CC2400-RTR1 datasheet(35/84 Pages) TI

35 / 84 page

CC2400

SWRS042A

Page 35 of 83

All calib done &

fs in lock

[12]

TX_OFF

[13]

STROBE

[17]

STROBE

TX_OFF

[18]

BEFORE_IDLE

[24]

[10]

STROBE

[16]

RX_OFF

[11]

FS_ON

[9]

STROBE

FS_ON

[15]

OFF

[0]

IDLE

[1]

SXOSCON &

Osc. settled

STROBE

RXTX_CAL

[14]

RXTX_CAL

[8]

SXOSCOFF

RX=TX=1

All calib done &

fs in lock

RX=0

TX=0

RX=TX=0 |

RX=TX=1

RX=TX=0

Immediately

SRX | STX | SFSON

STX

TX=0 |

RX=1 | packet done

TX=1 |

RX=0 | packet done

RX=TX=0 |

RX=TX=1

SFSON

SFSON | packet

done

SRFOFF|

SRFOFF

SFSON | packet done

SRX

Figure 15. Radio control state diagram (

FSMSTATE.FSM_CUR_STATE[4:0] value in

brackets)

Figure 15 shows a state transition diagram

for the radio control state machine. This

figure shows the possibilities that exist for

changing between states. Note for

example that it is not possible to go from

IDLE mode back to OFF. This diagram

can be very useful for debugging what is

happening within the

CC2400 by reading

FSMSTATE.FSM_CUR_STATE[4:0].

If invalid parameters are used during

development or testing, the PLL may not

lock after calibration. If this happens, the

CC2400 will get stuck in the

STROBE_RXTX_CAL state. The chip

must then be reset to exit this state. This

should never happen in an actual

application as long as recommended

Also note that the frequency register

FSDIV should only be modified when the

CC2400 is in IDLE mode, otherwise the

PLL may go out of lock since calibration is

only performed when exiting the IDLE

state

CC2400-RTR1 数据表(PDF) 35 Page - Texas Instruments

CC2400-RTR1 数据表(HTML) 35 Page - Texas Instruments

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CC2400-RTR1 数据表(PDF) 35 Page - Texas Instruments

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