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ACR38 Reference Manual version 1.9 February 2006

Response data format

Header Status Data length BYTE 1 … … BYTE N PROT 1 PROT 2 PROT3 PROT 4 SW1 SW2

LEN

BYTE x Data read from memory card

PROT y Bytes containing the protection bits from protection memory

SW1, SW2 = 90

if no error

The arrangement of the protection bits in the PROT bytes is as follows:

PROT 1 PROT 2

…

P8 P7 P6 P5 P4 P3 P2 P1 P16 P15 P14 P13 P12 P11 P10 P9 .. .. .. .. .. .. P18 P17

Px is the protection bit of BYTE x in the response data

‘0’ byte is write protected

‘1’ byte can be written

8.2.7.3 WRITE_MEMORY_CARD

Command format

Header Instruction Data length Data

LEN CLA INS P1 Byte

Address

MEM_L Byte 1 .... .... Byte N

MSB LSB

Byte Address = A

is the memory address location of the memory card.

LEN = 5 + MEM_L

MEM_L Length of data to be written to the memory card.

Byte x Data to be written to the memory card.

Response data format

Header Status Data length SW1 SW2

LEN

SW1, SW2 = 90

if no error

8.2.7.4 WRITE_PROTECTION_MEMORY_CARD

Each of the bytes specified in the command is internally in the card compared with the byte stored at the

specified address and if the data matches, the corresponding protection bit is irreversibly programmed to ‘0’.

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ACS ACR 38 Manuel d'utilisateur Page 33