Datasheet

MRF49XA

W-1 W-0 W-0 W-1 W-0 W-0 W-0 W-0

CCB<15:11> FINTDIO DIORT<1:0>

bit 15 bit 8

W-1 W-0 W-0 W-0 W-0 W-0 W-0 W-0

RXBW<2:0> RXLNA<1:0> DRSSIT<2:0>

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 15-11 CCB<15:11>: Command Code bits

The command code bits (10010b) are serially sent to the microcontroller to identify the bits to be

written in the RXCREG.

bit 10 FINTDIO: Function Interrupt/Data Indicator Output bit

Sets the pin 16 function as the DIO or interrupt.

1 = DIO output

0 = INT

input

bit 9-8 DIORT<1:0>: Data Indicator Output Response Time bits

If pin 16 is selected as DIO, these bits set the response time within which the transceiver detects and

indicates the incoming synchronous bit pattern, and issues an interrupt to the host microcontroller.

11 = Continuous

10 = Slow

01 = Medium

00 = Fast

bit 7-5 RXBW<2:0>: Receiver Baseband Bandwidth bits

These bits set the bandwidth of demodulated data. The bandwidth can accommodate different data

rates and deviations during frequency keying.

111 = Reserved

110 = 67 kHz

101 = 134 kHz

100 = 200 kHz

011 = 270 kHz

010 = 340 kHz

001 = 400 kHz

000 = Reserved

bit 4-3 RXLNA<1:0>: Receiver LNA Gain bits

These bits, when set to different values, can accommodate environments with high interferences. The

LNA gain also affects the true RSSI value.

11 = -20 dB

10 = -14 dB

01 = -6 dB

00 = 0 dB