MAX6850 MAXIM [Maxim Integrated Products], MAX6850 Datasheet - Page 31

• 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 38. PHASE1 Register Format
Table 39. PHASE2 Register Format
Table 40. PUMP Register Format
The BLINK output is the selectable blink period clock. It
is nominally 0.5Hz or 1Hz (OSC = 4MHz). It is low dur-
ing the first half of the blink period, and high during the
second half. The PORT0 and PORT1 general-purpose
outputs may be programmed to be BLINK output.
Synchronize the BLINK timing if desired by setting the
T bit in the configuration register (Table 21).
General-purpose output, logic 0.
This is the power-up condition.
General-purpose output, logic 1.
Output gives blink status:
zero if blink phase P0; 1 if blink phase P1.
Filament drive PHASE1 (logic 0 during
shutdown).
General-purpose output, logic 0.
This is the power-up condition.
General-purpose output, logic 1.
Output gives blink status: 0 if blink phase P0;
1 if blink phase P1.
Filament drive PHASE2 (logic 0 during
shutdown).
General-purpose output, logic 0.
This is the power-up condition.
General-purpose output, logic 1.
80kHz square-wave output (OSC = 4MHz)
(logic 0 during shutdown).
DOUT output.
numeric Vacuum-Fluorescent Display Controller
PUMP PORT BEHAVIOR
PHASE1 BEHAVIOR
PHASE2 BEHAVIOR
______________________________________________________________________________________
COMMAND
ADDRESS
COMMAND
COMMAND
ADDRESS
ADDRESS
0x08
0x08
0x08
0x08
0x0A
0x0A
0x0A
0x0A
0x0B
0x0B
0x0B
0x0B
D7
X
X
X
X
D7
D7
X
X
X
X
X
X
X
X
The RC oscillator uses an external resistor R
an external capacitor C
quency. R
connects from OSC1 to ground. The recommended val-
ues of R
which makes the BLINK frequencies 0.5Hz and 1 Hz:
where:
K
F
D6
X
X
X
X
= 2320
D6
D6
X
X
X
X
X
X
X
X
f
OSC
D5
X
X
X
X
D5
OSC
D5
X
X
X
X
X
X
X
X
OSC
REGISTER DATA
= K
REGISTER DATA
REGISTER DATA
D4
and C
F
X
X
X
X
D4
D4
connects from OSC2 to ground. C
X
X
X
X
X
X
X
X
/ (R
OSC
D3
OSC
D3
X
X
X
X
D3
X
X
X
X
X
X
X
X
x [C
OSC
set the oscillator to 4MHz,
D2
D2
D2
X
X
X
X
X
X
X
X
X
X
X
X
OSC
to set the oscillator fre-
D1
D1
+ C
D1
0
0
1
1
0
0
1
1
0
0
1
1
STRAY
D0
D0
D0
0
1
0
1
0
1
0
1
0
1
0
1
]) MHz
HEX CODE
HEX CODE
HEX CODE
OSC
0xX0
0xX1
0xX2
0xX3
0xX0
0xX1
0xX2
0xX3
0xX0
0xX1
0xX2
0xX3
OSC
and
31