AT86RF231 datasheet(41/180 Pages) ATMEL

41 / 180 page

8111A–AVR–05/08

AT86RF231

7.1.4.4

BUSY_TX and RX_ON States

The transition from PLL_ON to BUSY_TX state and subsequent to RX_ON state is shown in

Figure 7-6 on page 41.

Figure 7-6.

PLL_ON to BUSY_TX to RX_ON Timing

Starting from PLL_ON state it is further assumed that the PLL is already locked. A transmission

is initiated either by a rising edge of pin 11 (SLP_TR) or by command TX_START. The PLL set-

tles to the transmit frequency and the PA is enabled.

TR10 = 16 µs after initiating the transmission the AT86RF231 changes into BUSY_TX state and

the internally generated SHR is transmitted. After that the PSDU data are transmitted from the

Frame Buffer.

After completing the frame transmission, indicated by IRQ_3 (TRX_END), the PLL settles back

to the receive frequency within t

TR11 = 32 µs in state PLL_ON.

If during TX_BUSY the radio transmitter is programmed to change to a receive state it automati-

cally proceeds the state change to RX_ON state after finishing the transmission.

7.1.4.5

Reset Procedure

The radio transceiver reset procedure is shown in Figure 7-7 on page 41.

Figure 7-7.

Reset Procedure

Note:

Timing figure t

TR13 refers to Table 7-1 on page 42, t10, t11 refers to Section 12.4 “Digital Interface

Timing Characteristics” on page 157.

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

Event

State

Block

Time [µs]

Pin /RST

TRX_OFF

x + 40

[IRQ_4 (AWAKE_END)]

various

Time

>t10

tTR13

>t11

XOSC, DVREG

x + 10

FTN

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