- 您现在的位置：买卖IC网 > Sheet目录342 > MCBSTM32EXL (Keil)BOARD EVALUATION FOR STM32F103ZE
Serial peripheral interface (SPI)
Figure 208. Single master/ single slave application
Master
Slave
RM0008
MSBit
LSBit
MSBit
LSBit
8-bit shift register
SPI clock
MISO
MOSI
SCK
MISO
MOSI
SCK
8-bit shift register
generator
NSS (1)
V DD
NSS (1)
Not used if NSS is managed
by software
ai14745
1. Here, the NSS pin is configured as an input.
The MOSI pins are connected together and the MISO pins are connected together. In this
way data is transferred serially between master and slave (most significant bit first).
The communication is always initiated by the master. When the master device transmits
data to a slave device via the MOSI pin, the slave device responds via the MISO pin. This
implies full-duplex communication with both data out and data in synchronized with the
same clock signal (which is provided by the master device via the SCK pin).
Slave select (NSS) pin management
There are two NSS modes:
●
●
Software NSS mode: this mode is enabled by setting the SSM bit in the SPI_CR1
register (see Figure 209 ). In this mode, the external NSS pin is free for other
application uses and the internal NSS signal level is driven by writing to the SSI bit in
the SPI_CR1 register.
Hardware NSS mode: there are two cases:
–
–
NSS output is enabled: when the STM32F20xxx is operating as a Master and the
NSS output is enabled through the SSOE bit in the SPI_CR2 register, the NSS pin
is driven low and all the NSS pins of devices connected to the Master NSS pin see
a low level and become slaves when they are configured in NSS hardware mode.
When an SPI wants to broadcast a message, it has to pull NSS low to inform all
others that there is now a master for the bus. If it fails to pull NSS low, this means
that there is another master communicating, and a Hard Fault error occurs.
NSS output is disabled: the multimaster capability is allowed.
Figure 209. Hardware/software slave select management
SSM bit
SSI bit
NSS external pin
1
0
NSS Internal
ai14746
590/995
Doc ID 13902 Rev 9
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
MCBTMPM330
BOARD EVAL TOSHIBA TMPM330 SER
MCIMX25WPDKJ
KIT DEVELOPMENT WINCE IMX25
MCIMX53-START-R
KIT DEVELOPMENT I.MX53
MCM69C432TQ20
IC CAM 1MB 50MHZ 100LQFP
MCP1401T-E/OT
IC MOSFET DRVR INV 500MA SOT23-5
MCP1403T-E/MF
IC MOSFET DRIVER 4.5A DUAL 8DFN
MCP1406-E/SN
IC MOSFET DVR 6A 8SOIC
MCP14628T-E/MF
IC MOSFET DVR 2A SYNC BUCK 8-DFN
相关代理商/技术参数
MCBSTM32EXLU
功能描述:开发板和工具包 - ARM EVAL BOARD + ULINK2 FOR STM32F103ZG
RoHS:否 制造商:Arduino 产品:Development Boards 工具用于评估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口类型:DAC, ICSP, JTAG, UART, USB 工作电源电压:3.3 V
MCBSTM32EXLU-ED
制造商:ARM Ltd 功能描述:KEIL STM STM32EXL EVAL BOARD
MCBSTM32EXLUME
功能描述:开发板和工具包 - ARM EVAL BOARD + ULINKME FOR STM32F103ZG
RoHS:否 制造商:Arduino 产品:Development Boards 工具用于评估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口类型:DAC, ICSP, JTAG, UART, USB 工作电源电压:3.3 V
MCBSTM32F200
功能描述:开发板和工具包 - ARM EVAL BOARD FOR STM STM32F207IG
RoHS:否 制造商:Arduino 产品:Development Boards 工具用于评估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口类型:DAC, ICSP, JTAG, UART, USB 工作电源电压:3.3 V
MCBSTM32F200U
功能描述:开发板和工具包 - ARM EVAL BOARD FOR STM STM32F207IG + ULINK2
RoHS:否 制造商:Arduino 产品:Development Boards 工具用于评估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口类型:DAC, ICSP, JTAG, UART, USB 工作电源电压:3.3 V
MCBSTM32F200UME
功能描述:开发板和工具包 - ARM EVAL BOARD FOR STM STM32F207IG ULINK-ME
RoHS:否 制造商:Arduino 产品:Development Boards 工具用于评估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口类型:DAC, ICSP, JTAG, UART, USB 工作电源电压:3.3 V
MCBSTM32F200UME-ED
制造商:ARM Ltd 功能描述:KEIL STM32F207IG EVAL BOARD
MCBSTM32F400
功能描述:开发板和工具包 - ARM EVAL BOARD FOR STM STM32F407IG
RoHS:否 制造商:Arduino 产品:Development Boards 工具用于评估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口类型:DAC, ICSP, JTAG, UART, USB 工作电源电压:3.3 V