參數(shù)資料
型號： XE8000EV108
廠商： Semtech
文件頁數(shù)： 143/143頁
文件大?。?/td> 0K
描述： EVAL BOARD FOR XE8806/XE8807
標(biāo)準(zhǔn)包裝： 1
類型： MCU
適用于相關(guān)產(chǎn)品： XE88LC06AMI026
所含物品： 完全組裝的評估板
產(chǎn)品目錄頁面： 585 (CN2011-ZH PDF)
Semtech 2006
www.semtech.com
14-19
XE8806A/XE8807A
14.12.1.4.3
Data transmission
To handle the transmission data by interrupt, enable the RF interface transmission interrupt in the interrupt handler
of the circuit.
We need to send the start sequence (preamble) first. The start sequence is defined as 4 bytes of “01010101”.
Since the NRZ Space encoder is enabled, four bytes of “00000000” should be written to the register RegRfifTx.
After encoding, this will correspond to 4 bytes of “01010101”. The FIFO is now full, and we can wait for the
interrupt, which will indicate that the FIFO is empty.
At occurrence of the interrupt, 4 bytes of the message can be written to the FIFO until all message bytes are sent.
14.12.1.5 Transmission mode using Miller code
The messages have to be encoded using the Miller code. The start sequence of the message is a protocol
violation. The messages are sent at a data rate of 5 kbit/s (or 10 kbaud/s in Miller code) and the modulator
frequency deviation is 25kHz and the output power is +5dbm.
The following paragraphs will show how to set-up the XE1201A, how to set-up the RF interface and how to handle
the transmission data.
14.12.1.5.1
XE1201A set-up
To set the XE1201A in transmission mode, set the pin EN to 1 and the pin RXTX to 0. The modulator deviation
frequency is set to 23.4kHz by writing C(6:0) = 0000110. The output power is set to +5dbm by writing C(13:12) =
11. All other values remain default. The resulting register values are shown in Table 14-25.
Register
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Register A
0
1
0
Register B
0
Register C
1
0
1
0
1
0
1
0
Table 14-25. XE1201A register set-up (see XE1201A datasheet for bit explanation)
14.12.1.5.2
RF interface set-up
Set-up the RF interface of the microcontroller circuit as a transmitter (RfifEnRx = 0 and RfifEnTx = 1).
Assume that the RC clock frequency used in the microcontroller is 2.0 MHz. To select the correct baud rate of 5
kbit/s according to the equation in chapter 14.10 (attention: the baud rate is twice the bit rate in the Miller code),
fine*coarse=2.0e06/(16*10e3)=12.5. We can approximate this at 12, which gives us a data rate of 5.2 kbit/s. This
can be done by setting RfifBRCoarse = 01 and RfifBRFine = 0010. If a data rate closer to the 5kbit/s target, the
RC oscillator frequency could be slightly increased to 1.04 MHz which gives fine*coarse=13.
The external bit synchronization clock is switched off by clearing the bit RfifTxClock = 0.
The encoder is enabled and set to Miller encoding by setting RfifEnCod = 1 and RfifPCM = 111.
The set-up of the interface is summarized in Table 14-26.
Register
contents
RegRfifCmd1
00010010
RegRfifCmd2
00100111
RegRfifCmd3
00000001
Table 14-26. RF interface set-up
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