HCS301-IP Microchip Technology, HCS301-IP Datasheet - Page 8

• Manufacturer Part Number: HCS301-IP
• Description: KEELOQ CODE HOPPING ENCODER
• Manufacturer: Microchip Technology

HCS301
FIGURE 4-1:
FIGURE 4-2:
FIGURE 4-3:
FIGURE 4-4:
DS21143A-page 8
PWM
S2(S3)
S[1:0]
Reserved
16
Repeat
(1 bit)
1 bit of Status
CODE WORD TRANSMISSION FORMAT
CODE WORD ORGANIZATION
SYNCHRONOUS TRANSMISSION MODE
TRANSMISSION WORD FORMAT DURING SYNCHRONOUS TRANSMISSION MODE
(1 bit)
1 bit Fixed
V
LOW
Preamble
Padding
2
T
Period
P
Fixed Code Data
Bit
“01,10,11”
(4 bits)
Button
Status
Button
Code
4
t = 50 ms
LOGIC ‘0’
LOGIC ‘1’
+
Header
T
Serial Number
Button Status (32 bits)
H
Serial Number and
28-bit
Serial Number
Preliminary
Encrypted Portion
of Transmission
28
T
HOP
(4 bits)
Button
Status
+
Encrypted Code Data
Discrimina-
32 bits of Encrypted Data
Fixed Portion of
Transmission
(12 bits)
tion bits
Data Word
T
FIX
16
1996 Microchip Technology Inc.
Sync Value
Transmission Direction
16-bit
Guard
Time
Sync Counter
T
G
16
66 bits
of Data
Transmitted