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參數(shù)資料
| 型號： | HCS473IPROM |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Code Hopping Encoder and Transponder |
| 中文描述： | 跳碼編碼器和轉發(fā)器 |
| 文件頁數(shù)： | 27/68頁 |
| 文件大?。?/td> | 1629K |
| 代理商： | HCS473IPROM |
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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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