Advanced Card Systems Limited ACR1281U User Manual

ACR1281U



Advanced Card Systems Ltd.

Page 52 of 81

Pseudo-APDU

Byte Address

CLA

INS

MSB

LSB

MEM_L

MSB Byte Address

= 0000 00A9A8 b is the memory address location of the memory card.

LSB Byte Address

= A7A6A5A4 A3A2A1A0 b is the memory address location of the memory

card.

MEM_L

Length of protection bits to be read from the card, in multiples of 8 bits.

Maximum value is 32.

MEM_L = 1 + INT( (number of bits-1)/8 )

For example, to read eight protection bits starting from memory 0x0010, the

following pseudo-APDU should be issued:

0xFF 0xB1 0x00 0x10 0x01

• Response data format

PROT 1

…

PROT L

SW1

SW2

• PROT y

Bytes containing the protection bits

• SW1,SW2

= 90 H 00 H if no error

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

PROT 1

PROT 2

….

P16

P15

P14

P13

P12

P11

P10

P18

P17

•  Px is the protection bit of BYTE x in the response data
•  ‘0’ byte is write protected
•  ‘1’ byte can be written

5.5 Write Memory Card

• Command format

Pseudo-APDU

Byte Address

CLA

INS

MSB

LSB

MEM_L

Byte 1

....

Byte N