PT6302_10 Datasheet, PDF (14/27 Pages) Princeton Technology Corp – VFD Driver/Controller IC with Character RAM

PT6302
DISPLAY DUTY SET COMMAND
The Display Duty Set Command is used to write the display duty value to the duty cycle register. Using a 3-bit data, the
display duty adjusts the contrast in 8 stages. When the power is turned ON or when the RSTB signal is inputted, the duty
cycle register value is set to "0". It is advisable to always execute this command before turning on the display, after which
the desired duty value may be set. The command format is given below.
LSB
MSB
1st Byte _{B0 B1 B2 B3 B4 B5 B6 B7} Display Duty Set Mode is selected and the duty value
D0 D1 D2
*
1
0
1
0 ^{is specified.}
where:
1. D0 (LSB) to D2 (MSB): Display duty data bits (8 stages)
2. *=Not relevant
The Relationship between the Setup Data and the Controlled GRID Duty is given in the table below.
HEX D2 D1 D0 GRID Duty
0
0
0
0
8/16
1
0
0
1
9/16
The state when the Power is turned ON or when
the RSTB signal is inputted
2
0
1
0
10/16
3
0
1
1
11/16
4
1
0
0
12/16
5
1
0
1
13/16
6
1
1
0
14/16
7
1
1
1
15/16
NUMBER OF DIGITS SET COMMAND
The Number of Digits Set Command is used to write the number of display digits into the display digit register. Using a
3-bit data, the Number of Digits Set Command can display 9 to 16 digits. When the power is turned ON or when the
RSTB signal is inputted, the value is set to "0". It is advisable to always execute this command before the turning on the
display. The command format is given below.
LSB
MSB
1st Byte _{B0 B1 B2 B3 B4 B5 B6 B7} The Number of Digits Set Mode is selected and the
K0 K1 K2 *
0
1
1
0 ^{number of digit value is specified.}
The table below shows the relationship between the setup data and the controlled GR.
HEX K2 K1 K0
0
0
0
0
1
0
0
1
Number of Digits of GR
GR1 ~ GR16
GR1 ~ GR9
The state when the Power is turned ON or
when the RSTB signal is inputted.
2
0
1
0
GR1 ~ GR10
3
0
1
1
GR1 ~ GR11
4
1
0
0
GR1 ~ GR 12
5
1
0
1
GR1~ GR13
6
1
1
0
GR1~ GR14
7
1
1
1
GR1~ GR15
V2.1
14
August 2010