RFM31 Datasheet, PDF (81/137 Pages) –

RFM31
Register 17h. Wake-Up Timer Value 1
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
wtm[15:8]
Type
R
Reset value = xxxxxxxx
Bit
Name
Function
7：0
wtm[15:8] Wake Up Timer Current Mantissa (M) Value*.
*Note: The period of the wake-up timer can be calculated as TWUT = (4 x M x 2^R ) / 32.768 ms.
Register 18h. Wake-Up Timer Value 2
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
wtm[7:0]
Type
R
Reset value = xxxxxxxx
Bit
Name
Function
7：0
wtm[7:0] Wake Up Timer Current Mantissa (M) Value*.
*Note: The period of the wake-up timer can be calculated as TWUT = (4 x M x 2^R ) / 32.768 ms.
Register 19h. Low-Duty Cycle Mode Duration
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
ldc [7:0]
Type
R/W
Reset value = 00000001
Bit
Name
Function
Low-Duty Cycle Mode Duration (LDC)*.
If enabled, the LDC will start together when the WUT is supposed to start, and
7：0
ldc [7:0]
the duration of the LDC is specified by the address 19h and the equation that
goes with it. In order for the LDC to work, the LDC value has to be smaller than
the M value specified in registers 15h and 16h.
LDC = 0 is not allowed here. Write at least decimal 1.
*Note: The period of the low-duty cycle ON time can be calculated as TLDC_ON = (4 x LDC x 2^R ) / 32.768 ms. R is the
same as in the wake-up timer setting in "Register 14h. Wake-Up Timer Period 1".
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