AT86RF230_09 ATMEL [ATMEL Corporation], AT86RF230_09 Datasheet - Page 18

• Manufacturer Part Number: AT86RF230_09
• Description: Low Power 2.4 GHz Transceiver for ZigBee, IEEE 802.15.4, 6LoWPAN, RF4CE and ISM
• Manufacturer: ATMEL [ATMEL Corporation]

Table 6-7. SLP_TR Multi-Functional Pin
Figure 6-15. Sleep and Wake-up Initiated by Asynchronous Microcontroller Timer Output (for Timing Information see
Table 7-1)
18
CLKM
SLP_TR
Radio Transceiver Status
TRX_OFF
SLEEP
RX_ON
RX_ON_NOCLK
RX_AACK_ON
RX_AACK_ON_NOCLK
PLL_ON
TX_ARET_ON
AT86RF230
Function
Sleep
Wakeup
Disable CLKM
Enables CLKM
Disable CLKM
Enables CLKM
TX start
TX start
35 main clock cycles
In states PLL_ON and TX_ARET_ON, the SLP_TR pin is used as trigger input to
initiate a TX transaction. Here pin SLP_TR is sensitive on rising edge only.
After initiating a state change by a rising edge at pin SLP_TR in radio transceiver states
TRX_OFF, RX_ON or RX_AACK_ON the radio transceiver remains in the new state as
long as the pin is logical high and returns to the preceding state with the falling edge.
The SLEEP state is used when radio transceiver functionality is not required, and thus
the AT86RF230 can be powered down to reduce the overall power consumption.
A power-down scenario is shown in Figure 6-15. When the radio transceiver is in
TRX_OFF state the microcontroller force the AT86RF230 to SLEEP by setting
SLP_TR = H. If the CLKM output provides a clock to the microcontroller this clock is
switched off after 35 clock cycles. This enables a microcontroller in a synchronous
system to complete its power-down routine and prevent dead-lock situations. The
AT86RF230 awakes when the microcontroller releases pin SLP_TR. This concept
provides the lowest possible power consumption.
For synchronous systems, where CLKM is used as a microcontroller clock source and
the SPI master clock (SCLK) is directly derived from CLKM, the AT86RF230 supports
an additional power-down mode for receive operating states RX_ON and
RX_AACK_ON.
If an incoming frame is expected and no other applications are running on the
microcontroller, it can be powered down without missing incoming frames.
Transition
L
H
L
H
L
H
L
L
H
H
H
H
H
L
L
L
Description
Takes the radio transceiver into SLEEP state
Takes the radio transceiver into TRX_OFF state
Takes the radio transceiver into RX_ON_NOCLK state and disables
CLKM
Takes the radio transceiver into RX_ON state and enables CLKM
Takes the radio transceiver into RX_AACK_ON_NOCLK state and
disables CLKM
Takes the radio transceiver into RX_AACK_ON state and enables
CLKM
Starts frame transmission
Starts TX_ARET transaction
a s y n c t im e r ( m ic r o c o n t ro lle r ) e la p s e d
t
tTR2
TR2
5131E-MCU Wireless-02/09