收藏本站
...the world's most energy friendly microcontrollers
Figure 16.10. USART Transmission of Large Frames, MSBF
Peripheral Bus
TX buffer elem ent 1
0
1
2
TX buffer elem ent 0
0
1
2
3
4
5
6
7
Shift register
2
1
0
7
6
5
4
3
2
1
0
Figure 16.10 (p. 190) illustrates the order of the transmitted bits when an 11 bit frame is transmitted
with MSBF set. If MSBF is set and the frame is smaller than 10 bits, only the contents of transmit buffer
0 will be transmitted.
When receiving a large frame, BYTESWAP in USARTn_CTRL determines the order the way the large
frame is split into the two buffer elements. If BYTESWAP is cleared, the least significant 8 bits of the
received frame are loaded into the first element of the receive buffer, and the remaining bits are loaded
into the second element, as shown in Figure 16.11 (p. 190) . The first byte read from the buffer thus
contains the 8 least significant bits. Set BYTESWAP to reverse the order.
The status bits are loaded into both elements of the receive buffer. The frame is not moved from the
receive shift register before there are two free spaces in the receive buffer.
Figure 16.11. USART Reception of Large Frames
Peripheral Bus
RX buffer elem ent 0
Status
0
1
2
3
4
5
6
7
RX buffer elem ent 1
Status
0
1
2
Shift register
Status
0
1
2
3
4
5
6
7
0
1
2
The two buffer elements can be read at the same time using the USARTn_RXDOUBLE or
USARTn_RXDOUBLEX register. RXDATA0 then refers to buffer element 0 and RXDATA1 refers to
buffer element 1.
Large frames can be used in both asynchronous and synchronous modes.
16.3.2.8 Multi-Processor Mode
To simplify communication between multiple processors, the USART supports a special multi-processor
mode. In this mode the 9th data bit in each frame is used to indicate whether the content of the remaining
8 bits is data or an address.
When multi-processor mode is enabled, an incoming 9-bit frame with the 9th bit equal to the value of
MPAB in USARTn_CTRL is identified as an address frame. When an address frame is detected, the
2011-04-12 - d0001_Rev1.10
190
www.energymicro.com
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
EFM32GG-STK3700 KIT STARTER GIANT GECKO
EFM32LG-DK3650 KIT DEV EFM32 LEOPARD GECKO
EK-K7-KC705-CES-G-J KINTEX-7 FPGA KC705 EVAL KIT
EK-S6-SP601-G KIT EVAL SPARTAN 6 SP601
EK-S6-SP605-G KIT EVAL SPARTAN 6 SP605
EK-V6-ML631-G-J VIRTEX-6 HXT FPGA ML631 EVAL KIT
EK-V7-VC707-CES-G VIRTEX-7 VC707 EVAL KIT
EK-Z7-ZC702-CES-G ZYNQ-7000 EPP ZC702 EVAL KIT
相关代理商/技术参数
EFM32GG230F1024 功能描述:ARM微控制器 - MCU 1024KB FL 128KB RAM RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 处理器系列:STM32F373xx 数据总线宽度:32 bit 最大时钟频率:72 MHz 程序存储器大小:256 KB 数据 RAM 大小:32 KB 片上 ADC:Yes 工作电源电压:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:LQFP-48 安装风格:SMD/SMT
EFM32GG230F1024G-E-QFN64R 功能描述:IC MCU 32BIT 1MB FLASH 64QFN 制造商:silicon labs 系列:Giant Gecko 包装:剪切带（CT） 零件状态:在售 核心处理器:ARM? Cortex?-M3 核心尺寸:32-位 速度:48MHz 连接性:I2C，IrDA，智能卡，SPI，UART/USART 外设:欠压检测/复位，DMA，POR，PWM，WDT I/O 数:56 程序存储容量:1MB（1M x 8） 程序存储器类型:闪存 EEPROM 容量:- RAM 容量:128K x 8 电压 - 电源（Vcc/Vdd）:1.98 V ~ 3.8 V 数据转换器:A/D 8x12b，D/A 2x12b 振荡器类型:内部 工作温度:-40°C ~ 85°C（TA） 封装/外壳:64-VFQFN 裸露焊盘 供应商器件封装:64-QFN（9x9） 标准包装:1
EFM32GG230F1024-QFN64 制造商:Energy Micro AS 功能描述:GIANT GECKO MCU - Cut TR (SOS) 制造商:Energy Micro 功能描述:GIANT GECKO MCU 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 1MB FLASH 64QFN
EFM32GG230F1024-QFN64T 制造商:Energy Micro AS 功能描述:GIANT GECKO MCU - Trays
EFM32GG230F1024-QFN64-T 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 1MB FLASH 64QFN
EFM32-GG230F1024-SK 制造商:Energy Micro AS 功能描述:GIANT GECKO SAMPLE KIT - Bulk
EFM32GG230F1024-T 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 1MB FLASH 64QFN
EFM32GG230F512 功能描述:ARM微控制器 - MCU 512KB FL 128KB RAM RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 处理器系列:STM32F373xx 数据总线宽度:32 bit 最大时钟频率:72 MHz 程序存储器大小:256 KB 数据 RAM 大小:32 KB 片上 ADC:Yes 工作电源电压:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:LQFP-48 安装风格:SMD/SMT