MAX6850 데이터 시트보기 (PDF) - Maxim Integrated
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MAX6850 Datasheet PDF : 34 Pages
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4-Wire Interfaced, 7-, 14-, and 16-Segment Alpha-
numeric Vacuum-Fluorescent Display Controller
Table 3. Initial Power-Up Register Status
REGISTER
VFBLANK polarity
Intensity
Grids
Configuration
User-defined font
address pointer
User-defined fonts
Output map pointer
Output map data
Display test
PUMP
Filament duty cycle
PHASE1
PHASE2
PORT0
PORT1
Shift limit
Cursor
Character and
annunciator data
UP TO
Character and
annunciator data
POWER-UP CONDITION
COMMAND
REGISTER DATA
ADDRESS D7 D6 D5 D4 D3 D2 D1 D0
VFBLANK is high to disable the
display
1/16 (min on)
Display has 1 grid
0x01
0x02
0x03
X
X
X
X
X
X
0
0
X
X
X
X
0
0
0
0
X
X
0
0
0
0
0
0
Shutdown enabled,
configuration unlocked
0x04
1
0
0
0
0
0
0
0
Address 0x80; pointing to the
first user-defined font location
0x05
1
0
0
0
0
0
0
0
Predefined for hex fonts
—
See Table 11 for power-up patterns.
Address 0x80; pointing to the
first entry address
0x06
1
0
0
0
0
0
0
0
Predefined for 40-digit display
Normal operation
General-purpose output, logic
Minimum duty cycle
General-purpose output, logic
General-purpose output, logic
General-purpose output, logic
General-purpose output, logic
1 output bit
Off
—
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
See Table 32 for power-up patterns.
X
X
X
X
X
X
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
X
0
0
0
0
0
0
1
0
1
1
0
0
0
0
0
Clear
0x20
0
0
0
0
0
0
0
0
—
UP TO
————————
Clear
0x7F
0
0
0
0
0
0
0
0
Character Generator Font Mapping
The font comprises 104 characters in ROM, and 24
user-definable characters. The selection from the total
of 128 characters is represented by the lower 7 bits of
the 8-bit digit registers. The MSB, shown as X in the
ROM maps (Tables 7 and 8), controls the DP segment
of the digit; it is set to light the DP.
There are two font maps stored in the MAX6850. One
font map covers 14-segment displays (Table 8), and
the other suits 16-segment displays (Table 7). The F bit
in the configuration register (Table 20) selects between
the two font maps. The F bit may be set either high or
low for 7-segment displays; 7-segment displays use a
subset of the 14- or 16-segment display described in
two font maps (Figure 7).
7 SEGMENT
a
f
b
g
MAPS TO
e
c
dp
d
14/16 SEGMENT
a/a1
f
b
g1
e
c
dp
d/d2
Figure 7. 14- and 16-Segment Fonts Map a Subset of Their 14
or 16 Segments to a 7-Segment Digit
10 ______________________________________________________________________________________
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