AT86RF231
11.6
11.6.1
RX Frame Time Stamping
Overview
To determine the exact timing of an incoming frame, e.g. for beaconing networks, the reception
of this frame can be signaled to the microcontroller via pin 10 (DIG2). The pin turns from L to H
after a detection of a valid PHR. When enabled, DIG2 is set to DIG2 = H at the same time as
IRQ_2 (RX_START), even if IRQ_2 is disabled. The pin remains high for the length of the frame
receive procedure, see Figure 11-3 on page 130 .
Figure 11-12. Timing of RX_START and DIG2 for RX Frame Time Stamping
0
128
160
192
192 + m * 32
Time [μs]
Number of Octets
Frame Content
TRX_STATE
4
Preamble
RX_ON
1
SFD
1
PHR
m < 128
PSDU (250 kb/s)
BUSY_RX
RX_ON
DIG2 (RX Frame Time Stamp)
IRQ
Interrupt latency
IRQ_2 (RX_START)
t IRQ
TRX_END
t IRQ
Note:
Timing figures refer to 12.4 “Digital Interface Timing Characteristics” on page 157 .
This function is enabled with register bit IRQ_2_EXT_EN (register 0x04) set. Pin 10 (DIG2)
could be connected to a timer capture unit of the microcontroller.
If this pin is not used for RX Frame Time Stamping it can be configured for Antenna Diversity.
Otherwise this pin is pulled-down to digital ground.
150
8111C–MCU Wireless–09/09
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