參數(shù)資料
型號: ST7PL05Y0MB
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO16
封裝: 0.150 INCH, PLASTIC, SOP-16
文件頁數(shù): 63/108頁
文件大?。?/td> 2098K
代理商: ST7PL05Y0MB
ST7L0
58/108
SERIAL PERIPHERAL INTERFACE (Cont’d)
11.3.5.4 Single Master Systems
A typical single master system may be configured,
using an MCU as the master and four MCUs as
slaves (see Figure 37).
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 are forced as 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 37. Single Master / Multiple Slave Configuration
MISO
MOSI
MISO
SS
SCK
5V
Ports
Slave
MCU
Slave
MCU
Slave
MCU
Slave
MCU
Master
MCU
1
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