Registers
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SRCEXTEN1 (0x6187) – Extended Address Matching
Bit Name Reset R/W Description
No.
7:0
EXT_ADDR_EN[15:8]
0x00 R/W
The 15:8 part of the 24-bit word EXT_ADDR_EN. See previous description
of SRCEXTEN0.
SRCEXTEN2 (0x6188) – Extended Address Matching
Bit Name Reset R/W Description
No.
7:0
EXT_ADDR_EN[23:16]
0x00 R/W
The 23:16 part of the 24-bit word EXT_ADDR_EN. See previous
description of SRCEXTEN0.
FRMCTRL0 (0x6189) – Frame Handling
Bit Name Reset R/W Description
No.
7
APPEND_DATA_MODE
0 R/W
When AUTOCRC = 0: Don't care
When AUTOCRC = 1:
0: RSSI + The CRC_OK bit and the 7-bit correlation value are
appended at the end of each received frame
1: RSSI + The CRC_OK bit and the 7-bit SRCRESINDEX are
appended at the end of each received frame. See Table 23-1 for
details.
6
AUTOCRC
1 R/W 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 last 2 bytes to
TXBUF.
0: No CRC-16 is appended to the frame. The last 2 bytes of the frame
must be generated manually and written to TXBUF (if not,
TX_UNDERFLOW occurs).
In RX
1: The CRC-16 is checked in hardware, and replaced in the RXFIFO
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).
5
AUTOACK
0 R/W Defines whether the radio 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
4
ENERGY_SCAN
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
3:2
RX_MODE[1:0]
00 R/W Set RX modes
00: Normal operation, use RXFIFO.
01: Reserved
10: RXFIFO looping ignores 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 not desired
to find symbol.
1:0
TX_MODE[1:0]
00 R/W Set test modes for TX
00: Normal operation, transmit TXFIFO
01: Reserved. Should not be used
10: TXFIFO looping ignores underflow in TXFIFO and reads cyclically;
infinite transmission.
11: Send pseudorandom data from CRC, infinite transmission.
270
CC253x Radio SWRU191C–April 2009–Revised January 2012
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