参数资料
型号: ST72E331J4D0
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, UVPROM, 8 MHz, MICROCONTROLLER, CDIP42
封装: 0.600 INCH, WINDOWED, CERAMIC, SDIP-42
文件页数: 84/107页
文件大小: 691K
代理商: ST72E331J4D0
78/107
ST72E331 ST72T331
SERIAL PERIPHERAL INTERFACE (Cont’d)
5.6.4.7 Single Master and Multimaster Configurations
There are two types of SPI systems:
– Single Master System
– Multimaster System
Single Master System
A typical single master system may be configured,
using an MCU as the master and four MCUs as
slaves (see Figure 6).
The master device selects the individual slave de-
vices by using four pins of a parallel port to control
the four SS pins of the slave devices.
The SS pins are pulled high during reset since the
master device ports will be forced to be inputs at
that time, thus disabling the slave devices.
Note: To prevent a bus conflict on the MISO line
the master allows only one active slave device
during a transmission.
For more security, the slave device may respond
to the master with the received data byte. Then the
master will receive the previous byte back from the
slave device if all MISO and MOSI pins are con-
nected and the slave has not written its DR regis-
ter.
Other transmission security methods can use
ports for handshake lines or data bytes with com-
mand fields.
Multi-master System
A multi-master system may also be configured by
the user. Transfer of master control could be im-
plemented using a handshake method through the
I/O ports or by an exchange of code messages
through the serial peripheral interface system.
The multi-master system is principally handled by
the MSTR bit in the CR register and the MODF bit
in the SR register.
Figure 45. Single Master Configuration
MISO
MOSI
MISO
SS
SCK
5V
Ports
Slave
MCU
Slave
MCU
Slave
MCU
Slave
MCU
Master
MCU
78
相关PDF资料
PDF描述
ST72T331N2T1S 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP64
ST72T331J4B6 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDIP42
ST72T331J2T6 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP44
ST72E331N4D0 8-BIT, UVPROM, 8 MHz, MICROCONTROLLER, CDIP56
ST72T331N2B6S 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDIP56
相关代理商/技术参数
参数描述
ST72E331J4D0S 功能描述:8位微控制器 -MCU UV EPROM 16K 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
ST72E331N4D0 功能描述:8位微控制器 -MCU UV EPROM 16K 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
ST72E331N4D0S 功能描述:8位微控制器 -MCU UV EPROM 16K 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
ST72E4K64-A75EC 制造商:STEC Inc 功能描述:512MB DDR-266 ECC/REG - Bulk
ST72E4K64ML-C06E 制造商:STEC Inc 功能描述:512MB 512MB DDR PC2700 REG/ECC