RFM42 Datasheet, PDF (68/110 Pages) –

RFM42/43
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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