10.8.2 Read Config Zone

To read 256 bytes, the host must set N = $00. This is true for any outgoing command and is defined by ISO 7816-3. If the address provided at P2 is unauthorized, the device will return the "Command Unauthorized" code ($69 $00) after it has received the header. Since access rights vary throughout the Configuration zone, the host may provide an authorized starting address but specify a number of bytes, N, that causes the device to reach unauthorized data. In this case, the device will transmit the authorized bytes, but unauthorized bytes will be replaced by the "fuse byte" (see below). At the end of this command, the "Command Unauthorized" code ($69 $00) will be returned instead of $90 $00 to indicate that some of the bytes returned are not valid.