- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98144 > ST72121J2T3/XXX (STMICROELECTRONICS) 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP44 PDF資料下載
參數(shù)資料
| 型號： | ST72121J2T3/XXX |
| 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, PQFP44 |
| 封裝： | PLASTIC, TQFP-44 |
| 文件頁數(shù)： | 53/87頁 |
| 文件大?。?/td> | 1365K |
| 代理商： | ST72121J2T3/XXX |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁當(dāng)前第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁
57/87
ST72121
4.5 SERIAL PERIPHERAL INTERFACE (SPI)
4.5.1 Introduction
The Serial Peripheral Interface (SPI) allows full-
duplex, synchronous, serial communication with
external devices. An SPI system may consist of a
master and one or more slaves or a system in
which devices may be either masters or slaves.
The SPI is normally used for communication be-
tween the microcontroller and external peripherals
or another microcontroller.
Refer to the Pin Description chapter for the device-
specific pin-out.
4.5.2 Main Features
Full duplex, three-wire synchronous transfers
Master or slave operation
Four master mode frequencies
Maximum slave mode frequency = fCPU/2.
Four programmable master bit rates
Programmable clock polarity and phase
End of transfer interrupt flag
Write collision flag protection
Master mode fault protection capability.
4.5.3 General description
The SPI is connected to external devices through
4 alternate pins:
– MISO: Master In Slave Out pin
– MOSI: Master Out Slave In pin
– SCK: Serial Clock pin
– SS: Slave select pin
A basic example of interconnections between a
single master and a single slave is illustrated on
Figure 34.
The MOSI pins are connected together as are
MISO pins. In this way data is transferred serially
between master and slave (most significant bit
first).
When the master device transmits data to a slave
device via MOSI pin, the slave device responds by
sending data to the master device via the MISO
pin. This implies full duplex transmission with both
data out and data in synchronized with the same
clock signal (which is provided by the master de-
vice via the SCK pin).
Thus, the byte transmitted is replaced by the byte
received and eliminates the need for separate
transmit-empty and receiver-full bits. A status flag
is used to indicate that the I/O operation is com-
plete.
Four possible data/clock timing relationships may
be chosen (see Figure 37) but master and slave
must be programmed with the same timing mode.
Figure 34. Serial Peripheral Interface Master/Slave
8-BIT SHIFT REGISTER
SPI
CLOCK
GENERATOR
8-BIT SHIFT REGISTER
MISO
MOSI
MISO
SCK
SLAVE
MASTER
SS
+5V
MSBit
LSBit
MSBit
LSBit
VR02131A
57
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST72121J2T6/XXX | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP44 |
| ST72141K2B3/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32 |
| ST72311N4T6/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64 |
| ST72311J2B6/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 |
| ST72311N2T3/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST72121J4 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT MICROCONTROLLER (MCU) WITH 8 TO 16 K ROM/OTP/EPROM. 384 TO 512 BYTES RAM. WDG. SCI. SPI & 2 TIMERS - SDIP42. TQFP44 |
| ST72124J | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
| ST72124J2 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
| ST72124J2B | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
| ST72124J2B1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。