单片机课件--第二章单片机结构.pdf

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1、2.1MCS-512.2MCS-512.1140P1.0VCC239P1.1P0.0338P1.2P0.1437P1.3P0.2536P1.4P0.3635P1.5P0.4734P1.6P0.58133P1.75P0.69732RST/VPD8P0.710RXDP3.01EA/VPP3111530TXDP3.10ALE/PROG12INT0P3.28PSEN2913128INT1P3.33P2.714T0P3.408P2.6271526T1P3.5P2.51625WRP3.6P2.41724RDP3.7P2.31823XTAL2P2.21922XTAL1P2.

2、12021VSSP2.0�2Vcc40Vss20�2XTAL119XTAL218�4RST/VppALE/PROGPSENEA/Vpp�I/O32P08P18P28P38VssVccVcc40+5VVss20GND220V5VXTAL119XTAL2188051�XTAL1�XTAL21+5VMCS-51XTAL1C1XTAL2CYSMCS-51TTLC2XTAL2XTAL1VSS12S1S2S3S4S5S6S1S2S3S4S5S6P1P2P1P2P1P2P1P2P1P2P1P2P1P2P1P2P1P2P1P2P1P2P1P2XTAL2(OSC)MCS-511

3、2MHz1/12MHz1/12μs0.0833μs1/6μs0.167μs1μs14μs1RST/VPD91RST2VPD22μFC122μFC1+5V+5VRSTRST8031803180518051R18751R287511KΩ200ΩR11KΩbaa8051bPC0000Hcd单片机A00HTMOD00H复位B00HTCON00H后PSW00HTH000H特殊SP07HTL000H功DPL00HTH100H能DPH00HTL100H寄存P0P3FFHSBUF器B的IP00000SCON00H状B态IE000000BPCON0B2ALE/PROG30（12

4、8051ALE1/6abca高8位地址P2A8nEAP0DiQiA07ALEGPSENOE低8位地址bP2A8nD07P0DiQiA07GALEP3.6WRWEP3.7RDOEc3PSEN4EA/VPP1:2I/O321P0�8I/O8TTL�/2P18I/O4TTL3P2�8I/O4TTL�P016�P14P3�P3.0RXDP3.1TXDP3.2INT00P3.31INT1P3.4T0/0P3.5T1/1P3.6RAMWRP3.7RAMRD�8031�8051/875180318051/8751XTAL18P08P1XTAL28P28P3+5V+5VEAL

5、ED+5V3+5VVccP2.0~P2.3A11~A8Vcc74LS373XTAL2+5VVppVcc2764GALEQ78XTAL1D7

6、A7~A0

7、Q0D0+5VRST8GND8031EP0.7

8、P0.0D7~D0CSP1.0+5VLEDEAPSENOEVssLED�ORG0000H�START:CLRP1.0�CALLDELAY�SETBP1.0�CALLDELAY�SJMPSTART�DELAY:MOVR5,#0FFH�DELAY1:MOVR4,#0FFH�DJNZR4,$�DJNZR5,DELAY1�RET2.2频率基准源计数器振荡器及定4K/8K字

9、节程序128/256字2个16位定时电路存储器ROM节数据存储时器/计数器器RAM8051CPU64K字节总可编程I/O口可编程线扩展控制4×8位串行口中断中断控制并行I/O口串行输入/输出80511.一个8CPU2.ROM4KB3.RAM128B4.215.4I/O6.16/7.58.9.通道0驱动器通道2驱动器VCC(+5V)RAM地址锁存器RAM通道0锁通道2锁ROM/存器存器EPROMGND程序地址寄存器B寄存器ACC堆栈指针SP缓冲器TMP2TMP1PC递增器PCONSCONTMODTCONALUTH0TL0TH1TL1SBUF(TX/RX)IEIP

10、程序计数器PC０PSEN定时指指PSW中断、串行口和定时器逻辑驱动器ALE和令令AE控制寄译DPTR指针RST逻辑存码器器通道1锁存器通道3锁存器振荡器通道1驱动器通道3驱动器XTAL1XTAL2P1.0～P1.7P3.0～P3.7MCS-51片内总体结构框图2.2.1CPUCPU=+������CYACF0RS1RS0OV/PD0HPSW.7PSW.6PSW.5PSW.4PSW.3PSW.2PSW.1PSW.01、(PC)ROMPCROMPC+12.2.2��1�����/�12128B300H—7FH4—23�——�A�RAM���—MOV2-2RAMD7

11、D6D5D4D3D2D1D02FH7F