參數(shù)資料
型號(hào): XE8807AMI026TLF
廠商: Semtech
文件頁數(shù): 141/143頁
文件大小: 0K
描述: IC MCU LOW PWR MTP FLASH 32-TQFP
標(biāo)準(zhǔn)包裝: 1
系列: XE880x
應(yīng)用: 感測(cè)機(jī)
核心處理器: Coolrisc816?
程序存儲(chǔ)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(biāo)準(zhǔn)包裝
供應(yīng)商設(shè)備封裝: 32-TQFP(7x7)
產(chǎn)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
14-17
XE8806A/XE8807A
lost by lack of space in the FIFO (overrun error which sets the flag RfifRxFifoOverrun) or because the start
sequence of the next message is detected which resets the reception FIFO.
When the complete message is received, the start sequence detection interrupt may be enabled again
(RfifRxIrqEn = 001) and the sequence starts all over again.
14.12.1.3 Reception mode using Manchester coding
The protocol of the messages received is Manchester Mark. The start sequence of the message is protocol
violation. The messages are sent at a data rate of 20 kbit/s (40 kbaud/s in Manchester code). The following
paragraphs will show how to set-up the XE1201A, how to set-up the RF interface and how to handle the received
data.
14.12.1.3.1
XE1201A set-up
To set the XE1201A in reception mode, set the pin EN to 1 and the pin RXTX to 1. The bit synchronizer of the
XE1201A is not used since the RF interface automatically synchronizes to the bit rate. This means that the data
registers of the XE1201A can remain in the default settings shown in Table 14-20. However, in order to reduce the
power consumption, the XE1201A bit synchronizer can be switched off by writing the bits A(9:6) = 0101 as shown
in Table 14-22.
Register
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Register A
0
1
0
1
0
1
0
Register B
0
Register C
0
1
0
1
0
1
0
1
0
Table 14-22. XE1201A register set-up (see XE1201A datasheet for bit explanation)
14.12.1.3.2
RF interface set-up
Set-up the RF interface of the microcontroller circuit as a receiver (RfifEnRx = 1 and RfifEnTx = 0).
Assume that the RC clock frequency used in the microcontroller is 2.0 MHz. To select the correct baud rate of 20
kbit/s according to the equation in chapter 14.10 (attention: the baud rate is twice the bit rate in Manchester code),
fine*coarse=2.0e06/(16*40e3)=3.12. We can approximate this at 3, which is close enough (see specification in
Table 14-19). This can be done by setting RfifBRCoarse = 00 and RfifBRFine = 0010.
The external bit synchronization clock is switched off by clearing the bit RfifRxClock = 0.
The decoder is enabled and set to Manchester Mark decoding by setting RfifEnCod = 1 and RfifPCM = 100.
The start detection by protocol violation is enabled by setting RfifEnStart = 01.
The start sequence detection interrupt is enabled by setting RfifRxIrqEn = 001.
The set-up of the interface is summarized in the Table 14-23.
Register
contents
RegRfifCmd1
00000010
RegRfifCmd2
10100100
RegRfifCmd3
00100010
Table 14-23. RF interface set-up
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