N=“0” 1-LINE DISPLAY, 80 CHARACTERS
Display Position
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
N=“1” 2-LINE DISPLAY, 40 CHARACTERS
Display Position
PT6314 V1.3
Digit
DDRAM Address(hexadecimal) 00
Digit
DDRAM Address(hexadecimal) 00
For Shift-Left
For Shift-Right
Digit
DDRAM Address
(hexadecimal)
AC
0
2
High Order Bits
AC6
hexadecimal
1
AC5
0
1
1
01
4F
1
00
40
AC4
0
6
2
01
2
01
02
00
2
01
41
- 15 -
Low Order Bits
AC3
hexadecimal
1
3
02
3
02
03
01
3
02
42
4
03
4
03
04
02
4
03
43
AC2
1
5
04
5
05
03
5
04
44
04
AC1
0
05
06
04
6
6
05
6
05
45
URL: http://www.princeton.com.tw
AC0
……
……
……
……
……
……
……
……
……
79
4E
23
16
17
15
39
26
66
Fax: [phone]
Tel: [phone]
March, 2006
PT6314
80
4F
24
17
18
16
40
27
67