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ൺѧҵƣģֽ
շģһףUSBת豸һףһףءɡ
1.2
õϵͳwindows xp,õvc,ģõKeil C,protel,proteusȡ
5
ҳ
ൺѧҵƣģֽ
2 С
СеĺģϵͳִߡСƵϵͳִЧʡ
2.1 СӲṹ
2.1.1 оƬѡ
һõƬΪоƬAT89S5232I/OڣСֶI/OڵֻһƬԺܺõĿС
˫ƬΪоƬAT89S52ֱСĸֽмͿƣȻ˵ƬĸϵͳĹЧʣǴںܶI/OԴ˷ѣƬƣԲø÷ʹ÷һ
2.1.2 ҪоƬ
A AT89S52оƬ[6]
ͼ2-1
ҳ 6
ൺѧҵƣģֽ
AT89S52 һֵġCMOS8λ 8K ϵͳɱFlash 洢ʹAtmel ˾ܶȷ ʧԴ洢죬빤ҵ80C51 ƷָȫݡƬFlash洢ϵͳɱ̣ ڵоƬϣӵɵ8 λCPU ϵͳ ɱFlashʹAT89S52ΪڶǶʽӦϵͳ ЧĽ
AT89S52±ܣ 8kֽFlash256ֽRAM 32 λI/O ߣŹʱ2 ָ룬16 λ ʱ/һ62жϽṹȫ˫пڣ Ƭھʱӵ·⣬AT89S52 ɽ0Hz ̬ ֧2ѡڵģʽģʽ£CPU ֹͣRAMʱ/ڡжϼ 籣ʽ£RAMݱ棬ᣬ ƬһйֱֹͣһжϻӲλΪֹ
P0 ڣP0һ8λ©·˫I/Oڡ
P1 ڣP1 һڲ8 λ˫I/O ڣp1 4 TTL ƽ
⣬P1.0P1.1ֱʱ/2ⲿ루P1.0/T2Ͷʱ/2 Ĵ루P1.1/T2EX flash̺УʱP1ڽյ8λַֽڡ
P2 ڣP2 һڲ8 λ˫I/O ڣP2 4 TTL ƽ
P3 ڣP3 һڲ8 λ˫I/O ڣp3 4 TTL ƽ
⣬P3ڻһЩFLASH̺ͳУĿźš RSTλ롣ʱRSTųϸߵƽǵƬλ
ALE/PROGⲿ洢ݴ洢ʱALEַַĵ8λֽڡһ£ALEʱƵʵ1/6̶źţɶʱӻڶʱĿġҪעǣÿ
ҳ 7
ൺѧҵƣģֽ
ⲿݴ洢ʱһALE塣FLASH洢ڼ䣬Ż壨PROGбҪܼͨĴSFRе8EHԪD0λλɽֹALEλλֻһMOVXMOVCָܽALE⣬ŻᱻߣƬִⲿʱӦALEֹλЧ
PSENPSENⲿ洢ĶѡͨźţAT89S52ⲿ洢ȡָݣʱÿPSENЧ壬ڴڼ䣬ⲿݴ洢PSENźš
EA/VPPⲿʹCPUⲿ洢ַΪ0000H-FFFFHEA˱뱣ֵ͵ƽӵأעǣλLB1̣λʱڲEA״̬EAΪߵƽVccˣCPUִڲ洢ָFLASH洢ʱż+12VıԴVppȻǸʹ12V̵ѹVpp
XTAL1Ŵڲʱӷ·ˡ XTAL2Ŵˡ
B L293DоƬ
ͼ2-2
L293D[7]ͨڲʹźšH-ŵ·תʹźſPWM⣬L293D2H-ŵ·
ҳ 8