BT 5. Bi tp:BT 5.3.1. Xy dng mch gii m a ch cho vi mch PPI 8255 c a ch c s l 300h bng cc vi mch AND, OR, 74138 , Xc nh gi tr t iu khin thit lp ch cho vi mch PPI 8255 lm vic nh sau: PA: mode 0, vo; PB: mode 0, ra; PC thp: ra, PC cao: vo.BT 5.3.2. Xy dng mch gii m a ch cho vi mch PPI 8255 c a ch c s l 304h bng cc vi mch AND, OR, 74138 , Xc nh gi tr t iu khin thit lp ch cho vi mch PPI 8255 lm vic nh sau: PA: mode 0, ra; PB: mode 0, vo; PC thp: ra, PC cao: vo.BT 5.3.3. Xy dng mch gii m a ch cho vi mch PPI 8255 c a ch c s l 310h bng cc vi mch AND, OR, 74138 , Xc nh gi tr t iu khin thit lp ch cho vi mch PPI 8255 lm vic nh sau: PA: mode 0, ra; PB: mode 1, vo; PC thp: vo, PC cao: ra.BT 5.3.4. Cho s ghp ni mt vi mch ADC vi cng my in (LPT1) ca my tnhPC nh sau:Bt u

Khi to cng my in

To xung Start2 - 9LPT1 16 (/C2)13 (S4)

8DataADCStartFinish

S Finish = 1

c d liuKt thc

Yu cu:Vit chng trnh iu khin hot ng ca vi mch ADC theo lu nh hnh bn. Bit rng xung iu khin tn hiu Start l mt xung dng. Cc tn hiu iu khin c ni vo cc chn ca cng LPT1 (a ch c s = 378h) c s chn nh hnh v#include

#include

#define dataR 0x378

#define statusR 0x379

#define controlR 0x37A

Int data;

Void docDL()

{

Outp(controlR,inp(controlR)|0x04);

Delay(10);

Outp(controlR,inp(controlR)|0xFB);

Int Kt=inp(statusR)&0x10;While(kt==0);

Data=inp(dataR);

}

Void main()

{

While(!kbhit())

{

DocDL();

Cout