參數(shù)資料
型號: HCS320
廠商: Microchip Technology Inc.
英文描述: KEELOQ Code Hopping Encoder
中文描述: 而Keeloq跳碼編碼器
文件頁數(shù): 9/32頁
文件大?。?/td> 435K
代理商: HCS320
2001 Microchip Technology Inc.
DS41097C-page 9
HCS320
4.0
TRANSMITTED WORD
4.1
Code Word Format
The HCS320 code word is made up of several parts
(Figure 4-1). Each code word contains a 50% duty
cycle preamble, a header, 32 bits of encrypted data and
34 bits of fixed data followed by a guard period before
another code word can begin. Refer to Table 8-3 for
code word timing.
4.2
Code Word Organization
The HCS320 transmits a 66-bit code word when a
button is pressed. The 66-bit word is constructed from
a Fixed Code portion and an Encrypted Code portion
(Figure 4-2).
The 32 bits of
Encrypted Data
are generated from 4
button bits, 12 discrimination bits and the 16-bit sync
value. The encrypted portion alone provides up to four
billion changing code combinations.
The 34 bits of
Fixed Code Data
are made up of 2 sta-
tus bits, 4 button bits and the 28-bit serial number. The
fixed and encrypted sections combined increase the
number of code combinations to 7.38 x 10
19
.
FIGURE 4-1:
CODE WORD FORMAT
FIGURE 4-2:
CODE WORD ORGANIZATION
LOGIC ‘0’
LOGIC ‘1’
Bit
Period
Preamble
T
P
Header
T
H
Encrypted Portion
of Transmission
T
HOP
Fixed Portion of
Transmission
T
FIX
Guard
Time
T
G
T
E
T
E
T
E
50% Duty Cycle
Repeat
(1-bit)
V
LOW
(1-bit)
Function
Code
(4-bit)
Serial Number
(28 bits)
Function
Code
(4-bit)
OVR
(2 bits)
DISC
(10 bits)
Sync Counter
(16 bits)
34 bits of Fixed Portion
32 bits of Encrypted Portion
66 Data bits
Transmitted
LSb first.
LSb
MSb
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