MAX6850 MAXIM [Maxim Integrated Products], MAX6850 Datasheet - Page 15

• Manufacturer Part Number: MAX6850
• Description: 4-Wire Interfaced, 7-, 14-, and 16-Segment Alphanumeric Vacuum-Fluorescent Display Controller
• Manufacturer: MAXIM [Maxim Integrated Products]

4-Wire Interfaced, 7-, 14-, and 16-Segment Alpha-
Table 11. User-Definable Font Pointer Addresses (continued)
The S bit in the configuration register selects shutdown
or normal operation (Table 17). The display driver can
be programmed while in shutdown mode, and shut-
down mode is overridden when in display test mode.
For normal operation, set S bit to 1.
When the MAX6850 is in shutdown mode, the multiplex
oscillator is halted at the end of the current 100µs multi-
plex period (OSC = 4MHz), and the VFBLANK output is
used to disable the VFD tube driver. Data in the digit
and other control registers remain unaltered.
If the PUMP output is configured as a square-wave
clock, then the PUMP output is forced low for the dura-
CHARACTER
RAM10 byte 1
RAM11 byte 0
RAM11 byte 1
RAM12 byte 0
RAM12 byte 1
RAM13 byte 0
RAM13 byte 1
RAM14 byte 0
RAM14 byte 1
RAM15 byte 0
RAM15 byte 1
RAM16 byte 0
RAM16 byte 1
RAM17 byte 0
RAM17 byte 1
RAM18 byte 0
RAM18 byte 1
RAM19 byte 0
RAM19 byte 1
RAM20 byte 0
RAM20 byte 1
RAM21 byte 0
RAM21 byte 1
RAM22 byte 0
RAM22 byte 1
RAM23 byte 0
RAM23 byte 1
numeric Vacuum-Fluorescent Display Controller
FONT
Shutdown Mode (S Data Bit D0) Format
DEFAULT (BIN)
POWER-UP
______________________________________________________________________________________
000 0000
001 1111
000 0000
100 1110
000 0000
011 1101
000 0000
100 1111
000 0000
100 0111
000 0000
000 1101
000 0000
001 0101
000 0000
111 0110
000 0000
001 1101
000 0000
000 0101
000 0000
100 1111
000 0000
001 1100
000 0000
011 1011
000 0000
CHARACTER
7-segment B
7-segment C
7-segment D
7-segment N
7-segment E
7-segment F
7-segment c
7-segment n
7-segment o
7-segment u
7-segment y
POWER-UP
7-segment r
7-segment t
—
—
—
—
—
—
—
—
—
—
—
—
—
—
COMMAND
ADDRESS
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
tion of shutdown, and the square-wave clock restored
when the MAX6850 comes out of shutdown.
If the PHASE1 output or PHASE2 output is configured as
a filament driver, then that output is forced low for the
duration of shutdown and the filament drive waveforms
restored when the MAX6850 comes out of shutdown.
When the MAX6850 comes out of shutdown, the exter-
nal VFD tube driver is presumed to contain invalid data.
The VFBLANK output is used to disable the VFD tube
driver for the first multiplex cycle after exiting shutdown,
clearing any invalid data. The next multiplex cycle uses
newly sent valid data.
REGISTER
DATA
0xAA
0xAB
0xAC
0xAD
0x9A
0x9B
0x9C
0x9D
0xA0
0xA1
0xA2
0xA3
0xA4
0xA5
0xA6
0xA7
0xA8
0xA9
0xAE
0xAF
0x95
0x96
0x97
0x98
0x99
0x9E
0x9F
D7
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
D6
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
D5
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
REGISTER DATA
D4
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D3
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
D2
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
D1
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
D0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
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