5 Non-Volatile Memory Information
The SAM R21 provides a user readable Non-Volatile Memory (NVM) space referred to as the user row in the data sheet. The base address for the application is 0x804008.
| Offset Address | Field Name | Field Description | Length |
|---|---|---|---|
| +0x00 | MIB_REVISION | Data structure revision 0x1501 | 2 Bytes |
| +0x02 | MAC_IEEE_ADDRESS | Module specific IEEE MAC Address | 8 Bytes |
| +0x0A | BOARD_SERIAL | Module specific serial number | 10 Bytes |
| +0x14 | ATMEL_PART_NO | Product specific part number | 8 Bytes |
| +0x1C | PCBA_REV | Product PCB/assembly revision | 1 Byte |
| +0x1D | XTAL_TRIM | Reference crystal calibration value | 1 Byte |
| +0x1E | CRC16 | Checksum for this data structure, CCITT CRC-16 | 2 Bytes |
The end user application software has to copy two data fields to radio transceiver registers. The data in MAC_IEEE_ADDRESS have to be copied to the registers IEEE_ADDR_0 to _7. The MAC_IEEE_ADDRESS is stored little endian with the LSB stored at the lowest address.
The XTAL_TRIM value is determined during production test and needs to be copied to the transceiver XTAL_TRIM section inside the XOSC_CTRL register. This reduces the absolute deviation for the 16 MHz reference crystal. For parameter details, see Module Performance Data.