收藏本站
218
XMEGA A [MANUAL]
8077I–AVR–11/2012
19.9.5 BAUD
– Baud Rate register
The baud rate (BAUD) register defines the relation between the system clock and the TWI bus clock (SCL) frequency.
The frequency relation can be expressed by using the following equation:
[1]
The BAUD register must be set to a value that results in a TWI bus clock frequency (fTWI) equal or less than 100kHz or
400kHz, depending on which standard the application should comply with. The following equation [2] expresses equation
[1] solved for the BAUD value:
[2]
The BAUD register should be written only while the master is disabled.
19.9.6 ADDR
– Address register
When the address (ADDR) register is written with a slave address and the R/W bit while the bus is idle, a START
condition is issued and the 7-bit slave address and the R/W bit are transmitted on the bus. If the bus is already owned
when ADDR is written, a repeated START is issued. If the previous transaction was a master read and no acknowledge
is sent yet, the acknowledge action is sent before the repeated START condition.
After completing the operation and the acknowledge bit from the slave is received, the SCL line is forced low if arbitration
was not lost. WIF is set.
If the bus state is unknown when ADDR is written, WIF is set and BUSERR is set.
All TWI master flags are automatically cleared when ADDR is written. This includes BUSERR, ARBLOST, RIF, and WIF.
The master ADDR can be read at any time without interfering with ongoing bus activity.
19.9.7 DATA
– Data register
The data (DATA) register is used when transmitting and receiving data. During data transfer, data are shifted from/to the
DATA register and to/from the bus. This implies that the DATA register cannot be accessed during byte transfers, and
Bit
765
4321
0
+0x04
BAUD[7:0]
Read/Write
R/W
Initial Value
000
0000
0
f
TWI
f
sys
2(5
BAUD
)
+
---------------------------------------[Hz]
=
BAUD
f
sys
2f
TWI
--------------
5
–
=
Bit
76543210
+0x05
ADDR[7:0]
Read/Write
R/W
Initial Value
00000000
Bit
76543210
+0x06
DATA[7:0]
Read/Write
R/W
Initial Value
00000000
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
PIC18F4450T-I/ML IC PIC MCU FLASH 8KX16 44QFN
PIC18F4321T-I/ML IC PIC MCU FLASH 4KX16 44QFN
PIC18F4221T-I/ML IC PIC MCU FLASH 2KX16 44QFN
PIC18F2321T-I/ML IC PIC MCU FLASH 4KX16 28QFN
PIC18F2221T-I/SO IC PIC MCU FLASH 2KX16 28SOIC
PIC16LF1939-I/MV IC MCU 8BIT 28KB FLASH 40-UQFN
PIC24F16KL402-I/SP IC MCU 16BIT 16KB FLASH 28-SPDIP
PIC18F24J11-I/SS IC PIC MCU FLASH 16K 2V 28-SSOP
相关代理商/技术参数
PIC18F4455-BL 制造商:POWERLITE SYSTEMS 功能描述:PIC18F445 W/ BOOTLOADER FOR FLASHLAB 制造商:POWERLITE SYSTEMS 功能描述:PIC18F445 W/ BOOTLOADER, FOR FLASHLAB 制造商:POWERLITE SYSTEMS 功能描述:PIC18F445 W/ BOOTLOADER, FOR FLASHLAB; Silicon Manufacturer:Powerlite Systems; Core Architecture:PIC; Kit Contents:Board; Features:Bootloader Programming, RS232 Connector for Boot-Loading and Serial Comms ;RoHS Compliant: Yes
PIC18F4455-I/ML 功能描述:8位微控制器 -MCU 24kBF 2048RM FSUSB2 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
PIC18F4455-I/P 功能描述:8位微控制器 -MCU 24kBF 2048RM FSUSB2 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
PIC18F4455-I/PT 功能描述:8位微控制器 -MCU 24kBF 2048RM FSUSB2 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
PIC18F4455T-I/ML 功能描述:8位微控制器 -MCU 24kBF 2048RM FSUSB2 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
PIC18F4455T-I/PT 功能描述:8位微控制器 -MCU 24kBF 2048RM FSUSB2 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
PIC18F4458-I/ML 功能描述:8位微控制器 -MCU 24KB Flash 2KB RAM 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
PIC18F4458-I/P 功能描述:8位微控制器 -MCU 24KB Flash 2KB RAM 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