MAX6850 Ver la hoja de datos (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 1. Display Modes
DISPLAY
MODE
48/1 mode
96/2 mode
MAXIMUM NO. OF DIGITS
48 digits, each with a DP segment and a cursor
segment
96 digits, each with a DP segment and a cursor
segment
MAXIMUM NO. OF
ANNUNCIATORS
4 per digit
None
MAXIMUM NO.
OF GRIDS
48 grids
DIGITS COVERED
BY EACH GRID
1 digit per grid
2 digits per grid
Table 2. Register Address Map
REGISTER
No-Op
VFBLANK polarity
Intensity
Grids
Configuration
User-defined fonts
Output map
Display test and device ID
PUMP register
Filament duty cycle
PHASE1
PHASE2
PORT0
PORT1
Shift limit
Cursor
Factory reserved. Do not write to register.
COMMAND ADDRESS
D15 D14 D13 D12 D11 D10 D9 D8
HEX
CODE
R/W
0
0
0
0
0
0
0
0x00
R/W
0
0
0
0
0
0
1
0x01
R/W
0
0
0
0
0
1
0
0x02
R/W
0
0
0
0
0
1
1
0x03
R/W
0
0
0
0
1
0
0
0x04
R/W
0
0
0
0
1
0
1
0x05
R/W
0
0
0
0
1
1
0
0x06
R/W
0
0
0
0
1
1
1
0x07
R/W
0
0
0
1
0
0
0
0x08
R/W
0
0
0
1
0
0
1
0x09
R/W
0
0
0
1
0
1
0
0x0A
R/W
0
0
0
1
0
1
1
0x0B
R/W
0
0
0
1
1
0
0
0x0C
R/W
0
0
0
1
1
0
1
0x0D
R/W
0
0
0
1
1
1
0
0x0E
R/W
0
0
0
1
1
1
1
0x0F
X
0
0
1
0
0
0
0
0x10
Character Registers
The MAX6850 uses 48 character registers (48/1 mode)
(Table 4) or 96 character registers (96/2 mode) (Table
5) to store the 7-, 14-, and 16-segment characters
(Table 6). Each digit is represented by 1 byte of memo-
ry. The data in the character registers does not control
the character segments directly. Instead, the register
data is used to address a character generator, which
stores the data of the 128-character font (Table 7). The
lower 7 bits of the character data (D6 to D0) select a
character from the font table. The most significant bit
(MSB) of the register data (D7) controls the DP seg-
ment of the digit; it is set to light the DP, cleared to
leave it unlit.
The character registers address maps are shown in
Table 4 (48/1 mode) and Table 5 (96/2 mode).
In 48/1 mode, the character registers use a single
address range 0x20 to {0x20 + g}, where g is the value
in the grids register (Table 26). The 48/1 mode upper
address limit, when g is 0x2F, is therefore 0x4F. The
address range 0x50 to 0x7F is used for annunciator
data in 48/1 mode.
In 96/2 mode, the character registers use two address
ranges. The first row’s address range is 0x20 to
{0x20 + g}. The second row’s address range is 0x50 to
{0x50 + g}. Therefore, in 96/2 mode, the character reg-
isters are only one contiguous memory range when a
48-grid display is used.
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