PT6314_10 Datasheet, PDF (26/42 Pages) Princeton Technology Corp – Dot Character VFD Controller/Driver IC

PT6314
6.6 “FUNCTION SET” INSTRUCTION
RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
CODE 0
0
0
0
1
DL
N
X
BR1 BR0
The instruction above sets the data length of the data bus lines. This instruction initializes the system, and must be the
first instructed executed after power is turned ON.
The “DL” and “N” settings are described below:
“DL”=”1”: 8-bit MCU Interface using DB7 to DB0
“DL”=”0”: 4-bit MCU Interface using DB7 to DB4
“N”=”0”: 1-Line Display using SG1 to SG40. (SG41 to SG80 are fixed at “Low Level”)
“N”=”1”:2-Line Display using SG1 to SG80
x = Not Relevant
BR1 and BR0 flags are used to modulate the pulse width of the Segment Output thereby controlling the VFD brightness.
BR1
BR0
Brightness
tp
0
0
100%
tDSP x 1.00
0
1
75%
tDSP x 0.75
1
0
50%
tDSP x 0.5
1
1
25%
tDSP x 0.25
tDSP≒200μs, tBLK≒10μs
where n = number of Grid, T =n x (tDSP + tBLK)
During Reset,
DB7 DB6 DB5
0
0
1
DB4
1
DB3
1
DB2
0
DB1
0
DB0
0
V1.5
26
October 2009