184
7810C–AVR–10/12
Atmel ATmega328P [Preliminary]
The following equations can be used to calculate the ratio of the incoming data rate and internal
receiver baud rate.
D
Sum of character size and parity size (D = 5 to 10 bit)
S
Samples per bit. S = 16 for Normal Speed mode and S = 8 for Double Speed
mode.
S
F
First sample number used for majority voting. S
F = 8 for normal speed and
S
F = 4 for Double Speed mode.
S
M
Middle sample number used for majority voting. S
M = 9 for normal speed and
S
M = 5 for Double Speed mode.
R
slow
is the ratio of the slowest incoming data rate that can be accepted in relation to
the receiver baud rate. R
fast is the ratio of the fastest incoming data rate that can
be accepted in relation to the receiver baud rate.
Table 19-2 on page 184 and Table 19-3 on page 185 list the maximum receiver baud rate error
that can be tolerated. Note that Normal Speed mode has higher toleration of baud rate
variations.
Table 19-2.
Recommended Maximum Receiver Baud Rate Error for Normal Speed Mode
(U2Xn = 0)
D
# (Data+Parity Bit)
R
slow (%)
R
fast (%)
Max Total Error (%)
Recommended Max
Receiver Error (%)
5
93.20
106.67
+6.67/-6.8
± 3.0
6
94.12
105.79
+5.79/-5.88
± 2.5
7
94.81
105.11
+5.11/-5.19
± 2.0
8
95.36
104.58
+4.58/-4.54
± 2.0
9
95.81
104.14
+4.14/-4.19
± 1.5
10
96.17
103.78
+3.78/-3.83
± 1.5
Rslow
D 1
+
()S
S 1
DS
SF
++
-------------------------------------------
=
Rfast
D 2
+
()S
D 1
+
()SS
M
+
-----------------------------------
=
相关PDF资料
PIC24F08KL401-I/SO IC MCU 16BIT 8KB FLASH 20-SOIC
PIC18F13K50-I/MQ IC PIC MCU FLASH 512KX8 20-QFN
PIC16F1934-I/PT IC PIC MCU FLASH 256KX7 44-TQFP
PIC24F16KL402-I/SS IC MCU 16BIT 16KB FLASH 28-SSOP
PIC16LF1934-I/PT IC PIC MCU FLASH 256KX7 44-TQFP
PIC16C58B-20/P IC MCU OTP 2KX12 18DIP
PIC18F24K20-I/SP IC PIC MCU FLASH 8KX16 28-DIP
PIC16F1936-I/SP IC PIC MCU FLASH 512KX14 28SPDIP
相关代理商/技术参数
PIC16F1526-I/PT 制造商:Microchip Technology Inc 功能描述:IC 8BIT MCU PIC16F 20 MHz 64-TQFP 制造商:Microchip Technology Inc 功能描述:IC, 8BIT MCU, PIC16F, 20MHz, TQFP-64
PIC16F1526T-I/MR 功能描述:8位微控制器 -MCU 14KB FL 768B RAM 10bit ADC 1.8-5.5V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC16F1526T-I/PT 功能描述:8位微控制器 -MCU 14KB Flash RAM 768b nanoWatt RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC16F1527-E/MR 功能描述:8位微控制器 -MCU 28KB FL 1536B RAM 10bit ADC 1.8-5.5V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC16F1527-E/PT 功能描述:8位微控制器 -MCU 14KB Flash RAM 768b nanoWatt RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC16F1527-I/MR 功能描述:8位微控制器 -MCU 28KB FL 1536B RAM 10bit ADC 1.8-5.5V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC16F1527-I/MR 制造商:Microchip Technology Inc 功能描述:IC 8BIT MCU PIC16F 20 MHz 64-QFN 制造商:Microchip Technology Inc 功能描述:IC, 8BIT MCU, PIC16F, 20 MHz, 64-QFN; Controller Family/Series:PIC16F; Core Size:8bit; No. of I/O's:54; Program Memory Size:28KB; RAM Memory Size:1536Byte; CPU Speed:20MHz; Oscillator Type:External, Internal; No. of Timers:9 ;RoHS Compliant: No
PIC16F1527-I/PT 功能描述:8位微控制器 -MCU 14KB Flash RAM 768b nanoWatt RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT