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Appendix A - Continuous Transmission Test Mode
A.1 - Overview
The Atmel AT86RF232 offers a Continuous Transmission Test Mode to support final
application / production tests as well as certification tests. Using this test mode the radio
transceiver transmits continuously a previously transferred frame (PRBS mode) or a
continuous wave signal (CW mode).
In CW mode two different signal frequencies per channel can be transmitted:
? f 1 = Fc + 0.5MHz
? f 2 = Fc - 0.5MHz
Here Fc is the channel center frequency, refer to Section 9.7.2 .
Note:
1.
In CW mode it is not possible to transmit a RF signal directly on the channel
center frequency.
PSDU data in the Frame Buffer must contain at least a valid PHR (see Section 8.1 ). It is
recommended to use a frame of maximum length (127 bytes) and arbitrary PSDU data
for the PRBS mode. The SHR and the PHR are not transmitted. The transmission starts
with the PSDU data and is repeated continuously.
A.2 - Configuration
Before enabling Continuous Transmission Test Mode all register configurations shall be
done as follow:
? TX channel setting (optional)
? TX output power setting (optional)
? Mode selection (PRBS / CW)
A register access to register 0x36 and 0x1C enables the Continuous Transmission Test
Mode.
The transmission is started by enabling the PLL (TRX_CMD = PLL_ON) and writing the
TX_START command to register 0x02.
Even for CW signal transmission it is required to write valid PSDU data to the Frame
Buffer. For PRBS mode it is recommended to write a frame of maximum length.
The detailed programming sequence is shown in Table A-0-1 . The column R/W informs
about writing (W) or reading (R) a register or the Frame Buffer.
Table A -0-1. Continuou s Transmission Programming Sequence.
Step
Action
Register
R/W
Value
Description
1
RESET
Reset AT86RF232
2
Register Access
0x0E
W
0x01
Set IRQ mask register, enable
IRQ_0 (PLL_LOCK)
3
4
Register Access
Register Access
0x04
0x02
W
W
0x00
0x03
Disable TX_AUTO_CRC_ON
Set radio transceiver state
TRX_OFF
5
6
Register Access
Register Access
0x03
0x08
W
W
0x01
0x33
Set clock at pin 17 (CLKM)
Set IEEE 802.15.4 CHANNEL, for
example channel 19
164
AT86RF232
8321A – MCU Wireless – 10/11
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