hcs361 Microchip Technology Inc., hcs361 Datasheet - Page 23

• Manufacturer Part Number: hcs361
• Description: Keeloq Code Hopping Encoder
• Manufacturer: Microchip Technology Inc.

FIGURE 8-2:
FIGURE 8-3:
FIGURE 8-4:
Header
2002 Microchip Technology Inc.
TXWAK=0
TXWAK=1
CODE WORD:
Bit 0
LSB
1
Encrypted Portion
of Transmission
Bit 1
T
33% Duty Cycle
18xT
BP
E
PWM FORMAT SUMMARY (MOD = 0)
PWM PREAMBLE/HEADER FORMAT (MOD=0)
PWM DATA FORMAT (MOD=0)
Preamble
Bit 30 Bit 31 Bit 32 Bit 33
28xT
MSB
E
6
Preamble
LSB
10xT
SPM=1
SPM=0
Pulse
E
Serial Number
Sync
10
10xT
Bit 58 Bit 59
E
Header
MSB
Code Word
Fixed Portion of Transmission
Duty Cycle: 1/3-2/3
(TXWAK=0)
Duty Cycle: 1/6-2/6
(TXWAK=1)
10xT
Bit 60 Bit 61 Bit 62 Bit 63 Bit 64 Bit 65
SPM = 1
SPM = 0
S3
Encrypted Portion
E
Sync Pulse
Function Code
S0
S1
S2
LOGIC 0
T
LOGIC 0
Fixed Code Portion
BP
T
=3
BP
Status
V
10xT
LOW
X
T
E
E
CRC0 CRC1
Header
HCS361
CRC
T
DS40146E-page 23
E
T
E
Bit 66
LOGIC 1
T
T
LOGIC 1
BP
BP
Guard
Time
Guard
Time