RFM42 Datasheet, PDF (82/110 Pages) –

RFM42/43
Register 55h. Calibration Control
Bit
Name
Type
D7
Reserved
R
D6
xtalstarthalf
R/w
D5
Reserved
R
D4
enrcfcal
R/w
D3
rccal
R/w
D2
vcocaldp
R/w
D1
vcocal
R/w
D0
skipvco
R/w
Reset value = x1x00100
Bit
Name
7
Reserved
6
xtalstarthalf
5
Reserved
4
enrcfcal
3
rccal
2
vcocaldp
1
vcocal
0
skipvco
Function
Reserved.
If Set, the Xtal Wake Time Period is Halved.
Reserved.
RC Oscillator Fine Calibration Enable.
If this bit is set to 1 then the RC oscillator performs fine calibration in every app. 30 s.
RC Calibration Force.
If setting rccal = 1 will automatically perform a forced calibration of the 32 kHz RC
Oscillator. The RC OSC will automatically be calibrated if the Wake-Up-Timer is
enabled. The calibration takes 2 ms. The 32 kHz RC oscillator must be enabled to
perform a calibration. Setting this signal from a 0 to 1 will initiate the calibration. This bit
is cleared automatically.
VCO Calibration Double Precision Enable.
When this bit is set to 1 then the VCO calibration measures longer thus
calibrates more precisely.
VCO Calibration Force.
If in Idle Mode and pllon = 1, setting vcocal = 1 will force a one time calibration
of the synthesizer VCO. This bit is cleared automatically.
Skip VCO Calibration.
Setting skipvco = 1 will skip the VCO calibration when going from the Idle state
to the TX state.
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