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If during TX_BUSY the radio transmitter is programmed to change to a receive state it
automatically 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 .
Figure 7-7. Reset Procedure.
0
x
x + 10
x + 30
Time [ μ s]
Event
[ IRQ_4 (AWAKE_END) ]
State
various
TRX_OFF
Block
XOSC, DVREG
FTN
XOSC, DVREG
Pin /RST
Time
>t 10
>t 11
t TR13
Note:
1.
Timing figure t TR13 refers to Table 7-1 , t 10 , t 11 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.
Figure 7-7 illustrates the reset procedure once the P_ON state was left and the radio
transceiver was not in SLEEP state.
The reset procedure is identical for all originating radio transceiver states except of
state P_ON, or SLEEP. Instead, here the procedure described in Section 7.1.2.1 must
be followed to enter the TRX_OFF state.
If the radio transceiver was in state SLEEP, the XOSC and DVREG are enabled before
entering TRX_OFF state.
If register bits TRX_STATUS indicates STATE_TRANSITION_IN_PROGRESS during
system initialization until the Atmel AT86RF232 reaches TRX_OFF state, do not try to
initiate a further state change while the radio transceiver is in this state.
38
AT86RF232
Notes:
2.
3.
4.
The reset impulse should have a minimum length t 10 = 625ns as specified in
Section 12.4 .
An access to the device should not occur earlier than t 11 ≥ 625ns after releasing
the /RST pin; refer to Section 12.4 .
A reset overrides an SPI command request that might have been queued.
8321A – MCU Wireless – 10/11
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