MRF49XAT-I-ST Datasheet, PDF (38/102 Pages) Microchip Technology – ISM Band Sub-GHz RF Transceiver

MRF49XA
REGISTER 2-14: WTSREG: WAKE-UP TIMER VALUE SET REGISTER (POR: 0xE196)
W-1
W-1
W-1
W-0
W-0
W-0
W-0
CCB<15:13>
WTEV<4:0>
bit 15
W-1
bit 8
W-1
W-0
W-0
W-1
W-0
W-1
W-1
W-0
WTMV<7:0>
bit 7
bit 0
Legend:
R = Readable bit
-n = Value at POR
r = reserved bit
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-13
bit 12-8
bit 7-0
CCB<15:13>: Command Code bits
The command code bits (111b) are serially sent to the microcontroller to identify the bits to be written
in the WTSREG.
WTEV<4:0>: Wake-up Timer Exponential Value bits
These bits define the exponential value to be used to set up the time interval. The value must be a
decimal equivalent between 0 and 29⁽¹⁾.
WTMV<7:0>: Wake-up Timer Multiplier Exponential Value bits
These bits define the multiplier value to be used to set up the time interval. The value must be a
decimal equivalent between 0 and 255⁽¹⁾.
Note 1: The WTSREG sets the wake-up interval for the device. After setting the wake-up time, the WUTEN bit
(PMCREG<1>) must be cleared and set at the end of every wake-up cycle. The wake-up duration can be
calculated using Equation 2-7.
EQUATION 2-7:
WUTIME (ms) =[1.03 x WTMV<7:0> x 2^WTEV<4:0>] + 0.5 ms
where:
WTMV<7:0> = Decimal Value between 0 to 255
WTEV<4:0> = Decimal Value between 0 to 29
DS70590C-page 38
Preliminary
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