RFM31 Datasheet, PDF (80/137 Pages) –

RFM31
Note: If a new configuration is needed (e.g., for the WUT or the LDC), proper functionality is required. The
function must first be disabled, then the settings changed, then enabled back on.
Register 14h. Wake-Up Timer Period 1
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
Reserved
wtr[4:0]
Type
R/w
R/w
Reset value = xxx00011
Bit
Name
Function
7：5
Reserved Reserved.
4：0
wtr[4:0]
Wake Up Timer Exponent (R) Value*.
Maximum value for R is decimal 20. A value greater than 20 will yield a result
as if 20 were written. R Value = 0 can be written here.
*Note: The period of the wake-up timer can be calculated as TWUT = (4 x M x 2^R ) / 32.768 ms. R = 0 is allowed, and the
maximum value for R is decimal 20. A value greater than 20 will result in the same as if 20 was written.
Register 15h. Wake-Up Timer Period 2
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
wtm[15:8]
Type
R/W
Reset value = 00000000
Bit
Name
Function
7：0
wtm[15:8] Wake Up Timer 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 16h. Wake-Up Timer Period 3
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
wtm[7:0]
Type
R/W
Reset value = 00000001
Bit
Name
Function
7：0
wtm[7:0]
Wake Up Timer Mantissa (M) Value*.
M[7:0] = 0 is not valid here. Write at least decimal 1.
*Note: The period of the wake-up timer can be calculated as TWUT = (4 x M x 2^R ) / 32.768 ms.
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