LSQ976-NR-1-0-20-R18 datasheet(18/50 Pages) MICROCHIP

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Wireless Security Remote Control Development Kit User’s Guide

DS41646A-page 18

 2012 Microchip Technology Inc.

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

LSQ976-NR-1-0-20-R18 데이터시트(PDF) 18 Page - Microchip Technology