
42
8111C–MCU Wireless–09/09
AT86RF231
/RST = L sets all registers to their default values. Exceptions are register bits CLKM_CTRL (reg-
After releasing the reset pin (/RST = H) the wake-up sequence including an FTN calibration
the TRX_OFF state is entered.
transceiver was not in SLEEP state.
The reset procedure is identical for all originating radio transceiver states except of state P_ON
If the radio transceiver was in SLEEP state, the XOSC and DVREG are enabled before entering
TRX_OFF state.
If register TRX_STATUS indicates STATE_TRANSITION_IN_PROGRESS during system initial-
ization until the AT86RF231 reaches TRX_OFF, do not try to initiate a further state change while
the radio transceiver is in this state.
Notes
The reset impulse should have a minimum length t
An access to the device should not occur earlier than t
11
625 ns after releasing the pin
12.4.14.
A reset overrides an SPI command request that might be queued.
7.1.4.6
State Transition Timing Summary
Table 7-1.
State Transition Timing
No
Symbol
Transition
Time [s], (type)
Comments
1t
TR1
P_ON
until CLKM
available
330
Depends on external capacitor at DVDD (1 F nom) and crystal
oscillator setup (CL = 10 pF)
2t
TR2
SLEEP
TRX_OFF
380
Depends on external capacitor at DVDD (1 F nom) and crystal
oscillator setup (CL = 10 pF)
TRX_OFF state indicated by IRQ_4 (AWAKE_END)
3t
TR3
TRX_OFF
SLEEP
35*1/f
CLKM
For f
CLKM > 250 kHz
4
t
TR4
TRX_OFF
PLL_ON
110
Depends on external capacitor at AVDD (1 F nom)
5t
TR5
PLL_ON
TRX_OFF
1
6t
TR6
TRX_OFF
RX_ON
110
Depends on external capacitor at AVDD (1 F nom)
7t
TR7
RX_ON
TRX_OFF
1
8t
TR8
PLL_ON
RX_ON
1
9t
TR9
RX_ON
PLL_ON
1
Transition time is also valid for TX_ARET_ON, RX_AACK_ON