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參數(shù)資料
| 型號： | MC68HC711E20VFU2 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | QFP-64 |
| 文件頁數(shù)： | 27/242頁 |
| 文件大?。?/td> | 1672K |
| 代理商： | MC68HC711E20VFU2 |
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Serial Peripheral Interface (SPI)
M68HC11E Family Data Sheet, Rev. 5.1
122
Freescale Semiconductor
8.5.3 Serial Clock
SCK, an input to a slave device, is generated by the master device and synchronizes data movement in
and out of the device through the MOSI and MISO lines. Master and slave devices are capable of
exchanging a byte of information during a sequence of eight clock cycles.
Four possible timing relationships can be chosen by using control bits CPOL and CPHA in the serial
peripheral control register (SPCR). Both master and slave devices must operate with the same timing.
The SPI clock rate select bits, SPR[1:0], in the SPCR of the master device, select the clock rate. In a slave
device, SPR[1:0] have no effect on the operation of the SPI.
8.5.4 Slave Select
The slave select (SS) input of a slave device must be externally asserted before a master device can
exchange data with the slave device. SS must be low before data transactions and must stay low for the
duration of the transaction.
The SS line of the master must be held high. If it goes low, a mode fault error flag (MODF) is set in the
serial peripheral status register (SPSR). To disable the mode fault circuit, write a 1 in bit 5 of the port D
data direction register. This sets the SS pin to act as a general-purpose output rather than the dedicated
input to the slave select circuit, thus inhibiting the mode fault flag. The other three lines are dedicated to
the SPI whenever the serial peripheral interface is on.
The state of the master and slave CPHA bits affects the operation of SS. CPHA settings should be
identical for master and slave. When CPHA = 0, the shift clock is the OR of SS with SCK. In this clock
phase mode, SS must go high between successive characters in an SPI message. When CPHA = 1, SS
can be left low between successive SPI characters. In cases where there is only one SPI slave MCU, its
SS line can be tied to VSS as long as only CPHA = 1 clock mode is used.
8.6 SPI System Errors
Two system errors can be detected by the SPI system. The first type of error arises in a multiple-master
system when more than one SPI device simultaneously tries to be a master. This error is called a mode
fault. The second type of error, write collision, indicates that an attempt was made to write data to the
SPDR while a transfer was in progress.
When the SPI system is configured as a master and the SS input line goes to active low, a mode fault
error has occurred — usually because two devices have attempted to act as master at the same time. In
cases where more than one device is concurrently configured as a master, there is a chance of contention
between two pin drivers. For push-pull CMOS drivers, this contention can cause permanent damage. The
mode fault mechanism attempts to protect the device by disabling the drivers. The MSTR control bit in the
SPCR and all four DDRD control bits associated with the SPI are cleared and an interrupt is generated
subject to masking by the SPIE control bit and the I bit in the CCR.
Other precautions may need to be taken to prevent driver damage. If two devices are made masters at
the same time, mode fault does not help protect either one unless one of them selects the other as slave.
The amount of damage possible depends on the length of time both devices attempt to act as master.
A write collision error occurs if the SPDR is written while a transfer is in progress. Because the SPDR is
not double buffered in the transmit direction, writes to SPDR cause data to be written directly into the SPI
shift register. Because this write corrupts any transfer in progress, a write collision error is generated. The
transfer continues undisturbed, and the write data that caused the error is not written to the shifter.
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相關(guān)代理商/技術(shù)參數(shù) |
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| MC68HC711E9 K81H WAF | 制造商:Motorola Inc 功能描述: |
| MC68HC711E9CFN | 制造商:Rochester Electronics LLC 功能描述: |
| MC68HC711E9CFN2 | 功能描述:IC MCU 12K 2MHZ OTP 52-PLCC RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC11 其它有關(guān)文件:STM32F101T8 View All Specifications 特色產(chǎn)品:STM32 32-bit Cortex MCUs 標(biāo)準(zhǔn)包裝:490 系列:STM32 F1 核心處理器:ARM? Cortex?-M3 芯體尺寸:32-位 速度:36MHz 連通性:I²C，IrDA，LIN，SPI，UART/USART 外圍設(shè)備:DMA，PDR，POR，PVD，PWM，溫度傳感器，WDT 輸入/輸出數(shù):26 程序存儲器容量:64KB（64K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):2 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 10x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:36-VFQFN，36-VFQFPN 包裝:托盤 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名稱:497-9032STM32F101T8U6-ND |
| MC68HC711E9CFN3 | 功能描述:IC MCU 3MHZ 12K OTP 52-PLCC RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC11 其它有關(guān)文件:STM32F101T8 View All Specifications 特色產(chǎn)品:STM32 32-bit Cortex MCUs 標(biāo)準(zhǔn)包裝:490 系列:STM32 F1 核心處理器:ARM? Cortex?-M3 芯體尺寸:32-位 速度:36MHz 連通性:I²C，IrDA，LIN，SPI，UART/USART 外圍設(shè)備:DMA，PDR，POR，PVD，PWM，溫度傳感器，WDT 輸入/輸出數(shù):26 程序存儲器容量:64KB（64K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):2 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 10x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:36-VFQFN，36-VFQFPN 包裝:托盤 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名稱:497-9032STM32F101T8U6-ND |
| MC68HC711E9CFNE2 | 功能描述:8位微控制器 -MCU 8B OTP 512RAM A/D EE RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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