Texas Instruments 3138 155 232931 manual Radio control states

CC2420

	Voltage Regulator Off	VREG_EN set low
	VREG_EN set high
	Wait until voltage regulator
	has powered up
	Chip Reset
SXOSCOFF	(pin or register)
		Crystal oscillator disabled,
command strobe	Power Down (PD)
All States	[0]	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	SRFOFF				IDLE
except Power Down (PD)								[1]
					R	X	O	N
				S
				RX_CALIBRATE
				[2 and 40]
				12 symbol periods				T
								a
				later				r
								m
								n
								s
			X					i
								s
								si
		HR
	US							o
FL				RX_SFD_SEARCH
S								n
				[3, 4, 5 and 6]				o
								c

All RX states

S

r

n

d

T

o

a

X

N

A

N

O

X

O

C

C

)

T

N

A

S

O

C

T

X

C

S

(

TX_CALIBRATE

[32]

8 or 12 symbol

periods later

TX_PREAMBLE

Preamble and SFD

[34, 35 and 36]

is transmitted

						SFD
	Frame received or					found
	failed address
RX_WAIT	recognition					RX_FRAME
[14]						[16 and 40]
				w
			o
		fl
	v	r			Automatic or manual
	e
	O				acknowledge request
RX_OVERFLOW						TX_ACK_CALIBRATE
	[17]					[48]

SACK or SACKPEND

m

p l e t e d

TX_FRAME	TXFIFO Data
[37, 38 and 39]	is transmitted

Underflow

TX_UNDERFLOW

[56]

12 symbol	The transition from
periods later	TX_UNDERFLOW to
	RX_CALIBRATE is automatic,
TX_ACK_PREAMBLE	but SFLUSHTX must be used to
[49, 50 and 51]	reset underflow indication

Acknowledge

completed

TX_ACK

[52, 53 and 54]

Figure 25. Radio control states

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