Wireless Security Remote Control Development Kit User’s Guide
In the event no KEELOQ Classic packet from an unknown transmitter is received within
18 seconds, the KEELOQ Classic learn mode will time out and display the message
“Learn mode timeout” on the LCD, as shown in Figure 2-5.
FIGURE 2-5:
LEARN MODE TIMEOUT
The known transmitters and their latest counters are stored in the Nonvolatile Memory
(NVM) space of the microcontroller. When all slots in the NVM space for transmitters
are taken, the learning process will fail. Pressing and holding button SW3 for a few
seconds will erase all transmitter records from the NVM, and then the display message
“Memory Erased” on the LCD, as shown in Figure 2-6.
FIGURE 2-6:
ERASE TRANSMITTER RECORDS FROM MEMORY
When a KEELOQ Classic packet is received from a known transmitter, the contents of
the packet is displayed on the LCD, as shown in Figure 2-7. The following information
from the KEELOQ Classic packet are available:
• Encoder: KLQ that represents KEELOQ Classic
• Serial number of the transmitter: 28-bit serial number (according to Figure 2-7) in
this transmission
• Counter: 16-bit number (according to Figure 2-7) in this transmission
• Function Code: A bitmap of the pressed buttons (it will be 3 if both KLQ buttons
are pressed), depending on the button pressed on the key fob
FIGURE 2-7:
KEELOQ PACKET INFORMATION
DS41646A-page 18
2012 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
