AT86RF233 datasheet(44/225 Pages) ATMEL

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MCU Wireless AT86RF233 [PRELIMINARY DATASHEET]

Atmel-8351E-MCU_Wireless-AT86RF233_Datasheet_072014

7.1.4.5 BUSY_TX to RX_ON States

The transition from PLL_ON to BUSY_TX state and subsequently to RX_ON state is

shown in Figure 7-7.

Figure 7-7. PLL_ON to BUSY_TX to RX_ON Timing.

Time [µs]

x + 32

Time

tTR11

tTR10

Command

RX_ON

State

Block

PLL_ON

RX_ON

BUSY_TX

SLP_TR

PLL

PA, TX

PLL

or command TX_START

Starting from PLL_ON state, it is further assumed that the PLL has already been

locked. A transmission is initiated either by a rising edge of pin 11 (SLP_TR) or by

command TX_START. The PLL settles to the transmit frequency and the PA is

enabled. After the duration of tTR10 = 16µs, the Atmel AT86RF233 changes into

BUSY_TX state, transmitting the internally generated SHR and the PSDU data of the

Frame

Buffer.

After

completing

the

frame

transmission,

indicated

IRQ_3 (TRX_END), the PLL settles back to the receive frequency within tTR11 = 32µs

and returns to state PLL_ON.

If during BUSY_TX the radio transmitter is requested to change to a receive state, it

automatically proceeds to state RX_ON upon completion of the transmission.

7.1.4.6 Reset Procedure

The radio transceiver reset procedure is shown in Figure 7-8.

Figure 7-8. Reset Procedure.

Event

State

Block

Time [μs]

Pin /RST

TRX_OFF

x + 30

[IRQ_4 (AWAKE_END)]

various

Time

>t10

tTR13

>t11

XOSC, DVREG

x + 10

FTN

Note:

1. Timing figure tTR13 refers to Table 7-1, t10, t11 refers to Section 12.4.

/RST = L sets all registers to their default values. Exceptions are register bits

CLKM_CTRL (register 0x03, TRX_CTRL_0), refer to Section 9.6.4. After releasing the

reset pin 8 (/RST) = H, the wake-up sequence including an FTN calibration cycle is

performed, refer to Section 9.8. After that the TRX_OFF state is entered.

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