HDLX-3461 HP [Agilent(Hewlett-Packard)], HDLX-3461 Datasheet - Page 9

• Manufacturer Part Number: HDLX-3461
• Description: Four Character 6.9 mm (0.27 inch) Smart 5 x 7 Alphanumeric Displays
• Manufacturer: HP [Agilent(Hewlett-Packard)]

0 = Logic 0; 1 = Logic 1; X = Do Not Care
Figure 2. Display Truth Table.
Display Clear
Data stored in the Character
RAM, Control Register, and
Attribute RAM will be cleared if
the clear (CLR) is held low for a
minimum of 10 s. Note that the
display will be cleared regardless
of the state of the chip enables
(CE
cleared, the ASCII code for a
space (20hex) is loaded into all
character RAM locations and
00hex is loaded into all Attribute
RAM/Control Register memory
locations.
Data Entry
Figure 2 shows a truth table for
the HDLX-3416 display. Setting
the chip enables (CE
logic 0 and the cursor select (CU)
to logic 1 will enable ASCII data
loading. When cursor select (CU)
CUE
0
1
X
X
X
X
X
1
, CE
BL
X
X
X
X
1
1
0
2
). After the display is
CLR
1
1
0
1
1
1
1
CE
X
X
X
0
0
1
1
1
, CE
CE
X
X
X
0
0
1
2
2
) to
WR
X
0
0
X
X
1
CU
X
X
0
0
0
0
1
1
1
1
is set to logic 0, data will be
loaded into the Control Register
and Attribute RAM. Address
inputs A
digit location in the display. Data
inputs D
information into the display. Data
will be latched into the display on
the rising edge of the WR signal.
D
must be held stable during the
write cycle to ensure that correct
data is stored into the display.
Data can be loaded into the
display in any order. Note that
when A
is stored in the right most display
location.
Cursor
When cursor enable (CUE) is a
logic 1, a cursor will be displayed
in all digit locations where a logic
A
X
0
0
1
1
0
0
1
1
X
0
1
-D
6
, A
A
X
X
0
1
0
1
0
1
0
1
0
0
0
0
0
and A
Functions
-A
-A
Extended
-D
Enabled
Disable
Disable
Enable
Always
D
D
0 =
1 =
D
D
1
1
1
1
X
X
6
-D
-D
, CE
6
0
are used to select the
are used to load
5
5
1
are logic 0, data
1
, CE
D
X
X
Digit 0 ASCII Data (Right Most Character)
Digit 1 ASCII Data
Digit 2 ASCII Data
Digit 3 ASCII Data (Left Most Character)
5
000 = 100%
001 = 060%
010 = 040%
011 = 027%
100 = 017%
101 = 010%
110 = 007%
111 = 003%
Intensity
2
Control
, and CU
D
X
X
4
D
X
X
3
Blanked
Display
Display
Master
Blank
0 =
1 =
ON
D
X
X
2
9
1 has been stored in the Digit
Cursor memory in the Attribute
RAM. The cursor consists of all
35 dots ON at half brightness. A
flashing cursor can be displayed
by pulsing CUE. When CUE is a
logic 0, the ASCII data stored in
the Character RAM will be dis-
played regardless of the Digit
Cursor bits.
Blanking
Blanking of the display is con-
trolled through the BL input, the
Control Register, and Attribute
RAM. The user can achieve a
variety of functions by using these
controls in different combinations,
such as full hardware display
blank, software blank, blanking of
individual characters, and syn-
chronized flashing of individual
characters or entire display (by
Disable 0
Disable 1
Disable 2
Disable 3
Blank
Blank
Blank
Blank
Digit
Digit
Digit
Digit
D
X
X
1
Cursor
Cursor
Cursor
Cursor
Digit
Digit
Digit
Digit
D
X
X
0
1
2
3
0
Function
Display ASCII
Display Stored Cursor
Reset RAMs
Blank Display but do not reset
RAMs and Control Register
Write to Attribute RAM
and Control Register
DBD n = 0, Allows Digit n to be
blanked
DBD n = 1 Prevents Digit n
from being blanked.
DC n = 0 Removes cursor from
Digit n
DC n = 1 Stores cursor at
Digit n
Write to Character RAM
No Change