參數(shù)資料
型號(hào)： ST72171
英文描述： 8-BIT MCU WITH 8K FLASH. ADC. WDG. SPI. SCI. TIMERS SPGAS (SOFTWARE PROGRAMMABLE GAIN AMPLIFIERS). OP-AMP
中文描述： 8位8K閃存微控制器。 ADC的。水分散粒劑。的SPI。脊髓損傷。定時(shí)器SPGAS（軟件可編程增益放大器）。運(yùn)放
文件頁(yè)數(shù)： 71/93頁(yè)
文件大?。?/td> 915K
代理商： ST72171
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
相關(guān)PDF資料
PDF描述
ST733C04LFL0 Fuse Holder; Fuse Size/Group:Micro; Mounting Type:PC Board; Body Material:Thermoplastic; Contact Material:Copper Alloy; Contact Plating:Tin; Current Rating:5A; Leaded Process Compatible:Yes; Terminal Type:Push-On
ST733C04LFM0 Fuse Holder; Leaded Process Compatible:Yes; Mounting Type:Panel Mount RoHS Compliant: Yes
ST733C08LFL0 Fuse Holder; Leaded Process Compatible:Yes; Mounting Type:Panel Mount RoHS Compliant: Yes
ST733C08LFM0 Automotive Fuse; Current Rating:3A; Voltage Rating:32V; Fuse Type:Fast Acting; Body Material:Plastic; Fuse Terminals:Blade; Length:15.41mm; Series:297; Voltage Rating:32V; Fuse Size/Group:15.41 x 10.92 x 3.81mm RoHS Compliant: Yes
ST7597 FUSE, 0.250A, 250V, 3AG SLO-BLO, CARTRIDGE
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ST72171K2 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:REAL-TIME DEVELOPMENT TOOLS FOR THE ST7 MCU FAMILY
ST72212 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH 4 TO 8K ROM/OTP/EPROM, 256 BYTES RAM, ADC, WDG, SPI AND 1 OR 2 TIMERS
ST72212G2 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH 4 TO 8K ROM/OTP/EPROM, 256 BYTES RAM, ADC, WDG, SPI AND 1 OR 2 TIMERS
ST72212G2B1 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH 4 TO 8K ROM/OTP/EPROM, 256 BYTES RAM, ADC, WDG, SPI AND 1 OR 2 TIMERS
ST72212G2B1/XXX 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MICROCONTROLLER|8-BIT|ST72 CPU|CMOS|SDIP|32PIN|PLASTIC
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