Question

write an assembly language to design a countdown timer

9. Countdown Timer To design a countdown timer with voice prompts. Requirements: Understanding the principle of the timer counter. After setting timing (>1min), the remaining time is displayed on digital tube. Voice prompts appear at the moment of final 30s. When the given time is up, the bell starts to ring. In addition, it needs pause key and other necessary functions 25

Answer 1

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IST mes Joto bte-fsc portbi3 rto tens btfsc portho Jeto delay oto bet deaf ox0,1 230 1/7 2A goes mov-t Ox20,0 movuat ox2yt Su bluo orf 1 btfsc, status,2 201 10 s4 ol05y T21t CLo goto aft Call ead movof pottdda2 oto gead movt ox4,0 poc Sublo bt-fsc status 2a goto al mov-f 0x24,0 12X0 /0d Subleo 2 bt.lse status, 9oto Foou ox24,O Of op a2 C+7012 X subluo 4 btfsc status,2 9oto mov ox24, 0 ln ay Sublws !caucnx btdsc status toi ro al.34 Nhr 043D dbb tad goto

muutOx Sublw 6 bt-fsc status,2 Joto mou-f ox24.0 Sublio mov- oxo4, 0 Sublw &nl btfsc status,2 off W a6 9oto mou ox24, Sublw 9 a s bt-fsc status 2 goto ag movt ox24/o Sublo o btfsc.status,z CB oohe goto movlo 9 mov w ox20 decf oxo movf ox2o movwt or24 ao aff Su bluo ox T bt-fse statuS,2 to again call lvecrt tead marol pote mouluo iolttb goto poc mouleo tob setuan Moulrs tollolth eturn

movho 10oli b O3 retuan Movo tooltob ay Tetunn prer maulo 1ollotbl n1olb J2 moulio a6 Betuoo moulo 1 b Tetuon movlo 11tb 17! 98 Teusn moulo 1011ttb vetn moulw t11tIb ao vetago dvort dedory mouluo oxo3 Mavwt ox30 dee dects2 Ox30, o 9oto csee decfsz ox31 1 goy 21-18 erto movluo or39 rooulo ox31 Coee rto goes inon uool btise portb,2 yy ones goto dec Or2o1 ones mout oxso0 movwt o29

Subluo ox.ff bttsc status2 call cho Tead roovte potd call tens biisc po1tb3 guto tens decf oxat mou oxotio movwt ox24 Su bluo oxff bulse status,2 call chrt Call mov porte goto movles 9 move oxo movwt ox24 bet chro netun mouluo 9 movwf ox movwt ory chrt retuan end