CC2420 Datasheet, PDF (44/92 Pages) List of Unclassifed Manufacturers – 2.4 GHz IEEE 802.15.4 / ZigBee-ready RF Transceiver

CC2420
All States
Voltage Regulator Off
VREG_EN set low
VREG_EN set high
SXOSCOFF
command strobe
Wait until voltage regulator
has powered up
Chip Reset
(pin or register)
Power Down (PD)
[0]
Crystal oscillator disabled,
register access enabled,
FIFO / RAM access disabled
SXOSCON
Wait for the specified crystal oscillator
start-up time, or poll the
XOSC16M_STABLE status bit
All States
except Power Down (PD)
SRFOFF
IDLE
[1]
All RX states
RX_CALIBRATE
[2 and 40]
SFLUSHRX
12 symbol periods
later
RX_SFD_SEARCH
[3, 4, 5 and 6]
RX_WAIT
[14]
SFD
Frame received or
found
failed address
recognition
RX_FRAME
[16 and 40]
Overflow
Automatic or manual
acknowledge request
RX_OVERFLOW
[17]
TX_ACK_CALIBRATE
[48]
12 symbol
periods later
TX_ACK_PREAMBLE
[49, 50 and 51]
TX_ACK
[52, 53 and 54]
TX_CALIBRATE
[32]
8 or 12 symbol
periods later
TX_PREAMBLE
[34, 35 and 36]
Preamble and SFD
is transmitted
TX_FRAME
[37, 38 and 39]
TXFIFO Data
is transmitted
Underflow
TX_UNDERFLOW
[56]
The transition from
TX_UNDERFLOW to
RX_CALIBRATE is automatic,
but SFLUSHTX must be used to
reset underflow indication
Acknowledge
completed
Figure 25. Radio control states
SWRS041B
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