參數(shù)資料
型號： XE8807AMI026TLF
廠商： Semtech
文件頁數(shù)： 8/143頁
文件大?。?/td> 0K
描述： IC MCU LOW PWR MTP FLASH 32-TQFP
標準包裝： 1
系列： XE880x
應用： 感測機
核心處理器： Coolrisc816?
程序存儲器類型： 閃存（11 kB）
控制器系列： XE8000
RAM 容量： 512 x 8
接口： UART，USRT
輸入/輸出數(shù)： 24
電源電壓： 2.4 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 32-TQFP
包裝： 標準包裝
供應商設備封裝： 32-TQFP（7x7）
產品目錄頁面： 585 (CN2011-ZH PDF)
配用： XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
其它名稱： XE8807AMI026DKR
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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