12.4 System Option 1

The system option 1 value combines several configuration parameters into one byte, using each bit to represent different parameter options (see the following table). When a programmer is modifying any bit field within this byte-wide memory location, the programmer must perform a read-modify-write type of operation. This prevents accidentally altering bit field values, which were not the intended target bit, causing unwanted device behavior changes.

Table 12-4. System Option 1 Parameter Table
ParameterValueParameter DescriptionLength
0x2A0xXX
  • Bit [7] – Reserved, set as zero
  • Bit [6] – Data Length Extension
  • Bit [5] – Link Manager Version
  • Bit[4:3] – BLE Security Enable
  • Bit[2] – LE Secure Connections Type
  • Bit[1] – UART RX IND (Low Power Mode)
  • Bit[0] – Link Quality Detection
1 byte