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參數(shù)資料
| 型號： | HCS412SN |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | KEELOQ Code Hopping Encoder and Transponder |
| 中文描述： | 而Keeloq跳碼編碼器和轉(zhuǎn)發(fā)器 |
| 文件頁數(shù)： | 34/44頁 |
| 文件大?。?/td> | 704K |
| 代理商： | HCS412SN |
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HCS412
DS41099C-page 34
Preliminary
2002 Microchip Technology Inc.
7.0
PROGRAMMING THE HCS412
The HCS412 requires some parameters programmed
into the device before it can be used. The programming
cycle allows the user to input all 288 bits in a serial data
stream, which are then stored internally in EEPROM.
Programming is initiated by forcing the DATA line high,
after the S2 line has been held high for the appropriate
length of time line (Table 7-1 and Figure 7-2).
A delay is required after entering Program mode while
the automatic bulk erase cycle completes. The bulk
erase writes all EEPROM locations to zeros.
The device is then programmed by clocking in the
EEPROM memory map (Least Significant bit first) 16
bits at a time, using S2 as the clock line and DATA as
the data-in line. After each 16-bit word is loaded, a pro-
gramming delay is required for the internal program
cycle to complete. This delay can take up to Twc.
The HCS412 will signal a ‘write complete’ after writing
each 16-bit word by sending out a series of ACK pulses
T
ACKH
high, T
ACKL
low on DATA. The ACK pulses con-
tinue until S2 is dropped.
Programming verification is allowed only once, after the
programming cycle (Figure 7-3), by reading back the
EEPROM memory map. Reading is done by clocking
the S2 line and reading the data bits on DATA, again
Least Significant bit first. For security reasons, it is not
possible to execute a Verify function without first pro-
gramming the EEPROM.
FIGURE 7-1:
CREATION AND STORAGE OF CRYPT KEY DURING PRODUCTION
FIGURE 7-2:
PROGRAMMING WAVEFORMS
FIGURE 7-3:
VERIFY WAVEFORMS
Note:
To ensure that the device does not acci-
dentally enter Programming mode, DATA
should never be pulled high by the circuit
connected to it. Special care should be
taken when driving PNP RF transistors.
Transmitter
Serial Number
Manufacturer’s
Code
Crypt
Key
Key
Generation
Algorithm
Serial Number
Crypt Key
Sync Counter
.
.
.
HCS412
Production
Programmer
EEPROM Array
DATA
(Data)
Enter Program
Mode
(Clock)
Note 1:
S0 and S1 button inputs to be held to ground during the entire programming sequence.
Bit 0
Bit 1
Bit 2
Bit 3
Bit 14
Bit 15
Bit 16
Bit 17
T
PH
1
T
PBW
T
PS
Repeat for each word (18 times total)
T
PH
2
T
CLKH
T
CLKL
T
WC
T
DS
S2
Data for Word 1
(KEY1_1)
T
DH
T
CLKL
Initiate Data
Polling Here
Write Cycle
Complete Here
T
ACKL
T
ACKH
Calibration Pulses
T
PHOLD
Ack
Ack
Ack
Data for Word 0
(KEY1_0)
DATA
(Data)
(Clock)
Note:
If a Verify operation is to be done, then it must immediately follow the Program cycle.
End of Programming Cycle
Beginning of Verify Cycle
Bit 1
Bit 2
Bit 3
Bit 15
Bit 14
Bit 16 Bit 17
Bit190 Bit191
T
WC
Data from Word 0
T
DV
S2
Bit 0
Bit191
Bit190
Ack
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| HCS412T | KEELOQ Code Hopping Encoder and Transponder |
| HCS412TI | KEELOQ Code Hopping Encoder and Transponder |
| HCS412TP | Dual PCI 2.2 Hot-Swap Controllers |
| HCS412 | Code Hopping Encoder and Transponder(編碼器和收發(fā)兩用機) |
| HCS412I | +48V Quad Hot-Swap Controllers For Power-Over-LAN |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HCS412T | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:KEELOQ Code Hopping Encoder and Transponder |
| HCS412T/SN | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 w/ Passive Entry RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| HCS412TI | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:KEELOQ Code Hopping Encoder and Transponder |
| HCS412T-I/SN | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 w/ Passive Entry RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| HCS412TP | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:KEELOQ Code Hopping Encoder and Transponder |
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