Advanced Card Systems Limited ACR1281U Benutzerhandbuch
ACR1281U
Advanced Card Systems Ltd.
Page 59 of 81
BYTE 1
…
…
BYTE N
SW1
SW2
• BYTE x
Data read from memory card
• SW1, SW2
= 90 00 if no error
7.3 Write One Byte Memory Card
To write one byte to the specified address of the inserted card. The byte is written to the card with
LSB first, i.e., the bit at card address 0 is regarded as the LSB of byte 0.
LSB first, i.e., the bit at card address 0 is regarded as the LSB of byte 0.
Four different WRITE modes are available for this card type, which are distinguished by a flag in
the command data field:
the command data field:
a)
Write
The byte value specified in the command is written to the specified address. This command
can be used for writing personalization data and counter values to the card.
can be used for writing personalization data and counter values to the card.
b) Write with carry
The byte value specified in the command is written to the specified address and the
command is sent to the card to erase the next lower counter stage. This write mode can
therefore only be used for updating the counter value in the card.
command is sent to the card to erase the next lower counter stage. This write mode can
therefore only be used for updating the counter value in the card.
c)
Write with backup enabled (SLE4436, SLE5536 and SLE6636 only)
The byte value specified in the command is written to the specified address. This command
can be used for writing personalization data and counter values to the card. Backup bit is
enabled to prevent data loss when card tearing occurs.
can be used for writing personalization data and counter values to the card. Backup bit is
enabled to prevent data loss when card tearing occurs.
d) Write with carry and backup enabled (SLE4436, SLE5536 and SLE6636 only)
The byte value specified in the command is written to the specified address and the
command is sent to the card to erase the next lower counter stage. This write mode can
therefore only be used for updating the counter value in the card. Backup bit is enabled to
prevent data loss when card tearing occurs.
command is sent to the card to erase the next lower counter stage. This write mode can
therefore only be used for updating the counter value in the card. Backup bit is enabled to
prevent data loss when card tearing occurs.
With all write modes, the byte at the specified card address is not erased prior to the write operation
and, hence, memory bits can only be programmed from '1' to '0'.
The backup mode available in the SLE4436 and SLE5536 card can be enabled or disabled in the
write operation.
and, hence, memory bits can only be programmed from '1' to '0'.
The backup mode available in the SLE4436 and SLE5536 card can be enabled or disabled in the
write operation.
• Command format
Pseudo-APDU
CLA
INS
P1
Byte
Address
MEM_L
MODE
BYTE
FF
H
D0
H
00
H
02
H
Byte Address
= Memory address location of the memory card.
MODE
Specifies the write mode and backup option
00 : write
01 : write with carry