LSQ976-NR-1-0-20-R18 datasheet(19/50 Pages) MICROCHIP

19 / 50 page

Getting Started

 2012 Microchip Technology Inc.

DS41646A-page 19

2.5.2.2

KEELOQ AES

For KEELOQ AES, there is no requirement that a transmitter must be known to the

receiver before a packet can be accepted, so there is no learning process for a packet

that is encoded with KEELOQ AES cipher. When a KEELOQ AES packet is received, the

contents of the packet is displayed on the LCD, as shown in Figure 2-8. The following

information from the KEELOQ AES packet are available:

• Encoder: AES that represents KEELOQ AES

• Serial number of the transmitter: 32-bit serial number (according to Figure 2-8) in

this transmission

• Counter: 32-bit counter (according to Figure 2-8) in this transmission

• Function Code: A bitmap of pressed buttons, depending on the button pressed on

the key fob

FIGURE 2-8:

2.6

EMBEDDED SECURITY DEVELOPMENT BOARD HARDWARE SELF-CHECK

A hardware self-check can be performed to ensure the hardware integrity of the

Embedded Security Development Board. The instruction of the hardware self-check is

displayed on the LCD. The test result is either checked by firmware and display on the

LCD, or verified by user observation.

To initiate the hardware self-check, press and hold push button SW1 before powering

up the Embedded Security Development Board. SW1 can then be released when

“HDW Self Tests” is displayed on the LCD screen. Four individual hardware self-tests

will then be performed one by one.

2.6.0.1

BUTTON TESTS

“Button Test” will be displayed on the first line of the LCD display. Test instructions of

pressing individual buttons will be displayed on the second line of the LCD display.

Once a required push button is pressed, the test instruction message will be changed

for the next push button. Once all push buttons have been tested, SW1 needs to be

pressed to move forward to the LED test.

2.6.0.2

LED TESTS

There are two sets, ten LEDs, which can be controlled by the host and target

application microcontroller separately. When LED tests start, the message “LEDs

Flashing

” will be displayed on the first line of the LCD display. During the tests, two

sets of LEDs will be flashing separately, while LEDs from the same set should be

flashing together. The user should observe that all LEDs are turned on and off with

flashing intervals of roughly one second. Once the user has verified the LED test, SW1

needs to be pressed to move forward to the RTCC test.

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