PT6314-001L PTC [Princeton Technology Corp], PT6314-001L Datasheet - Page 17

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

Dot Character VFD Controller/Driver IC
CHARACTER GENERATOR ROM (CGROM)
The CGROM is the Read Only Memory (ROM) responsible for the generation of 5 x 8 dots character
patterns from 8-bit character codes. A total of up to 240 character patterns can be generated. Please
note that Character Codes -- 00H to 0FH are allocated to the CGRAM.
CHARACTER GENERATOR RAM (CGRAM)
The Character Generator RAM (CGRAM) allows the user to reconstruct the character patterns from
8-bit by software programming. Eight character patterns can be written and constructed using 5 x 8
dots. Areas that are not used for display purposes may be used as general data RAM.
The table below shows the relationship between the CGRAM Address, Character Code (DDRAM) and
the 5x7 (cursor included) dot character patterns (CGRAM).
D7
High Order Bit
Notes:
1. X= Irrelevant
2. Character Code Bits 0 to 2 correspond to the CGRAM Address Bits 3 to 5 (3 bits: 8 type).
3. CGRAM Address Bits 0 to 2 determine the character pattern line position. The 8th line is the cursor
4. Character pattern row position corresponds to the CGRAM data bits 0 to 4. (bit 4 is positioned at the
5. The CGRAM character patterns are selected when the character code bits 4 to 7 are all set to “0”.
6. When CGRAM Data=“1” the Display is turned ON. When CGRAM data=“0” display is turned OFF.
PT6314 V1.3
0
0
0
position and its display is formed by a logical OR with the cursor. Maintain the 8th line data,
corresponding to the cursor display position at 0 as the cursor display. If the 8th line data is “1” all
the 1 bits will light up the 8th line regardless of the cursor presence.
left)
The Character Code Bit 3 is irrelevant, the “P” Display shown above (Character Pattern No. 1) can
be selected by either character Code 00H or 07H.
D6
0
0
0
Character Code (DDRAM Data)
D5
0
0
0
D4
0
0
0
D3
X
X
X
D2
0
0
1
Low Order Bit
D1
0
0
1
D0
0
1
1
A5
High Order Bit
0
0
1
A4
0
0
1
CGRAM Address
A3
0
1
1
A2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Low Order Bit
A1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
A0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
- 17 -
D7
High Order Bit
X
X
X
D6
X
X
X
D5
X
X
X
CGRAM Data
D4
1
1
1
1
1
1
1
0
1
0
0
0
0
0
0
0
0
1
1
1
1
1
0
1
D3
1
0
0
1
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
1
1
D2
1
0
0
1
0
0
0
0
1
1
1
1
1
1
1
0
1
0
0
0
0
0
1
1
Low Order Bit
D1
1
0
0
1
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
1
1
D0
1
1
1
1
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
1
1
URL: http://www.princeton.com.tw
Character Pattern No. 1
Cursor Position
Character Pattern No. 2
Cursor Position
Character Pattern No. 8
Cursor Position
Fax: [phone]
Tel: [phone]
March, 2006
PT6314