HCS361-IP Microchip Technology, HCS361-IP Datasheet - Page 11

• Manufacturer Part Number: HCS361-IP
• Description: KEELOQ CODE HOPPING ENCODER
• Manufacturer: Microchip Technology

FIGURE 4-2:
FIGURE 4-3:
1996 Microchip Technology Inc.
(2 bit)
TOTAL TRANSMISSION:
CRC
CODE WORD:
TRANSITION
(2 bit)
WAKEUP (OPTION)
CRC
•
(1 bit)
Preamble
V
LOW
TRANSMISSION FORMAT—VPWM = 1
CODE WORD ORGANIZATION (RIGHT-MOST BIT IS CLOCKED-OUT FIRST)
V
Fixed Code Data
LOGIC "0"
T
LOW
bit
E
(4 bits)
x84
Button
Dead Time
Status
Te
+
Te
SPM=1
SPM=0
LOGIC "1"
Preamble Sync Encrypt
Serial Number
Button Status (32 bits)
Serial Number and
28-bit
Code Word
Header
Preliminary
1 CODE WORD
LSB
(4 bits)
Button
Status
MSB
Encrypted
Fixed
Data
+
Discrimination
Encrypted Code Data
MSB
(12 bits)
32 bits of Encrypted Data
Guard
bits
Preamble Sync Encrypt
Fixed Code
Data
Synch Value
16-bit
LSB
HCS361
DS40146C-page 11
67 bits
of Data
Transmitted
Guard
Time