CC2520_11 Datasheet, PDF (109/133 Pages) Texas Instruments – 2.4 GHZ IEEE 802.15.4/ZIGBEE RF TRANSCEIVER

CC2520 DATASHEET
2.4 GHZ IEEE 802.15.4/ZIGBEE® RF TRANSCEIVER
SWRS068 – DECEMBER 2007
FRMCTRL0, A 0x00C, R 0x40, Frame handling
Bit no. Bit mnemonic
7
APPEND_DATA_MODE
6
AUTOCRC
Reset
value
0
1
Mode
R/W
R/W
Description
When AUTOCRC = 0:Don’t care
When AUTOCRC = 1:
0: RSSI + The crc_ok bit and the 7 bit correlation value is
appended at the end of each received frame
1: RSSI + The crc_ok bit and the 7 bit SRCRESINDEX is
appended at the end of each received frame. See Table 15 for
details.
In TX:
1: A CRC-16 (ITU-T) is generated in hardware and appended to
the transmitted frame. There is no need to write the two last bytes
to TXBUF.
0: No CRC-16 is appended to the frame. The two last bytes of the
frame must be generated manually and written to TXBUF (if not,
TX_UNDERFLOW will occur).
5
AUTOACK
4
ENERGY_SCAN
3:2
RX_MODE[1:0]
1:0
TX_MODE[1:0]
In RX
1: The CRC-16 is checked in hardware, and replaced in the RX
FIFO by a 16-bit status word which contains a CRC OK bit. The
status word is controllable through APPEND_DATA_MODE
0: The last two bytes of the frame (crc-16 field) are stored in the
RXFIFO. The CRC check (if any) must be done manually.
Note that this setting does not influence acknowledgment
transmission (including AUTOACK)
0
R/W Defines whether CC2520 automatically transmits acknowledge
frames or not. When autoack is enabled, all frames that are
accepted by address filtering, have the acknowledge request flag
set and have a valid CRC, are automatically acknowledged 12
symbol periods after being received.
0 - Autoack disabled
1 - Autoack enabled
0
R/W Defines whether the RSSI register contains the most recent signal
strength or the peak signal strength since the energy scan was
enabled.
0 - Most recent signal strength
1 - Peak signal strength
00
R/W Set RX modes
00: Normal operation, use RXFIFO.
01: Reserved
10: RXFIFO looping ignore overflow in RXFIFO, infinite reception.
11: Same as normal operation except that symbol search is
disabled. Can be used for RSSI or CCA measurements when it is
undesired to find symbol.
00
R/W Set test modes for TX
00: Normal operation, transmit TXFIFO
01: Reserved. Should not be used.
10: TXFIFO looping ignore underflow in TXFIFO and read cyclic,
infinite transmission.
11: Send pseudo random data from CRC, infinite transmission.
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