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ATMEGA8L-8MUR 参数 Datasheet PDF下载

ATMEGA8L-8MUR图片预览
型号: ATMEGA8L-8MUR
PDF下载: 下载PDF文件 查看货源
内容描述: 8位爱特梅尔带有8K字节的系统内可编程闪存 [8-bit Atmel with 8KBytes In-System PRogrammable Flash]
分类和应用: 闪存微控制器和处理器外围集成电路异步传输模式PCATM时钟
文件页数/大小: 331 页 / 6705 K
品牌: ATMEL [ ATMEL ]
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ATmega8(L)  
Asynchronous  
Operational Range  
The operational range of the Receiver is dependent on the mismatch between the received bit  
rate and the internally generated baud rate. If the Transmitter is sending frames at too fast or too  
slow bit rates, or the internally generated baud rate of the Receiver does not have a similar (see  
Table 53) base frequency, the Receiver will not be able to synchronize the frames to the start bit.  
The following equations can be used to calculate the ratio of the incoming data rate and internal  
Receiver baud rate.  
D + 2S  
D + 1S + S  
D + 1S  
S 1 + D S + S  
R
= -----------------------------------  
R
= ------------------------------------------  
fast  
slow  
M
F
D
Sum of character size and parity size (D = 5-bit to 10-bit)  
S
Samples per bit. S = 16 for Normal Speed mode and S = 8 for Double Speed mode  
SF  
First sample number used for majority voting. SF = 8 for Normal Speed and SF = 4 for  
Double Speed mode  
SM Middle sample number used for majority voting. SM = 9 for Normal Speed and SM = 5 for  
Double Speed mode  
Rslow is the ratio of the slowest incoming data rate that can be accepted in relation to the  
Receiver baud rate. Rfast is the ratio of the fastest incoming data rate that can be  
accepted in relation to the Receiver baud rate  
Table 53 and Table 54 list the maximum Receiver baud rate error that can be tolerated. Note  
that Normal Speed mode has higher toleration of baud rate variations.  
Table 53. Recommended Maximum Receiver Baud Rate Error for Normal Speed Mode  
(U2X = 0)  
D#  
Rslow  
(%)  
Rfast  
(%)  
Max Total  
Error (%)  
Recommended Max  
Receiver Error (%)  
(Data + Parity Bit)  
5
6
93.20  
94.12  
94.81  
95.36  
95.81  
96.17  
106.67  
105.79  
105.11  
104.58  
104.14  
103.78  
+6.67/-6.8  
+5.79/-5.88  
+5.11/-5.19  
+4.58/-4.54  
+4.14/-4.19  
+3.78/-3.83  
3.0  
2.0  
2.0  
2.0  
1.5  
1.5  
7
8
9
10  
Table 54. Recommended Maximum Receiver Baud Rate Error for Double Speed Mode  
(U2X = 1)  
D#  
Rslow  
(%)  
Rfast  
(%)  
Max Total  
Error (%)  
Recommended Max  
Receiver Error (%)  
(Data + Parity Bit)  
5
6
94.12  
94.92  
95.52  
96.00  
96.39  
96.70  
105.66  
104.92  
104.35  
103.90  
103.53  
103.23  
+5.66/-5.88  
+4.92/-5.08  
+4.35/-4.48  
+3.90/-4.00  
+3.53/-3.61  
+3.23/-3.30  
2.5  
2.0  
1.5  
1.5  
1.5  
1.0  
7
8
9
10  
144  
2486AA–AVR–02/2013  
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