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Dot Character VFD Controller/Driver IC
PT6314
“FUNCTION SET” INSTRUCTION
RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
DL BR1 BR0
CODE
0
0
0
0
1
N
X
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
100%
75%
tp
0
0
1
1
0
1
0
1
tDSP x 1.00
tDSP x 0.75
tDSP x 0.5
tDSP x 0.25
50%
25%
tDSP≒200µs, tBLK≒10µs
T
tDSP
tp
tBLK
tBLK
SGn
G1
Gn
where n = number of Grid, T =n x (tDSP + tBLK)
During Reset,
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
1
1
1
0
0
0
PT6314 V1.3
- 28 -
March, 2006
PTC [ PRINCETON TECHNOLOGY CORP ]
