參數(shù)資料
型號(hào)： ST72121J4
元件分類： 8位微控制器
英文描述： 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
中文描述： 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存
文件頁(yè)數(shù)： 71/93頁(yè)
文件大小： 915K
代理商： ST72121J4
71/93
ST72E121 ST72T121
SERIAL PERIPHERAL INTERFACE
(Cont’d)
5.5.4.7 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 40
).
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 40. Single Master Configuration
MISO
MOSI
MOSI
MOSI
MOSI
MOSI
MISO
MISO
MISO
MISO
SS
SS
SS
SS
SS
SCK
SCK
SCK
SCK
SCK
5V
P
Slave
MCU
Slave
MCU
Slave
MCU
Slave
MCU
Master
MCU
71
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