CC2430-RTR1-F64 datasheet(179/234 Pages) TI

179 / 234 page

CC2430

CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A

Page 179 of 232

PPDU

Acknowledge

PPDU

ack = 12 s ym bol perio ds

ack = 1 2 - 30 s ym bol periods

backoffslot = 20 s ym bol periods

SLOTTED_ACK = 0

SLOTTED_ACK = 1

Figure 51: Acknowledge frame timing

14.20 Radio control state machine

CC2430 has a built-in state machine that is

used to switch between different operation

states (modes). The change of state is

done either by using command strobes or

by internal events such as SFD detected

in receive mode.

The radio control state machine states are

shown in Figure 52. The numbers in

brackets refer to the state number

readable in the FSMSTATE status register.

Reading the FSMSTATE status register is

primarily for test / debug purposes. The

figure assumes that the device is already

placed in the PM0 power mode.

Before using the radio in either RX or TX

mode, the voltage regulator and crystal

oscillator must be turned on and become

stable. The voltage regulator and crystal

oscillator startup times are given in the

section 7.4 on page 16.

The voltage regulator for the radio is

enabled by setting the RF register bit

RFPWR.RREG_RADIO_PD

high.

The

interrupt flag RFIF.IRQ_RREG_ON is set

to 1 when the voltage regulator has

powered-up.

The crystal oscillator is controlled through

the Power Management Controller. The

SLEEP.XOSC_STB bit indicates whether

the oscillator is running and stable or not

(see page 142). This SFR register can be

polled when waiting for the oscillator to

start.

For

test

purposes,

the

frequency

synthesizer (FS) can also be manually

calibrated and started by using the

STXCALN or ISTXCALN command strobe

(see section 0 and 0). This will not start a

transmission before a STXON command

strobe is issued. This is not shown in

Figure 52.

Enabling transmission is done by issuing a

STXON or STXONCCA command strobe.

Turning off RF can be accomplished by

using the SRFOFF command strobe.

After bringing the

CC2430 up to Power

Mode 0 (PM0) from a low-power mode

e.g. Power Mode 3 (PM3), all RF registers

will retain their values thus placing the chip

ready to operate at the correct frequency

and mode. Due to the very fast start-up

time,

CC2430 can remain in a low-power

mode until a transmission session is

requested.

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