HCS361_11 Datasheet, PDF (28/42 Pages) Microchip Technology – KEELOQ® Code Hopping Encoder incorporates high security,

HCS361
FIGURE 9-5:
VPWM FORMAT SUMMARY (MOD = 1)
WAKE-UP (TXWAK=1)
Dead Time
1st CODE WORD
Preamble ^Sync Encrypt ^Fixed
Guard _Preamble Sync _Encrypt
FIGURE 9-6:
VPWM WAKE-UP FORMAT (MOD=1)
TBP
1
33% Duty Cycle Wake-Up sequence 250xTE
84
Dead Time 258xTE
FIGURE 9-7:
TBP
1
VPWM PREAMBLE/HEADER FORMAT (MOD=1)
6
10
SPM=1
18xTE Preamble
SPM=0
10xTE Sync 10xTE Header Encrypted Portion
Pulse
Code Word
Fixed Code Portion
Guard
Time
FIGURE 9-8:
VPWM DATA WORD FORMAT (MOD=1)
LOGIC 0
TE
LOGIC 1
on Transition Low to High
on Transition High to Low
TBP
2XTE
LOGIC 0
TE
TBP
LOGIC 1
TE
TBP
TBP
Encrypted Data
Serial Number
VLOW
Function Code
CRC
10 0 1
101 1 10 0 1
10 0 1 10 0 1 101
Bit ^{0 1 2 3}
28 29 30 31 32 33 34 35
56 57 58 59 60 61 62 63 64 65 66
Note: The bit values are only shown as an example.
DS40146F-page 28
© 2011 Microchip Technology Inc.