HCS410_11 MICROCHIP [Microchip Technology], HCS410_11 Datasheet - Page 12
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HCS410_11
Manufacturer Part Number
HCS410_11
Description
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.HCS410_11.pdf
(46 pages)
- Current page: 12 of 46
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HCS410
2.3.9
The S2/LED line can be used to drive a LED when the
HCS410 is transmitting. If this option is enabled in the
configuration word the S2 line is driven high periodi-
cally when the HCS410 is transmitting as shown in
Figure 2-14. The LED output operates with a 30 ms on
and 480 ms off duty cycle when the supply voltage is
above the level indicated by the V
uration word. When the supply voltage drops below the
voltage indicated by the VLOW bit the HCS410 will indi-
cate this by turning the LED on for 200ms at the start of
a transmission and remain off for the rest of the trans-
mission.
2.3.10
The HCS410 has a delayed increment feature that
increments the counter by 12, 20 seconds after the last
button press occurred. The 20-second time-out is reset
and the queue counter will increment if another press
occurs before the 20 seconds expires. The queue
counter is cleared after the buttons have been released
for more than 2 seconds. Systems that use this feature
will circumvent the latest jamming-code grabbing
attackers.
FIGURE 2-14: LED INDICATION DURING TRANSMISSION
DS40158F-page 12
S Input
V
V
DD
DD
= V
< V
LED
LED
LED OUTPUT
DELAYED INCREMENT
LOW
LOW LEVEL
Level
200 ms
LOW
bit in the config-
200 ms
2.3.11
Other configurable code hopping options include an
• Transmission-rate selection
• Extended serial number.
These are described in more detail in Section 3.7.
480 ms
OTHER CONFIGURABLE OPTIONS
© 2011 Microchip Technology Inc.
30 ms
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