S08_12_Freescale_HCS08单片机SPI编程应用.pdf

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1、Copyright Yang Ming.2011.Electronics and Information Engineering Department of Huazhong University of Science and TechnologyWuhan,Hubei 430074,P.R.ChinaFreescale 单片机原理及应用单片机原理及应用 Freescale HCS08单片机单片机SPI编程应用编程应用Copyright Yang Ming.2011.Electronics and Information Engineering Department of Huazhong U

2、niversity of Science and TechnologyWuhan,Hubei 430074,P.R.ChinaSlide 1Slide 1Freescale HCS08单片机单片机SPI编程应用编程应用 Contents and ObjectivesContents and Objectives:理解HCS08的SPI模块原理SPI总线信号SPI总线时序SPI模块结构及功能学会SPI模块设计SPI模块寄存器功能利用SPI模块的串-并转换设计进一步认识“对MCU外部管脚/内部模块的控制正是通过Regs的控制来实现”Copyright Yang Ming.2011.Electron

3、ics and Information Engineering Department of Huazhong University of Science and TechnologyWuhan,Hubei 430074,P.R.ChinaSlide 210.1 概述概述概况 MC9S08AW60系列MCU内部具有一个SPI模块，SPI的4个功能管脚SPSCK1、MOSI1、MISO1、SS1 分别和端口E的PTE7、PTE6、PTE5、PTE4管脚复用管脚描述SPSCK SPI串行时钟MOSI 主设备数据输出、从设备数据输入MISO 主设备数据输入、从设备数据输出SS1从设备选择Copyrig

4、ht Yang Ming.2011.Electronics and Information Engineering Department of Huazhong University of Science and TechnologyWuhan,Hubei 430074,P.R.China10.2 SPI总线信号和时序总线信号和时序SPI总线信号 SPI，英文全称为Serial Peripheral Interface，串行外围设备接口的意思，是Motorola公司开发的一种全双工同步串行总线。目前有很多外围芯片，例如存储器、A/D或D/A变换器，LCD等均采用SPI接口。SPI使用4个信号来

5、收发数据。Slide 3Copyright Yang Ming.2011.Electronics and Information Engineering Department of Huazhong University of Science and TechnologyWuhan,Hubei 430074,P.R.China10.2 SPI总线信号和时序总线信号和时序SPI总线时序Slide 4Copyright Yang Ming.2011.Electronics and Information Engineering Department of Huazhong University o

6、f Science and TechnologyWuhan,Hubei 430074,P.R.China10.2 SPI总线信号和时序总线信号和时序SPI总线时序Slide 5Copyright Yang Ming.2011.Electronics and Information Engineering Department of Huazhong University of Science and TechnologyWuhan,Hubei 430074,P.R.China10.3 功能描述功能描述内部结构Slide 6Copyright Yang Ming.2011.Electronics

7、 and Information Engineering Department of Huazhong University of Science and TechnologyWuhan,Hubei 430074,P.R.ChinaSPI波特率生成10.3 功能描述功能描述Slide 7Copyright Yang Ming.2011.Electronics and Information Engineering Department of Huazhong University of Science and TechnologyWuhan,Hubei 430074,P.R.ChinaSPI波

8、特率寄存器（SPI1BR）Slide 810.4 内部寄存器内部寄存器Copyright Yang Ming.2011.Electronics and Information Engineering Department of Huazhong University of Science and TechnologyWuhan,Hubei 430074,P.R.ChinaSPI控制寄存器1（SPI1C1）Slide 910.4 内部寄存器内部寄存器Copyright Yang Ming.2011.Electronics and Information Engineering Departmen

9、t of Huazhong University of Science and TechnologyWuhan,Hubei 430074,P.R.ChinaSPI控制寄存器1（SPI1C1）Slide 1010.4 内部寄存器内部寄存器Copyright Yang Ming.2011.Electronics and Information Engineering Department of Huazhong University of Science and TechnologyWuhan,Hubei 430074,P.R.ChinaSPI控制寄存器2（SPI1C2）Slide 1110.4

10、内部寄存器内部寄存器Copyright Yang Ming.2011.Electronics and Information Engineering Department of Huazhong University of Science and TechnologyWuhan,Hubei 430074,P.R.ChinaSPI状态寄存器（SPI1S）Slide 1210.4 内部寄存器内部寄存器Copyright Yang Ming.2011.Electronics and Information Engineering Department of Huazhong University o

11、f Science and TechnologyWuhan,Hubei 430074,P.R.ChinaSPI数据寄存器（SPI1D）读此寄存器会返回接收数据缓冲器中的数据，写此寄存器会把数据写入到发送数据缓冲器。当SPI被配置为主设备时，写数据到发送数据缓冲器将启动一次SPI传送。只有SPI发送缓冲器空标志位SPTEF位为1，表示发送缓冲器为空准备接收新数据时，才能向发送数据缓冲器写入要发送数据。Slide 1310.4 内部寄存器内部寄存器Copyright Yang Ming.2011.Electronics and Information Engineering Department

12、of Huazhong University of Science and TechnologyWuhan,Hubei 430074,P.R.China10.5 SPI应用举例应用举例SPI使用设置1通过SPIBR寄存器中的SPPR2:0和SPR2:0来设定SPI的时钟频率；2通过SPIC1寄存器中的CPOL位和CPHA位设定SPI时钟的极性和相位，注意SPI模块和与之通信的其它器件之间的时钟极性和相位应该保持一致；3通过SPIC1中的MSTR位选择SPI模块的主/从模式；4根据实际需要，通过SPIC1中的SPIE、SPTIE和SPIC2中的MODFEN设置相应中断允许；5通过SPIC1中的L

13、SBFE、SPIC2中的BIDIROE和SPC0等，进行一些可选设置；6如果是主设备模式，通过置SPIC1中的SPE位来允许SPI模块；7如果是从设备模式，通过置SPIC1中的SPE位来允许SPI模块。注意注意：不能在改变：不能在改变SPIC1中中CPHA位的同时也禁止位的同时也禁止SPI（SPE=0），此时对），此时对这两个位的设定要分开进行，否则会产生不可预料的结果。这两个位的设定要分开进行，否则会产生不可预料的结果。Slide 14Copyright Yang Ming.2011.Electronics and Information Engineering Department of

14、Huazhong University of Science and TechnologyWuhan,Hubei 430074,P.R.ChinaMC9S08AW60的SPI外接74HC595芯片，编写程序，在共阴极七段数码管上每隔500ms循环显示字符09。设总线时钟为4MHz。Slide 1510.5 SPI应用举例应用举例abcdefghLSEG0e4d51#1c8h7b9a106#6f2g3GNDRST#GNDBKGDRST#BKGD3.3VIRQ0.1uFPowerCLKPORTDPORTGPORTFPORTCPORTBPORTAPORTEMC9S08AW60MC9S08AW60CP

15、UEPTC41IRQ2RESET#3PTF0/TPM1CH24TPF1/TPM1CH35TPF2/TPM1CH46TPF3/TPM1CH57TPF4/TPM2CH08PTC69PTF710TPF5/TPM2CH111PTF612PTE0/TxD113PTE1/RxD114PTE2/TPM1CH015PTE3/TPM1CH116PTE4/SS1#17PTE5/MISO118PTE6/MOSI119PTE7/SPSCK120VSS2121VDD2222PTG0/KBI1P023PTG1/KBI1P124PTG2/KBI1P225PTA026PTA127PTA228PTA329PTA430PTA53

16、1PTA632PTA733PTB0/AD1P034PTB1/AD1P135PTB2/AD1P236PTB3/AD1P337PTB4/AD1P438PTB5/AD1P539PTB6/AD1P640PTB7/AD1P741PTD0/AD1P842PTD1/AD1P943VDDAD4444VSSAD4545PTD2/KBI1P5/AD1P1046PTD3/KBI1P6/AD1P1147PTG3/KBI1P348PTG4/KBI1P449PTD4/TPM2CLK/AD1P1250PTD5/AD1P1351PTD6/TPM1CLK/AD1P1452PTD7/KBI1P7/AD1P1553VREFH54V

17、REFL55BKGD/MS56PTG5/XTAL57PTG6/EXTAL58VSS5959PTC0/SCL160PTC1/SDA161PTC2/MCLK62PTC3/TxD263PTC5/RxD2644.0MHzBDM socket12345622pF10K0.1uF0.1uF+10uF/Tan1210KSW11243JUMP-210M22pF1KSW212430.1uF0.1uFGNDGNDGNDGND3.3VGND3.3V3.3VGNDGND74HC595/SOICGND8SDO9CLR#10OE#13SDI14VCC16SCLK11RCLK12QA15QB1QC2QD3QE4QF5QG6

18、QH7GND0.1uF+10uF1210KSPI_SPCKSPI_MOSI3.3V3.3VCopyright Yang Ming.2011.Electronics and Information Engineering Department of Huazhong University of Science and TechnologyWuhan,Hubei 430074,P.R.ChinaMC9S08AW60的SPI外接74HC595芯片，编写程序，在共阴极七段数码管上每隔500ms循环显示字符09。设总线时钟为4MHz。参考代码：Slide 1610.5 SPI应用举例应用举例INCLUD

19、EMC9S08AW60.inc;包含头文件Pin_RCLKEQU1Pin_CLREQU0 ORG$0070Tx_DataDS1;SPI发送数据 ORG$1860LED_Table:;公阴极LED码表一定要定位到Flash区DC.B$3F,$06,$5B,$4F,$66;04的字形码DC.B$6D,$7D,$07,$7F,$6F;59的字形码 SPI_Init:;SPI模块初始化子程序MOV#$32,SPI1BR;fBUS=4MHz时，SPI时钟频率=125KHzMOV#$5D,SPI1C1;允许SPI,主模式,CPOL=CPHA=1,MSB先发MOV#$00,SPI1C2;按照缺省设定RTSC

20、opyright Yang Ming.2011.Electronics and Information Engineering Department of Huazhong University of Science and TechnologyWuhan,Hubei 430074,P.R.ChinaMC9S08AW60的SPI外接74HC595芯片，编写程序，在共阴极七段数码管上每隔500ms循环显示字符09。设总线时钟为4MHz。参考代码：Slide 1710.5 SPI应用举例应用举例Delay_500ms:;软件延时500ms子程序;代码略，可参考3.6.3节内容RTS Main:CL

21、RHCLRASTASOPT;禁止看门狗MOV#$00,Tx_Data;发送标志初始化BCLRPin_RCLK,PTED;使595的RCLK为低MOV#$03,PTEDD;PTE1:0作输出BCLRPin_CLR,PTED;清零595内部寄存器BRN$;Pin_CLR低电平持续3个总线周期BSETPin_CLR,PTED;保持595的CLR为高JSRSPI_Init;SPI模块初始化Again:CLRXCopyright Yang Ming.2011.Electronics and Information Engineering Department of Huazhong University

22、 of Science and TechnologyWuhan,Hubei 430074,P.R.ChinaMC9S08AW60的SPI外接74HC595芯片，编写程序，在共阴极七段数码管上每隔500ms循环显示字符09。设总线时钟为4MHz。参考代码：Slide 1810.5 SPI应用举例应用举例Again:CLRXNext:BRCLR7,SPI1S,*;SPI发送缓存是否为空，不为空则等待LDALED_Table,XSTASPI1D;发送一个字型码到595内部寄存器BRCLR7,SPI1S,*;等待SPI发送结束BSETPin_RCLK,PTED;产生RCLK上升沿，字型码送到;595内

23、部锁存器BRN$;Pin_RCLK高电平持续3个总线周期BCLRPin_RCLK,PTEDJSRDelay_500ms;显示持续500msINCXCPX#$0ABNENext;一遍未显示完，继续显现BRAAgain;一遍显示完，从新显示 ORG$FFFE;上电复位地址DC.WMainCopyright Yang Ming.2011.Electronics and Information Engineering Department of Huazhong University of Science and TechnologyWuhan,Hubei 430074,P.R.ChinaSlide 19Freescale HCS08单片机单片机SPI编程应用编程应用