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| 型号： | HCS473PQTP |
| 厂商： | Microchip Technology Inc. |
| 英文描述： | IC EEPROM SPI BUS 8KBIT 8-SOIC |
| 中文描述： | 跳码编码器和转发器 |
| 文件页数： | 30/68页 |
| 文件大小： | 1629K |
| 代理商： | HCS473PQTP |
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HCS473
DS40035C-page 28
Preliminary
2002 Microchip Technology Inc.
3.2.3.5
WRITE Command
The transponder reader follows the 3-bit WRITE com-
mand with one of eight possible 3-bit address options
indicating which 16-bit EEPROM word to write to
(Table 3-5) and a 2-bit CRC calculated over the com-
mand, address and data bits.
The HCS473 will attempt to write the value into
EEPROM, responding with an Acknowledge sequence
if successful (Figure 3-15).
The following locations are available to write:
The 64-bit general purpose user EEPROM.
The 32-bit serial number.
The16-bit Device Identifiers #1 and #2.
A Transport Code, write access password, protects the
memory locations from undesired modification. The
reader must precede the Write sequence with a suc-
cessful PRESENT TRANSPORT CODE sequence.
Only a correct match with the transport code pro-
grammed during production will allow write access to
the memory locations.
The next command must begin T
CMD
after the write
Acknowledge.
The PRESENT TRANSPORT CODE sequence must
precede a WRITE sequence but not necessarily imme-
diately. Perhaps all four user memory locations will be
written and verified. The PRESENT TRANSPORT
CODE sequence must precede only the first write. The
system may then alternately write and read (verify)
multiple memory locations. Write access status
remains until the next time the device returns to sleep -
communication error or T
CMD
without receiving another
command.
FIGURE 3-16:
WRITE SEQUENCE (RF RESPONSE EXAMPLE)
T
CMD
b
b
b
Next
Command
T
CMD
Inductive In
(LC Pins)
CMD
ADR
DATA
T
CMD
‘101
2
’
3 bits 16 bits
ACK
CRC
2 bits
T
WRT
‘
‘
‘
b
b
L
M
b
Address
Command
M
L
C
C
CRC
T
FINH
T
WRT
Write ACK
b
b
16-Bit
Write Data
b
M
L
b
Optional Next
Command
T
CMD
T
CMD
RF Response
(DATA Pin)
T
CMD
LF must remain on if following
with consecutive command
or if waiting for LF response
5 LF
TE
Sequence
Previous Command
Sequence
Previous Command
M
L
相关PDF资料 |
PDF描述 |
|---|---|
| HCS473PROM | IC EEPROM SPI BUS 32KBIT 8-SOIC |
| HCS473PSQTP | Code Hopping Encoder and Transponder |
| HCS473SLQTP | Code Hopping Encoder and Transponder |
| HCS473SLROM | Code Hopping Encoder and Transponder |
| HCS473SLSQTP | Code Hopping Encoder and Transponder |
相关代理商/技术参数 |
参数描述 |
|---|---|
| HCS473-PQTP | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Code Hopping Encoder and Transponder |
| HCS473PROM | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Code Hopping Encoder and Transponder |
| HCS473-PROM | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Code Hopping Encoder and Transponder |
| HCS473PSQTP | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Code Hopping Encoder and Transponder |
| HCS473-PSQTP | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Code Hopping Encoder and Transponder |
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