HCMS-39X2 HP [Agilent(Hewlett-Packard)], HCMS-39X2 Datasheet - Page 14

• Manufacturer Part Number: HCMS-39X2
• Description: 3.3 V High Performance CMOS 5x7 AlphaNumeric Displays
• Manufacturer: HP [Agilent(Hewlett-Packard)]

Control Register Data Loading
Data is loaded into the Control
Register, MSB first, according to
the procedure shown in Table 1
and Figure 5. First, RS is brought
to logic high and then CE is
brought to logic low. Next, each
successive rising CLK edge will
shift in the data on the D
Finally, when 8 bits have been
loaded, the CE line is brought to
logic high. When CLK goes to
logic low, new data is copied into
the selected control word.
Loading data into the Control
Register takes place while the
previous control word configures
the display.
14
IN
pin.
Control Word 0
Loading the Control Register with
D
Word 0 (see Table 2). Bits D
adjust the display brightness by
pulse width modulating the LED
on time, while Bits D
the display brightness by
changing the peak pixel current.
Bit D
or sleep mode.
Sleep mode (Control Word 0, bit
D
Display Oscillator and the LED
pixel drivers. This mode is used
when the IC needs to be powered
up, but does not need to be
7
6
= Logic low selects Control
= Low) turns off the Internal
6
selects normal operation
4
-D
5
adjusts
0
-D
3
active. Current draw in sleep
mode is nearly zero. Data in the
Dot Register and Control Words
are retained during sleep mode.
Control Word 1
Loading the Control Register with
D
Word 1. This Control Word
performs two functions: serial/
simultaneous data out mode and
external oscillator prescale select
(see Table 2).
7
= logic high selects Control