MRF49XA-ISLASHT datasheet(38/102 Pages) MICROCHIP

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MRF49XA

DS70590C-page 38

Preliminary

EQUATION 2-7:

WTSREG: WAKE-UP TIMER VALUE SET REGISTER (POR: 0xE196)

W-1

W-0

W-1

CCB<15:13>

WTEV<4:0>

bit 15

bit 8

W-1

W-0

W-1

W-0

W-1

W-0

WTMV<7:0>

bit 7

bit 0

Legend:

r = reserved bit

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

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.

bit 12-8

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).

bit 7-0

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.

WUTIME (ms) =[1.03 x WTMV<7:0> x 2WTEV<4:0>] + 0.5 ms

where:

WTMV<7:0> = Decimal Value between 0 to 255

WTEV<4:0> = Decimal Value between 0 to 29

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