参数资料
型号: ST72652AR4T1/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, MICROCONTROLLER, PQFP64
封装: 10 X 10 MM, ROHS COMPLIANT, TQFP-64
文件页数: 3/161页
文件大小: 2656K
代理商: ST72652AR4T1/XXX
ST72651AR6
100/161
Doc ID 7215 Rev 4
SERIAL PERIPHERAL INTERFACE (Cont’d)
11.6.5.4 Single Master System
A typical single master system may be configured,
using an MCU as the master and four MCUs as
slaves (see Figure 61).
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 to its SPIDR
register.
Other transmission security methods can use
ports for handshake lines or data bytes with com-
mand fields.
Figure 61. Single Master / Multiple Slave Configuration
MISO
MOSI
MISO
SS
SCK
VDDF
Ports
Slave
MCU
Slave
MCU
Slave
MCU
Slave
MCU
Master
MCU
相关PDF资料
PDF描述
ST72651AR6T1E/XXX 8-BIT, MROM, MICROCONTROLLER, PQFP64
ST72652C4T1/XXX 8-BIT, MROM, MICROCONTROLLER, PQFP48
ST7267R8T1L/XXX 16-BIT, MROM, 30 MHz, RISC MICROCONTROLLER, PQFP64
ST7267C8T1/XXX 16-BIT, MROM, 30 MHz, RISC MICROCONTROLLER, PQFP48
ST72774S9T1/XXX 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP44
相关代理商/技术参数
参数描述
ST7265X-EVAL/MS 制造商:STMicroelectronics 功能描述:ST6 EVAL BD - Bulk
ST7265X-EVAL/PFD 制造商:STMicroelectronics 功能描述:USB FLASH EVAL - Bulk
ST7266 制造商:6940 功能描述:ST7266
ST7267C8T1L 制造商:STMicroelectronics 功能描述:
ST72681/R12 制造商:STMicroelectronics 功能描述:CONTROLLER FOR HIGH-PERFORMANCE BUS-POWERED USB 2.0 FLASH DR - Trays