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ISO 15693-Compliant 1Kb Memory Fob
Table 5. Error Code Matrix
FAILING COMMANDS
ERROR DESCRIPTION
Invalid block number
Already locked
Write access failed because block is locked
ERROR
CODE
10h
11h
12h
Detailed Command Descriptions
In the request data graphics of this section, the UID
field is shaded to indicate that the inclusion of the UID
depends on the address mode.
Get System Information
The Get System Information command allows the mas-
ter to retrieve technical information about the
MAX66120. The IC reference code indicates the die
revision in hexadecimal format, such as A1h, A2h, B1h,
etc.
Write Single Block
The normal way to write data to the device is through
the Write Single Block command. This command uses
one command-specific parameter, which is the memory
block number. Valid block numbers are 00h to 11h.
Writing a block takes t PROG . The response is transmit-
ted after the memory is updated.
Depending on the protection settings of the memory
location to be updated, the MAX66120 manipulates
data as it arrives in a buffer. Upon receiving a Write
Single Block request for a write-protected location (e.g.,
a self-locking nibble or byte in memory block 11h), the
buffer is loaded with the data already in memory, rather
than the data transmitted in the request. Similarly, if the
target memory block is in EPROM mode, the buffer is
loaded with the bitwise logical AND of the transmitted
data and data already in memory. In all other cases, the
data sent by the master arrives in the buffer unaltered.
Request Data for the Get System Information Command
REQUEST FLAGS
(1 Byte)
COMMAND
2Bh
UID
(8 Bytes)
Response Data for the Get System Information Command (No Error)
RESPONSE
FLAGS
00h
INFO
FLAGS
0Fh
UID
(8 Bytes)
DSFID
(1 Byte)
AFI
(1 Byte)
NUMBER OF
BLOCKS
12h
MEMORY BLOCK
SIZE
07h
IC REFERENCE
(1 Byte)
Request Data for the Write Single Block Command*
REQUEST FLAGS
(1 Byte)
COMMAND
21h
UID
(8 Bytes)
BLOCK NUMBER
(1 Byte)
NEW BLOCK DATA
(8 Bytes)
*If this command is processed without any error, the slave responds with a response flags byte of 00h.
16
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