参数资料
型号: ST72324K6B3/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32
封装: 0.400 INCH, SHRINK, PLASTIC, DIP-32
文件页数: 134/157页
文件大小: 1037K
代理商: ST72324K6B3/XXX
ST72324J/K
78/157
SERIAL PERIPHERAL INTERFACE (Cont’d)
10.4.3.1 Functional Description
A basic example of interconnections between a
single master and a single slave is illustrated in
Figure 48.
The MOSI pins are connected together and the
MISO pins are connected together. In this way
data is transferred serially between master and
slave (most significant bit first).
The communication is always initiated by the mas-
ter. When the master device transmits data to a
slave device via MOSI pin, the slave device re-
sponds by sending data to the master device via
the MISO pin. This implies full duplex communica-
tion with both data out and data in synchronized
with the same clock signal (which is provided by
the master device via the SCK pin).
To use a single data line, the MISO and MOSI pins
must be connected at each node ( in this case only
simplex communication is possible).
Four possible data/clock timing relationships may
be chosen (see Figure 51) but master and slave
must be programmed with the same timing mode.
Figure 48. Single Master/ Single Slave Application
8-BIT SHIFT REGISTER
SPI
CLOCK
GENERATOR
8-BIT SHIFT REGISTER
MISO
MOSI
MISO
SCK
SLAVE
MASTER
SS
+5V
MSBit
LSBit
MSBit
LSBit
Not used if SS is managed
by software
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