HCS361_11 Datasheet, PDF (13/42 Pages) Microchip Technology – KEELOQ® Code Hopping Encoder incorporates high security,

HCS361
FIGURE 4-2:
VPWM TRANSMISSION FORMAT (MOD = 1)
VPWM TRANSMISSION SEQUENCE:
WAKE-UP (TXWAK=1)
Dead Time
1st CODE WORD
Preamble Header Encrypt Fixed
Guard Preamble Header Encrypt
WAKE-UP:
TE
TBP
TBP
1
33% Duty Cycle Wake-Up sequence 250xTE
84
Dead Time 258xTE
VPWM BIT ENCODING:
LOGIC 0
TE
on Transition Low to High
on Transition High to Low
TBP
2XTE
LOGIC 0
TE
LOGIC 1
TBP
LOGIC 1
TE
CODE WORD:
TBP
1
6
10
SPM=1
TBP
TBP
2XTE
18xTE Preamble
SPM=0
10xTE Sync 10xTE Header Encrypted Portion
Pulse
Code Word
Fixed Code Portion
Guard
Time
© 2011 Microchip Technology Inc.
DS40146F-page 13