HCS370 Datasheet, PDF (7/36 Pages) Microchip Technology – KEELOQ Code Hopping Encoder

FIGURE 2-4: BASIC FLOW DIAGRAM OF
THE DEVICE OPERATION
START
Sample Buttons
Get Config
Seed
Yes
TX?
No
Increment
Counter
Read
Seed
Encrypt
Transmit
Time
Yes
Out
No
No
MTX
STOP
Yes
No
Buttons
Yes
No
Seed ^Yes Seed
Yes
Time
Button
No
No
No
New
Buttons
Yes
2002 Microchip Technology Inc.
Preliminary
HCS370
DS41111D-page 7