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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
W-1
bit 15
CCB<15:13>
WTEV<4:0>
bit 8
W-1
W-0
W-0
W-1
W-0
W-1
W-1
W-0
WTMV<7:0>
bit 7
Legend:
r = reserved bit
bit 0
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-13
bit 12-8
bit 7-0
Note 1:
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) .
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
? 2009-2011 Microchip Technology Inc.
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