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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
Pin
SLP_TR
0
16
x
x + 32 Time [μs]
State
PLL_ON
BUSY_TX
RX_ON
Block
PLL
PA
PA, TX
PLL
RX
Command
Time
or command TX_START
t TR10
RX_ON
t TR11
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.
t 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
0
x
x + 10
x + 40
Time [μs]
Event
[ IRQ_4 (AWAKE_END) ]
State
various
TRX_OFF
Block
XOSC, DVREG
FTN
XOSC, DVREG
Pin /RST
Time
>t10
>t11
t TR13
Note:
Timing figure t TR13 refers to Table 7-1 on page 42 , t 10 , t 11 refers to Section 12.4 “Digital Interface
Timing Characteristics” on page 157 .
41
8111C–MCU Wireless–09/09
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