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| 型号： | HCS473SLSQTP |
| 厂商： | Microchip Technology Inc. |
| 英文描述： | Code Hopping Encoder and Transponder |
| 中文描述： | 跳码编码器和转发器 |
| 文件页数： | 27/68页 |
| 文件大小： | 1629K |
| 代理商： | HCS473SLSQTP |
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2002 Microchip Technology Inc.
Preliminary
DS40035C-page 25
HCS473
3.2.3.2
PRESENT TRANSPORT CODE
Prior to modifying the device EEPROM, the correct 32-
bit transport code (password) must be presented to
gain write access. This is done with the PRESENT
TRANSPORT CODE command followed by the 32-bit
transport code and CRC calculated on the 3-bit com-
mand and 32 bits of data.
The HCS473 will return an Acknowledge if the trans-
port code matches the value programmed in produc-
tion; write access has been granted.
The next command (usually a write) must begin T
CMD
after the Acknowledge, Figure 3-13.
The present transport code sequence must precede a
write sequence but not necessarily immediately. Per-
haps all four user memory locations will be written and
verified. The present transport code sequence must
precede only the first write to gain write access. The
system may then alternately write and read (verify)
multiple memory locations. Write access remains until
the next time the device returns to Low Power mode -
communication error or T
CMD
time out without receiving
another command.
FIGURE 3-13:
PRESENT TRANSPORT CODE SEQUENCE (RF RESPONSE EXAMPLE)
T
SF
ACK
CMD
TCODE
T
CMD
‘001
2
’
CRC
2 bits
32 bits
‘
‘
‘
L
Command
M
C
C
CRC
b
b
32-Bit
Transport
b
M
L
ACK
Transport ACK
T
TPACK
b
CMD
ADR
DATA
T
CMD
WRITE Sequence
‘
‘
‘
b
b
b
Address
Command
b
b
16-Bit
Write Data
b
b
T
CMD
Write
Wake Sequence
or
Previous Command
Response
Inductive In
(LC Pins)
RF Response
(DATA Pin)
T
CMD
T
CMD
5 LF
TE
T
CMD
T
FINH
M
L
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相关代理商/技术参数 |
参数描述 |
|---|---|
| HCS473-SLSQTP | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Code Hopping Encoder and Transponder |
| HCS473T/SL | 功能描述:编码器、解码器、复用器和解复用器 w/ Passive Entry RoHS:否 制造商:Micrel 产品:Multiplexers 逻辑系列:CMOS 位数: 线路数量（输入/输出）:2 / 12 传播延迟时间:350 ps, 400 ps 电源电压-最大:2.625 V, 3.6 V 电源电压-最小:2.375 V, 3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Tray |
| HCS473T-I/SL | 功能描述:编码器、解码器、复用器和解复用器 w/ Passive Entry RoHS:否 制造商:Micrel 产品:Multiplexers 逻辑系列:CMOS 位数: 线路数量（输入/输出）:2 / 12 传播延迟时间:350 ps, 400 ps 电源电压-最大:2.625 V, 3.6 V 电源电压-最小:2.375 V, 3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Tray |
| HCS4870C | 制造商:Power-One 功能描述:POWER SUPPLY |
| HCS500 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Memory Programming Specification |
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