參數(shù)資料
型號: XE8000EV108
廠商: Semtech
文件頁數(shù): 8/143頁
文件大?。?/td> 0K
描述: EVAL BOARD FOR XE8806/XE8807
標準包裝: 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
14-25
XE8806A/XE8807A
14.12.2.5 Transmission mode using NRZ coding
This RF link uses a wide band transmission in the 915MHz frequency band. The protocol of the messages to be
sent is NRZ Level. The start sequence of the message is a 4 byte pattern (10101010 10101010 10101010
11010100). The messages have a data rate of 76.8 kbit/s with a frequency deviation of 100 kHz. The output power
is 0 dBm. The following paragraphs will show how to set-up the XE1202A, how to set-up the RF interface and how
to handle the received data.
14.12.2.5.1
XE1202A set-up
To set the XE1202A in transmission mode, set the pins MODE(2:0) = 111.
To select the 915MHz band, the bits FSParam_band = 11. The frequency deviation is set to 100kHz by writing
RTParam_Dev = 11. The baud rate is set to 76.8 kbit/s by writing FSParam_BR = 100. The output power is set to 0
dBm by writing RTParam_Tpow = 00. The setup of the XE1202a is shown in Table 14-31.
Register
Register Address
7
6
5
4
3
2
1
0
RTParam1
00000
0
RTParam2
00001
0
1
0
FSParam1
00010
1
0
1
0
FSParam2
00011
0
FSParam3
00100
0
DataOut
00101
0
ADParam1
00110
0
ADParam2
00111
0
Pattern1
01000
0
Pattern2
01001
0
Pattern3
01010
0
Pattern4
01011
0
Table 14-31. XE1202A register set-up (see XE1202A datasheet for bit explanation)
14.12.2.5.2
RF interface set-up
We then 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 1.2 MHz. To select the correct baud rate of 76.8
kbit/s according to the equation in chapter 14.10, fine*coarse=1.2e06/(16*76.8e3)=0.98. We can approximate this
at 1 (see specification in Table 14-19). This can be done by setting RfifBRCoarse = 00 and RfifBRFine = 0000.
The external bit synchronization clock is switched off by clearing the bit RfifTxClock = 0.
The encoder is enabled and set to NRZ Level encoding by setting RfifEnCod = 1 and RfifPCM = 000.
The set-up of the interface is summarized in the Table 14-32.
Register
contents
RegRfifCmd1
00000000
RegRfifCmd2
00100010
RegRfifCmd3
00000001
Table 14-32. RF interface set-up
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