ACS ACR38 SAM Smart Card Reader - Manual (Page 36)

ACR38x – Reference Manual [email protected]
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9.2.2.7. Memory Card – SLE 4406/SLE 4436/SLE 5536/SLE 6636
9.2.2.7.1. READ_MEMORY_CARD
Send Buffer Format
SCardTransmit Send Buffer
CLA INS P1 Byte Address (P2) MEM_L (P3)
FFh B0h 00h
Where:
Byte Address = Memory address location of the memory card.
MEM_L
Length of data to be read from the memory card.
Response Buffer Format
SCardTransmit Receive Buffer
BYTE 1 … … BYTE N SW1 SW2
Where:
BYTE x Data read from memory card.
SW1 SW2 = 90 00h if no error.
9.2.2.7.2. WRITE_ONE_BYTE_MEMORY_CARD
This command is used to write one byte to the specific 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.
Four different WRITE modes are available for this card type, which are distinguished by a flag in 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.
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.
c. Write with backup enabled (SLE 4436, SLE 5536 and SLE 6636 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.
d. Write with carry and backup enabled (SLE 4436, SLE 5536 and SLE 6636 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.
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 SLE 4436 and SLE 5536 card can be enabled or disabled in the