Phn 1 : Gii Thiu Led 7 on

P0 : Data P2 : SelectP0.0 : a P2.0 : Led 1P0.1 : b P2.0 : Led 2P0.2 : c P2.0 : Led 3P0.3 : d P2.0 : Led 4P0.4 : e P2.0 : Led 5P0.5 : f P2.0 : Led 6P0.6 : g P2.0 : Led 7P0.7 : dot P2.0 : Led 8

C hai loi Led 7 on l Led Anode chung v Led Cathode chung V cu to :Led 7 thanh c cu to t 7 diode ghp theo dng thanh-Nu ni cc cc Anode vi nhau gi l Anode chungv vi Ktot cng tng t.Cch s dng : Nu l Anode chung , c ngha l chn Anode ni ln ngun (mc 1) th d liu a vo 7 chn d liu A B C D E F G s l mc thp (0) th led 7 on s tch cc (s sng) ty vo d liu cc bn a vo. Vi led 7 thanh ktot chung cng ngc li , d liu vo cc chn A B C D E F G L Mc cao (mc 1) mi tch cc.

Phn 2 : Qut Led 7 on Nguyn l qut led 7 on hin th 1 led 7 on, ta cn 8 chn gi d liu cho n. Nh vy, vi 8 led 7 on, theo kt ni bnh thng,ta cn tng cng 56 ng tn hiu thp sng 8 led cng lc. khc phc vic tn ti nguyn ny, ngi ta dng k thut qut led. Ti 1 thi im, ch c 1 led sng. Ti thi im t1 ch c led 1 sng, ti thi im t2 = t1 + t0 ch c led 2 sng, khi t0 rt nh, mt ngi khng th nhn bit c nhp nhy gia 2 ln lun chuyn, v s c cm gic l 2 n sng cng lc.

qut led, s nguyn l s c mc nh trn. Port 2 gi l port d liu, d liu ny s c ni vi tt c cc led. Port 1 dng chn led, cc E ca transitor c ni vi chn mass ca led 7 on.

Port 1 bng 1 ti bit no th transitor tng ng s dn. Gi s Port 1 = 0x80, transitor T4 dn, dng data s i qua led 7 on ni vi T4 xung t, v led ny s sng, cc led cn li th khng.Khi s lng led cng nhiu, ta phi tnh ton tm ra s t0 hp l.Thng thng, khong thi gian ti a gia led u tin v led cui cng trong khi qut led phi nh hn 1/50 giy (50Hz).

Phn 3 : Hng Dn S Dng Keil C v Flash Magic 3.1 Ci t Keil CKeil C l chng trnh h tr kh y ngi dng son tho chng trnh dnh cho cc vi iu khin thuc h 8051. ci t bn tin hnh theo cc bc nh sau:

Bc 1 : Click vo file c51v815.exe trong CD i km, mn hnh sau s xut hin

Bc 2 : Chn Next, mn hnh sau s xut hin.

Bc 3 : Click chn I agree v chn Next, mn hnh sau s xut hin.

Bc 4 : Bn c th mc nh v chn Next. Tuy nhin bn c th thay i Destinatioin Folder, l th mc cha 1 s th vin h tr trong vic lp trnh trn Keil C. Mn hnh sau xut hin bn in 1 s thng tin c nhn.

Bc 5 : Chn Next bt u ci t

Bc 6 : Khi ci t xong, mn hnh sau xut hin v bn nhn Finish hon ttqu trnh ci t.

Bc 7 : Trang web sau hin th gii thiu v KeilC phin bn ny.

Cc bc cu hnh cho Keil C dch chng trnh ra file Hex s c trnh by trong bi thc hnh tip theo.

3.2 Ci t Flash Magic

y l chng trnh dng np file Hex cho 89V51. ci t bn lm theo ccbc sau :Bc 1 : Double click vo file FlashMagic.exe, mn hnh sau s xut hin

Bc 2 : Chn Next

Bc 3 : Click chn I accept v chn Next

Bc 4 : Bn c th mc nh v chn Next, hoc thay i ng dn ca th mc cit nu bn mun. Khi click Next mn hnh sau s xut hin.

Bc 5 : mc nh v chn Next

Bc 4 : Bn c th mc nh v chn Next, hoc thay i ng dn ca th mc cit nu bn mun. Khi click Next mn hnh sau s xut hin.

Bc 5 : mc nh v chn Next

Bc 6 : Chn Next.

Bc 7 : Chn Install ci t.

Bc 8 : Khi ci t xong mn hnh sau s xut hin, bn nhn Finish kt thc ci t.

3.2.1 Cu hnh cho Flash Magic

Bc 1 : Khi ng Flash Magic t mn hnh Desktop (hoc vo Start\ProgramFiles\Flash Magic v chn Flash Magic), mn hnh sau s xut hin

Bc 2 : Bn chn Baud Rate l 9600, Device l chip tng ng m bn dng. Check chn Verify after programming v Erase blocks used by Hex File.

Bc 3 : Chn menu Option v chn Advance Option, mn hnh sau s xut hin :

Bc 4 : Chn qua tab Hardware Config v check chn Assert DTR and RTSwhile COM Port open. Nhn OK ng ca s ny li.

Bc 5 : Xem cng COM ang l cng no. Bn thu nh Flash Magic li, trn mn hnh Desktop, t biu tng My Computer, click phi chut v chn Manage.

Bc 6 : Mn hnh sau xut hin, bn chn Device Manager.

Bc 7 : Cm dy cng COM nu bn ang dng USB to COM, m rng Ports(COM &LPT), bn s bit c tn cng COM ang dng (trong v d ny l COM 9).

Bc 9 : Kch hot li Flash Magic v chn cng COM tng ng.