CC1021 datasheet(66/94 Pages) TI

66 / 94 page

CC1021

SWRS045C

Page 66 of 87

MAIN Register (00h)

NAME

Default

value

Active

Description

MAIN[7]

RXTX

RX/TX switch, 0: RX , 1: TX

MAIN[6]

F_REG

Selection of Frequency Register,

0: Register A, 1: Register B

MAIN[5:4]

PD_MODE[1:0]

Power down mode

0 (00): Receive Chain in power-down in TX, PA in power-down in

1 (01): Receive Chain and PA in power-down in both TX and RX

2 (10): Individual modules can be put in power-down by

programming the POWERDOWN register

3 (11): Automatic power-up sequencing is activated (see below)

MAIN[3]

FS_PD

Power Down of Frequency Synthesizer

MAIN[2]

XOSC_PD

Power Down of Crystal Oscillator Core

MAIN[1]

BIAS_PD

Power Down of BIAS (Global Current Generator) and Crystal

Oscillator Buffer

MAIN[0]

RESET_N

Reset, active low. Writing RESET_N low will write default values to

all other registers than MAIN. Bits in MAIN do not have a default

value and will be written directly through the configuration

interface. Must be set high to complete reset.

MAIN Register (00h) when using automatic power-up sequencing (RXTX = 0, PD_MODE[1:0] =11)

NAME

Default

value

Active

Description

MAIN[7]

RXTX

Automatic power-up sequencing only works in RX (RXTX=0)

MAIN[6]

F_REG

Selection of Frequency Register, 0: Register A, 1: Register B

MAIN[5:4]

PD_MODE[1:0]

Set PD_MODE[1:0]=3 (11) to enable sequencing

MAIN[3:2]

SEQ_CAL[1:0]

Controls PLL calibration before re-entering power-down

0: Never perform PLL calibration as part of sequence

1: Always perform PLL calibration at end of sequence

2: Perform PLL calibration at end of every 16

th sequence

3: Perform PLL calibration at end of every 256

th sequence

MAIN[1]

SEQ_PD

↑

↑1: Put the chip in power down and wait for start of new power-up

sequence

MAIN[0]

RESET_N

Reset, active low. Writing RESET_N low will write default values to

all other registers than MAIN. Bits in MAIN do not have a default

value and will be written directly through the configuration

interface. Must be set high to complete reset.

CC1021 Datasheet(PDF) 66 Page - Texas Instruments

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