Description of fields within Sub-Register 0x2B:0E – FS_XTALT
RESERVED
reg:2B:0E
bit:7:5
This field is reserved.
N.B.: Any change in the value of this field will cause the DW1000 to malfunction.
Crystal Trim. Crystals may be trimmed using this register setting to tune out errors, see 8.1 –
IC Calibration – Crystal Oscillator Trim.
7.2.44.6 Sub-Register 0x2B:0F – FS_RES3
Frequency synthesiser – Reserved area 3
Register file: 0x2B – Frequency synthesiser control block, sub-register 0x0F is a reserved area. Please take
care not to write to this area as doing so may cause the DW1000 to malfunction.
7.2.45 Register file: 0x2C – Always-on system control interface
Always on system control interface block
Register map register file 0x2C is the Always-On system control block, (AON).
The AON block contains a low-power configuration array that remains powered-up as long as power (from
the battery, for example) is supplied to the DW1000 via the VDDAON pin. User configurations, from SPI
accessible host interface registers, can be automatically saved in the AON memorywhen the DW1000 enters
SLEEP or DEEPSLEEP states and automatically restored from the AON memorywhen the DW1000 wakes from
sleeping. Additional discussion of these modes may be found in section 2.4.1 – SLEEP and DEEPSLEEP.
This Register file: 0x2C – Always-on system control interface controls the functions that remain on when the
IC enters its low-power SLEEP or DEEPSLEEP states, and configures the activities the DW1000 should take as
the IC wakes from these sleep states. It contains a number of sub-registers. An overview of these is given by
Table 45. Each of these sub-registers is separately described in the sub-sections below.
Table 45: Register file: 0x2C – Always-on system control overview
AON Wakeup Configuration Register
AON Direct Access Read Data Result
AON Direct Access Address
AON Configuration Register 0
AON Configuration Register 1
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