参数资料
型号: XE8806AMI026TLF
厂商: Semtech
文件页数: 15/143页
文件大小: 0K
描述: IC MCU LOW PWR MTP FLASH 32-TQFP
标准包装: 1
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: 32-TQFP
包装: 剪切带 (CT)
供应商设备封装: 32-TQFP(7x7)
配用: XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
其它名称: XE8806AMI026CT
Semtech 2006
www.semtech.com
15-4
XE8806A/XE8807A
In order to obtain a correct baud rate, the RC oscillator or external clock frequency have to be set to one of the
frequencies given in the table below. The precision of the obtained baud rate is directly proportional to the
frequency deviation of the used clock source with respect to the values in the table below.
Frequency selection for correct Uart baud rates
RC oscillator (Hz)
External clock (Hz)
2’457’600
4’915’200
1’228’800
2’457’600
614’400
1’228’800
307’200
614’400
153’600
307’200
76’800
153’600
Table 15-9a
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 15-9.
RC frequency (Hz)
2457600
1228800
614400
307200
153600
76800
External clock freq. (Hz)
4915200
2457600
1228800
614400
307200
153600
UartRcSel
UartBR
111
153600
76800
38400
19200
9600
4800
110
76800
38400
19200
9600
4800
2400
101
38400
19200
9600
4800
2400
1200
100
19200
9600
4800
2400
1200
600
011
9600
4800
2400
1200
600
300
010
4800
2400
1200
600
300
-
001
2400
1200
600
300
-
000
1200
600
300
-
001
600
300
-
010
000
300
-
Table 15-9: Uart baud rate with RC clock or external clock
Note 1 : Although not documented here, the coding of the baud rate used in the circuits XE8801, XE8803 and
XE8805 can also be used.
Note 2 : 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.
15.7
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 bits as shown in Table 15-10.
Xtal freq. (Hz)
32768
UartBR
011
2400
010
1200
001
600
000
300
Table 15-10: UART baud rate with Xtal clock
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XE8807AMI026TLF 功能描述:IC MCU LOW PWR MTP FLASH 32-TQFP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器 - 特定应用 系列:XE880x 产品变化通告:Product Discontinuation 26/Aug/2009 标准包装:250 系列:- 应用:网络处理器 核心处理器:4Kc 程序存储器类型:- 控制器系列:- RAM 容量:16K x 8 接口:以太网,UART,USB 输入/输出数:- 电源电压:1.8V, 3.3V 工作温度:- 安装类型:表面贴装 封装/外壳:208-LQFP 包装:带卷 (TR) 供应商设备封装:PG-LQFP-208 其它名称:SP000314382