參數(shù)資料
型號(hào): MC68HC711A0FB
廠(chǎng)商: 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述: ROM-based high-performance microcontrollers
中文描述: 基于ROM的高性能微控制器
文件頁(yè)數(shù): 82/124頁(yè)
文件大?。?/td> 840K
代理商: MC68HC711A0FB
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SERIAL PERIPHERAL INTERFACE
8-4
TECHNICAL DATA
8.3.1 Master In Slave Out
MISO is one of two unidirectional serial data signals. It is an input to a master device
and an output from a slave device. The MISO line of a slave device is placed in the
high impedance state if the slave device is not selected.
8.3.2 Master Out Slave In
The MOSI line is the second of the two unidirectional serial data signals. It is an output
from a master device and an input to a slave device. The master device places data
on the MOSI line a half-cycle before the clock edge that the slave device uses to latch
the data.
8.3.3 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.
There are four possible timing relationships that 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.
8.3.4 Slave Select
The SS input of a slave device must be externally asserted before a master device can
exchange data with the slave device. 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 one in bit 5 of the port D data direction register. This sets the SS pin to
act as a general-purpose output. The other three lines are dedicated to the SPI when-
ever the serial peripheral interface is on.
The state of the master and slave CPHA bits affects the operation of SS. CPHA set-
tings 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 succes-
sive SPI characters. In cases where there is only one SPI slave MCU, its SS line can
be tied to V
SS
as long as only CPHA = 1 clock mode is used.
8.4 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,
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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MC68HC711D3CFBE2 制造商:Freescale Semiconductor 功能描述:
MC68HC711D3CFN2 功能描述:IC MCU 2MHZ 4K OTP 44-PLCC RoHS:否 類(lèi)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(chǔ)器容量:64KB(64K x 8) 程序存儲(chǔ)器類(lèi)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(pán) 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(chēng):497-9032STM32F101T8U6-ND
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