Curs SMP 7 - Circuite s uport (pe rife rice ) pe mtru...

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1 Circuite suport (periferice) pemtru microprocesoare 8254, 8279 si altele
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2 Ceas programabil 8254 – schema bloc Contor 0 Contor 1 Contor 2 Tampon mag date Logica R/W Reg. cuvant cda. CLK 1 GATE 1 OUT 1 CLK 2 GATE 2 OUT 2 CLK 0 GATE 0 OUT 0 D 7 – D 0 RD/ WR/ A 1 A 0 CS/
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3 FORMATUL CUVANTULUI DE STARE D7 D6 D5 D4 D3 D2 D1 D0 SC 1 SC 0 RW/W 1 RW/W 0 M 2 M 1 M 0 BCD
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4 Definirea comenzii SC 1 SC 0 0 0 Selectare contor 0 0 1 Selectare contor 1 1 0 Selectare contor 2 1 1 Comanda citire
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5 Read / Write RW/W 1 RW/W 0 0 0 Comanda memorare contor 0 1 R/W octetul mai semnificativ 1 0 R/W octetul mai putin semnificativ 1 1 R/W octetul mai putin semnificativ, apoi cel mai semnificativ
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6 Moduri de functionare M 2 M 1 M 0 0 0 0 Mod 0 0 0 1 Mod 1 X 1 0 Mod 2 X 1 1 Mod 3 1 0 0 Mod 4 1 0 1 Mod 5
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7 8086 Matrice de taste 8259A PIC Decodificator 1/8 Decodif. 1/16 Latch adrese Decod adrese 5V GND 8 coloane 8 randuri D 7 – D 0 INT CS/ RESET A 0 IOR/ IOW/ CLK BD/ Blank Display Adrese decodificate Date afisate AFISAJ Shift Control INTR A 19 – A 16 AD 15 – AD 0 M / IO/ RD/ WR/ A 19 – A 0 IRQ 0 IRQ 7 D 15 D 8 A 0 A 3 – A 1 8279 SHIFT CNTL RL 7-0 INT V DD V SS SL 3-0 D 7 – D 0 CS/ RESET RESET A 0 IOR/ IOW/ CLK PCLK B 3-0 A 3-0 BD/ Schema cu 8086 si 8279
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8 Accesul la registrele 82C54 CS/ RD/ WR/ A 1 A 0 0 1 0 0 0 Scrie Contor 0 0 1 0 0 1 Scrie Contor 1 0 1 0 1 0 Scrie Contor 2 0 1 0 1 1 Scrie Cuvant comanda 0 0 1 0 0 Citeste din Contor 0 0 0 1 0 1 Citeste din Contor 1 0 0 1 1 0 Citeste din Contor 2 0 0 1 1 1 NOP (Tristate) 1 X X X X NOP (Tristate) 0 1 1 X X NOP (Tristate)
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9 Formatul comenzii de citire D 7 D 6 D 5 D 4 D 3 D 2 D 1 D 0 1 1 COUNT/ STATUS/ CNT2 CNT1 CNT0 0
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10 Formatul cuvantului de stare D 7 D 6 D 5 D 4 D 3 D 2 D 1 D 0 OUTPUT NULL COUNT RW 1 RW 0 M 2 M 1 M 0 BCD
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11 8254 Modul 0 – Numarator de evenimente CLOCK WR/ n GATE OUT (INT) 4 3 2 1 0 4
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12 Modul 0 - Cont CLOCK WR/ n GATE OUT (INT) 4 3 2 1 0 4
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13 Modul 1 CLOCK WR/ n GATE OUT (INT) 4 3 2 1 0 4
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14 Modul 1 - Cont CLOCK WR/ n GATE OUT (INT) 4 3 2 1 0 4 4 3
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15 Modul 1 - Cont CLOCK WR/ n GATE OUT (INT) 2 1 0 3 3 2 1 0 3
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16 Modul 2 CLOCK WR/ n GATE OUT (INT) 2 1 0 3 3 2 1 0 3 2 3
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17 Modul 2 - Cont CLOCK WR/ n GATE OUT (INT) 2 1 0 2 2 1 0 2 1 0 3 3 3
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18 Modul 3 CLOCK WR/ n GATE OUT (INT) 2 1 0 3 3 2 1 0 3 2 3
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19 Modul 3 - Cont CLOCK WR/ n GATE OUT (INT) 2 1 0 2 2 1 0 2 1 0 3 3 3
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Curs SMP 7 - Circuite s uport (pe rife rice ) pe mtru...

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