参数资料
型号: ST72F651AR6T1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 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: ST72F651AR6T1
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
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