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4 Functional Description
4.1 Overview
The RFID A1 module is designed to provide a simple interface to communicate and manage RFID tags from the
Mifare Classic, Ultralight and NTAG2 families. The interface is provided via SPI and I2C busses. From the user
perspective, the module is a memory region where he can read from and write to. Depending upon the memory
address, the role of registers located in the memory differ as per the Memory Map description given in Chapter 3.3.
By writing to and reading from these registers, the user can achieve the desired result.
Mifare Classic, Ultralight and NTAG2 families. The interface is provided via SPI and I2C busses. From the user
perspective, the module is a memory region where he can read from and write to. Depending upon the memory
address, the role of registers located in the memory differ as per the Memory Map description given in Chapter 3.3.
By writing to and reading from these registers, the user can achieve the desired result.
4.2 Commands
The RFID A1 Module has a special register, the Command Register. Writing to this register is interpreted as a
command execution request from the user. The command type corresponds to the value written into the register.
Execution of a command starts when the communication is finished. Depending upon the bus used, definition of the
communication endpoint varies. When using the I2C bus, communication is finished when a STOP condition is sent.
In case of the SPI bus, communication is finished on the rising edge of the CS signal.
command execution request from the user. The command type corresponds to the value written into the register.
Execution of a command starts when the communication is finished. Depending upon the bus used, definition of the
communication endpoint varies. When using the I2C bus, communication is finished when a STOP condition is sent.
In case of the SPI bus, communication is finished on the rising edge of the CS signal.
The nBUSY line goes from the high state to the low state and indicates that the module is busy (it parses data stored
in the registers and executes commands, if any command was sent). A more detailed description of the signal
behavior is given in chapter Error! Reference source not found..
in the registers and executes commands, if any command was sent). A more detailed description of the signal
behavior is given in chapter Error! Reference source not found..
The full RFID A1 command list is shown below in Table 4.1.