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AT86RF232
On write access, the second byte transferred on MOSI contains the write data to the
selected address (see Figure 6-5 ).
Figure 6-5. Packet Structure - Register Write Access.
byte 1 (command byte)
byte 2 (data byte)
MOSI
MISO
1
1
ADDRESS[5:0]
PHY_STATUS
WRITE DATA[7:0]
XX
Each register access must be terminated by setting /SEL = H.
Figure 6-6 illustrates a typical SPI sequence for a register access sequence for write
and read respectively.
Figure 6-6. Example SPI Sequence – Register Access Mode.
/SEL
SCLK
Register Write Access
Register Read Access
MOSI
MISO
WRITE COMMAND
PHY_STATUS
WRITE DATA
XX
READ COMMAND
PHY_STATUS
XX
READ DATA
6.2.2 Frame Buffer Access Mode
The Atmel AT86RF232 128-byte Frame Buffer can hold the PHY service data unit
(PSDU) data of one IEEE 802.15.4 compliant RX or one TX frame of maximum length
at a time. A detailed description of the Frame Buffer can be found in Section 9.3 . An
introduction to the IEEE 802.15.4 frame format can be found in Section 8.1 .
Frame Buffer read and write accesses are used to read or write frame data (PSDU and
additional information) from or to the Frame Buffer. Each access starts with /SEL = L
followed by a command byte on MOSI. If this byte indicates a frame read or write
access, the next byte PHR indicates the frame length followed by the PSDU data, see
Figure 6-7 and Figure 6-8 .
On Frame Buffer read access, PHY header (PHR) and PSDU are transferred via MISO
starting with the second byte. After the PSDU data, three more bytes are transferred
containing the link quality indication (LQI) value, the energy detection (ED) value, and
the status information (RX_STATUS) of the received frame, for LQI details refer to
Section 8.6 . The Figure 6-7 illustrates the packet structure of a Frame Buffer read
access.
Figure 6-7. Packet Structure - Frame Read Access.
byte 1 (command byte)
byte 2 (data byte)
byte 3 (data byte)
byte n-1 (data byte)
byte n (data byte)
MOSI
MISO
0 0 1 reserved[4:0]
PHY_STATUS
XX
PHR[7:0]
XX
PSDU[7:0]
XX
ED[7:0]
XX
RX_STATUS[7:0]
17
8321A – MCU Wireless – 10/11
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