7.4.4 Read Process

The CMD=0x0003 command reads a unique address.

The CMD=0x0002 command reads several consecutive addresses. In this case the frame will be composed of 32 bits for the address, 16 bits for the command and as many SCK pulses (always multiple of 32) as needed to read data.

To read a fuse box, it must have been written previously in the corresponding Tamper register. The content of Tamper registers KEY_ENC_BOX, KEY_TAG_BOX or CONTROL_BOX are written to the buffer with the commands CMD=0x000D, CMD=0x000E and CMD=0x0010, respectively. Once the Tamper register is written, it can be read with the command CMD=0x0011.