????????8085A?????8051?????

1
????

• ?????2?4???????????
• ??????????????????????
• ??????????
• ????????8085A?????8051?????
• ?????,?????????????????I/O??,???,????,???
• ?????????G?
• ???SIM8085??,??PC???????????
• ?????????????
• 13????????DAC????,?ADC???,????,????,???????
• 14?8051????,???????,???LED I/O,????,ADC???

2
Chapter 1

• Digital Number Systems and Representation
• ?????????

3
????

• ??????????
• ???????
• BCD?????
• v-t?????
• ??-?????
• ??????
• ????????????
• ?????I/O?????

4
??

• ???????,??????,???CNC,????,?????,?????
• ??????????0?5,??high?low,0?1.
• ?????????1?0,??????????,???????????

5
1-1????????

• ???????????????????,??,??????????
• ????????????????,??,??????,?????CD?
• DA??????????

6
(No Transcript)
7
????

• Decimal number system 10??,?????10????
• ??1-1
• Binary number system 2??,?????2????
• ??1-2

8
??????

• 10??-2?????????,??????LSB(least significant
  bit)?MSB(most significant bit)??????????????4,8,16
  ,32 bit (binary digits)?
• ??1-31-5
• Hexadecimal number system 16??????
• 16??,?????16???,????A,B,C,D,E,F,??10-15?16???2????
  ???4-bit????????,ref. Table 1-2?
• ??1-610
• BCD??(binary-decimal system)???????????????????4-b
  it??????
• ??1-1113

9
2??,?????2????
16??????
10
????????
11
ASCII (?????????) ????,??,??(alphanumeric)?????7bi
t???ASCII???????ASCII??Ref. Table 1-4 ??1-14,1-15
12
?????? 1-21-6
13
1-11 ????(digital signals)
???0?1???,????????????????1?0(????)????????????,LS
B????(???)?
14
1-12??????(clock waveform timing)

• ??????????????????????????
• ??????(periodic clock waveform)
• ??(period),T????????????????
• ??(frequency)f??????f1/T?
• ??1-16,1-17

15
(No Transcript)
16
1-13 ??????(switch)

• ????,?????(electromechanical relay),???(diode),???
  ?
• ON1,OFF0?

17
(No Transcript)
18
1-14 ???????

• ????????(three-terminal semiconductor
  component)??(emitter,E),??(base,B),??(collector,C
  )?NPN(???)?PNP???
• NPN???????1. B?E???(5V),?C?E??(short,ON)???,B?E??
  ?(?0V),?C?E??(open,OFF)?Ref. ?1-10?
• PNP???
• ????????B,????C?E?

19
NPN???????1. B?E???(5V),?C?E??(short,ON)???,B?E??
?(?0V),?C?E??(open,OFF)?Ref. ?1-10? PNP??? ??????
??B,????C?E?
20
(No Transcript)
21
??1-18
22
1-15 TTL????(transistor-transistor logic
integrated circuit)

• ??????,???????????????
• TTL IC ???????????(complementing
  switch),????(inverter)??RTL(resitor-transistor
  logic)???DTL(diode-transistor logic)??????
• 7404?????????,14?pin?DIP(dual-in-line package)?
• ???????????IC???CMOS(complementary metal-oxide
  semiconductor),????????????????????(metal-oxide
  semiconductor filed-effect transistor,MOSFETs),??T
  TL?????????(bipolar transistor)?

23
(No Transcript)