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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)： | 22/44頁 |
| 文件大小： | 704K |
| 代理商： | HCS412SN |
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HCS412
DS41099C-page 22
Preliminary
2002 Microchip Technology Inc.
4.3.2
READ
The transponder reader sends one of seven possible
read commands indicating which 16-bit EEPROM word
to retrieve (Table 4-4). The HCS412 retrieves the data
and returns the 16-bit response.
Each Read response is preceded by a 1LF
TE
low
START pulse and ‘01b’ preamble (Figure 4-4).
The following locations are available to read:
The 64-bit general purpose user EEPROM.
(USER[3:0]).
The 32-bit serial number (SER[1:0]). The serial
number is also transmitted in each code hopping
transmission.
The16-bit Configuration word containing all non-
security related options.
FIGURE 4-4:
READ
4.3.3
WRITE
The transponder reader sends one of seven possible
write commands (Table 4-5) indicating which 16-bit
EEPROM word to write to. The 16-bit data to be written
follows the command. The HCS412 will attempt to write
the value into EEPROM and respond with an Acknowl-
edge sequence if successful.
The following locations are available to write:
The 64-bit general purpose user EEPROM.
(USER[3:0]) (Figure 4-6).
The 32-bit serial number (SER[1:0]). The serial
number is also transmitted in each code hopping
transmission (Figure 4-5).
The16-bit Configuration word containing all non-
security related configuration options. If the con-
figuration is written, the device must be RESET
before the new settings take effect (Figure 4-5).
A Transport Code, write access password, protects the
serial number and configuration word from undesired
modification. For these locations the reader must follow
the
WRITE
command with the appropriate 28-bit trans-
port code, then the 16 bits of data to write. Only a cor-
rect match with the transport code programmed during
production will allow write access to the serial number
and configuration word (Figure 4-5).
The delay to a successful write Acknowledge will vary
depending on the number of bits changed.
TABLE 4-4:
LIST OF READ COMMANDS
Command
Description
Expected data In
Response
00001
Read Configuration word
Read low serial number
Read high serial number
Read user EEPROM 0
Read user EEPROM 1
Read user EEPROM 2
Read user EEPROM 3
None
None
None
None
None
None
None
16-bit Configuration word
Lower 16 bits of serial number (SER0)
Higher 16 bits of serial number (SER1)
16 Bits of User EEPROM USR0
16 Bits of User EEPROM USR1
16 Bits of User EEPROM USR2
16 Bits of User EEPROM USR3
00010
00011
00100
00101
00110
00111
16-bit
Response
Start
T
RT
0 1
2 LF
TE
01b Preamble
Command
Communication from reader to HCS412
Communication from HCS412 to reader
b
b
b
0
0
ACK
Start
1 LF
TE
T
PU
T
ATO
Activate
Field
ACK
Delay to
Command
Command
Delay until
Response
16-bit Response
6 LF
TE
L
M
L
M
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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(fēng)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(fēng)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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