參數(shù)資料
型號: XE8801AMI000WP
廠商: Semtech
文件頁數(shù): 110/135頁
文件大?。?/td> 0K
描述: SENSING MACHINE WITH 16 + 10 BIT
標(biāo)準(zhǔn)包裝: 558
系列: XE880x
應(yīng)用: 感測機(jī)
核心處理器: Coolrisc816?
程序存儲器類型: 閃存(22 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: 模具
包裝: 托盤
配用: XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
其它名稱: Q2722595
Semtech 2005
www.semtech.com
14-4
XE8801A – SX8801R
Frequency selection for correct Uart
baud rate with RC oscillator (Hz)
2’457’600
1’843’200
1’228’800
614’400
For each of these frequencies, the baud rate can be selected with the bits UartBR(2:0) in RegUartCtrl and
UartRcSel(2:0) in RegUartCmd as shown in Table 14-8
RC frequency (Hz)
2’457’600
1’228’800
614’400
1’843’200
UartRcSel
010
001
000
111
38400
115200
110
19200
57600
101
9600
28800
UartBR
100
Not possible
4800
14400
Table 14-8: Uart baud rate with RC clock
Note: The precision of the baud rate is directly proportional to the frequency deviation of the used clock from the
ideal frequency given in the table. In order to increase the precision and stability of the RC oscillator, the DFLL
(digital frequency locked loop) can be used with the crystal oscillator as a reference.
14.5.2
Uart on the crystal oscillator
In order to use the crystal oscillator as the clock source for the Uart, the bit SelXtal in RegUartCmd has to be set.
The crystal oscillator has to be enabled by setting the EnableXtal bit in RegSysClock. The baud rate selection is
done using the UartBR and UartRcSel bits as shown in Table 14-9.
Xtal freq. (Hz)
UartRcSel
UartBR
Baud rate
011
2400
010
1200
001
600
32768
001
000
300
Table 14-9: Uart baud rate with Xtal clock
Due to the odd ratio between the crystal oscillator frequency and the baud rate, the generated baud rate has a
systematic error of –2.48%.
14.6
Function description
14.6.1
Configuration bits
The configuration bits of the Uart serial interface can be found in the registers RegUartCmd and RegUartCtrl.
The bit SelXtal is used to select the clock source (see chapter 14.5). The bits UartSelRc and UartBR select the
baud rate (see chapter 14.5).
The bit UartEnTx is used to enable or disable the transmission.
Not
Recommended
for
New
Designs
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