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AT86RF231
7. Operating Modes
7.1
Basic Operating Mode
This section summarizes all states to provide the basic functionality of the AT86RF231, such as
receiving and transmitting frames, the power up sequence and sleep. The Basic Operating
Mode is designed for IEEE 802.15.4 and ISM applications; the corresponding radio transceiver
states are shown in Figure 7.1 on page 33 .
Figure 7-1.
Basic Operating Mode State Diagram (for timing refer to Table 7-1 on page 42 )
P_ON
(Power-on after V DD )
XOSC=ON
Pull=ON
SLEEP
(Sleep State)
XOSC=OFF
Pull=OFF
3
(from all states)
1
2
/RST = L
FORCE_TRX_OFF 12
(all states except SLEEP)
TRX_OFF
(Clock State)
XOSC=ON
13 /RST = H
(all states except P_ON)
RESET
Pull=OFF
6
7
5
4
BUSY_RX
SHR
Detected
RX_ON
8
RX_ON
PLL_ON
11
Frame
End
BUSY_TX
(Receive State)
Frame
End
(Rx Listen State)
PLL_ON 9
(PLL State)
10
SLP_TR = H
or
(Transmit State)
TX_START
FORCE_PLL_ON
14
RX_ON_NOCLK
(Rx Listen State)
(all states except SLEEP,
P_ON, TRX_OFF, RX_ON_NOCLK)
Legend:
Blue : SPI Write to Register TRX_STATE (0x02)
Red : Control signals via IC Pin
Green : Event
CLKM=OFF
X
Basic Operating Mode States
State transition number, see Table 7-1
7.1.1
State Control
The radio transceiver states are controlled either by writing commands to register bits
TRX_CMD (register 0x02, TRX_STATE), or directly by two signal pins: pin 11 (SLP_TR) and
33
8111C–MCU Wireless–09/09
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