参数资料
型号: XE8805AMI028LF
厂商: Semtech
文件页数: 132/156页
文件大小: 0K
描述: IC DAS 16BIT FLASH 8K MTP 64LQFP
标准包装: 160
系列: XE880x
应用: 感测机
核心处理器: Coolrisc816?
程序存储器类型: 闪存(22 kB)
控制器系列: XE8000
RAM 容量: 512 x 8
接口: UART,USRT
输入/输出数: 24
电源电压: 2.4 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 64-LQFP
包装: 托盘
供应商设备封装: 64-LQFP(10x10)
产品目录页面: 585 (CN2011-ZH PDF)
配用: XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
Semtech 2006
www.semtech.com
14-4
XE8805/05A
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 bits UartEnTx is used to enable or disable the transmission.
The bits UartEnRx1 and UartEnRx2 are used to enable or disable the reception. When one is set to 1, the
reception is enabled.
Not
Recommended
for
New
Designs
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