MRF49XA-ISLASHT datasheet(36/102 Pages) MICROCHIP

36 / 102 page

MRF49XA

DS70590C-page 36

Preliminary

PMCREG: POWER MANAGEMENT CONFIGURATION REGISTER

(POR: 0x8208)

W-1

W-0

W-1

W-0

CCB<15:8>

bit 15

bit 8

W-0

W-1

W-0

RXCEN

BBCEN(1)

TXCEN

SYNEN

OSCEN

LBDEN

WUTEN(3)

CLKOEN

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 (10000010b) are serially sent to the microcontroller to identify the bits to be

written in the PMCREG.

bit 7

RXCEN: Receiver Chain Enable bit

The receiver chain consists of a baseband circuit, synthesizer and crystal oscillator.

1 = Enables receiver chain

0 = Disables receiver chain

bit 6

BBCEN: Baseband Circuit Enable bit(1)

The baseband circuit, synthesizer and oscillator work together to demodulate and recover the data

transmitted to the synthesizer (SYNEN bit). The OSCEN bit must be enabled along with the baseband

circuits in order to receive data.

1 = Enables baseband circuit

0 = Disables baseband circuit

bit 5

TXCEN: Transmit Chain Enable bit

The transmit chain consists of power amplifier, synthesizer, oscillator and transmit register.

1 = Enables the transmitter chain and starts transmission (if the TX register is enabled)

0 = Disables transmitter chain

bit 4

SYNEN: Synthesizer Enable bit

The synthesizer consists of a PLL, oscillator and VCO for controlling the channel frequency.

1 = Enables the synthesizer

0 = Disables the synthesizer

bit 3

OSCEN: Crystal Oscillator Enable bit

1 = Enables the crystal oscillator

0 = Disables the crystal oscillator

bit 2

LBDEN: Low Battery Detector Enable bit

The battery detector can be programmed to 32 different threshold levels(2).

1 = Enables the battery voltage detector circuit

0 = Disables the battery voltage detector circuit

bit 1

WUTEN: Wake-up Timer Enable bit(3)

1 = Enables the wake-up timer circuit

0 = Disables the wake-up timer circuit

Note 1: This bit can be disabled to reduce current consumption.

2: See BCSREG (Register 2-16) for programming details.

3: See WTSREG (Register 2-14) for details on programming the wake-up timer value.

4: If the CLKOEN bit is cleared by enabling the clock output, the oscillator continues to run even if the

OSCEN bit is cleared. The device will not fully enter into the Sleep mode.

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