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Dot Character VFD Controller/Driver IC
PT6314
POWER ON RESET
When PT6314 is initialized, the internal status after power supply has been reset is as follows:
1. Display Clear: 20H (space code) fills the DDRAM
2. Address Counter is set to 00H
3. Address Counter is pointed to the DDRAM
4. Display ON/OFF: D=0, C=0, B=0 (Display OFF)
5. Entry Mode Set: I/D=1, S=0 (Increment, Cursor Shifts are enabled)
6. Function Set: DL=1, N=1 (8-Bit MCU Interface, 2-Line Display are enabled.)
7. Brightness Control: BR0=BR1=0 (Brightness = 100%)
For the MCU Interface and Duty Ratio Selection, please refer to the table below.
Pin Name
TEST IFSEL DS1 DS0
Function
Remarks
0
1
1
X
0
1
X
X
X
X
X
X
Self Test Mode
Serial Interface
Parallel Interface
Duty=1/16
This is effective specially after long usage.
SI/SO, SCK, STB
RS, E, R/W, DB7 to DB4 or DB7 to DB0
1
1
1
1
X
X
X
X
0
0
1
1
0
1
0
1
(16Cx1 or 2L Display)
It does not need to use the extension driver.
The number of display lines is selected by
instruction.
Duty=1/20
(20Cx1 or 2L Display)
Duty=1/24
(24Cx1 or 2L Display)
Duty=1/40
(40Cx1 or 2L Display)
Extension driver must be used. The number
of display lines is selected by instruction.
The above table shows the relationship between the status of PT6314 and the pin states during
RESET.
PT6314 V1.3
- 31 -
March, 2006
PTC [ PRINCETON TECHNOLOGY CORP ]
