MRF49XA-ISLASHT datasheet(39/102 Pages) MICROCHIP

39 / 102 page

Preliminary

DS70590C-page 39

MRF49XA

EQUATION 2-8:

DCSREG: DUTY CYCLE VALUE SET REGISTER (POR: 0xC80E)

W-1

W-0

W-1

W-0

CCB<15:8>

bit 15

bit 8

W-0

W-1

W-0

DCMV<6:0>

DCMEN

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 15-8

CCB<15:8>: Command Code bits

The command code bits (11001000b) are serially sent to the microcontroller to identify the bits to be

written in the DCSREG.

bit 7-1

DCMV<6:0>: Duty Cycle Multiplier Value bits

These bits are used to calculate the duty cycle or on time of the receiver after the wake-up timer has

brought the MRF49XA out of Sleep mode(1).

bit 0

DCMEN: Duty Cycle mode Enable bit

1 = Enables the Duty Cycle mode

0 = Disables the Duty Cycle mode

Note 1: For operation in Duty Cycle mode, the receiver must be disabled (RXCEN = 0) and the wake-up timer

must be enabled (WUTEN = 1) in PMCREG. The registers, DCSREG and WTSREG, can be used to

reduce the current consumption of the receiver. The DCSREG can be set up so that when the wake-up

timer brings the MRF49XA out of Sleep mode, the receiver is turned on for a short period to sample the

signal presence before returning to Sleep. The process in the Duty Cycle mode starts over. The duty cycle

uses the multiplier value of the wake-up timer, in parts for its calculation, as shown in Equation 2-8.

DC = [(DCMV<7:1> x 2 + 1)]/[WTMV<7:0> x 100%]

where:

WTMV is WTMV<7:0> bits of the WTSREG.

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