?8? 80C51???????

1
?8? 80C51???????
I2C??????
8.1
SPI????????
8.2
8.3
????????DS1302????
2
8.1 I2C????????
8.1.1 I2C????

• I2C????

???????????SDA????SCL
3

• I2C?????

• ??2??
• ?????,???????,???????,?????

• ?????
• ????100Kb/s,????400Kb/s,?????3.4Mb/s

• ???/??????????
• ???80C51??I2C????,?????????(???????)

4

• I2C???????

• ?????

• ????S
• ????P

5

• ???????

• ????

? D7 D6 D5 D4 D3 D2 D1 D0
???? ???? ???? ???? ???? ???? ???? R/W
6

• ?????

???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ??? ??? ??? ???? ???
???? ???? ???? ???? ???? ???? ? ? ? ? ? ? R/W ???? ??? ??? ??? ???? ???
AT24C01A 128 1 0 1 0 A2 A1 A0 1/0 1 8 8
AT24C02 256 1 0 1 0 A2 A1 A0 1/0 1 8 8
AT24C04 512 1 0 1 0 A2 A1 P0 1/0 1 16 4
AT24C08A 1K 1 0 1 0 A2 P1 P0 1/0 1 16 2
AT24C16A 2K 1 0 1 0 P2 P1 P0 1/0 1 16 1
AT24C32A 4K 1 0 1 0 A2 A1 A0 1/0 2 32 8
AT24C64A 8K 1 0 1 0 A2 A1 A0 1/0 2 32 8
AT24C128B 16K 1 0 1 0 A2 A1 A0 1/0 2 64 8
AT24C256B 32K 1 0 1 0 A2 A1 A0 1/0 2 64 8
AT24C512B 64K 1 0 1 0 A2 A1 A0 1/0 2 128 8
7
8.1.2 80C51?I2C??????

• I2C??????????

8

• I2C???????????

• ????
• STASETB SDA
• SETB SCL
• NOP
• NOP
• CLR SDA
• NOP
• NOP
• CLR SCL
• RET

• ?????1
• NASSETB SDA
• SETB SCL
• NOP
• NOP
• CLR SCL
• CLR SDA
• RET

• ????0
• ASKCLR SDA
• SETB SCL
• NOP
• NOP
• CLR SCL
• SETB SDA
• RET

• ????
• STPCLR SDA
• SETB SCL
• NOP
• NOP
• SETB SDA
• NOP
• NOP
• CLR SDA
• CLR SCL
• RET

?????
SDA EQU P1.7 SCL EQU P1.6
9
8.1.3 80C51?AT24C02???
AT24C02???E2PROM??????????????I/O???,??????
WP??????,????????
10

• ?????

• ?????????S
• ?????????,??SDA?
• ??????????????,?SDA?????

• ?????1???????????
• ??????---
• ?????????P
• ???????(10ms???)

11

• ?????

• ?????????S
• ?????????(??),??SDA?
• ??????????????,?SDA?????

• ?????1???????????
• ??????
• ???????????S??????
• ??????
• ???????????----
• ?????????????????P

(???)
12
8.2 SPI????????
??E2PROM?A/D?D/A?????????????SPI???
8.2.1 ?????SPI???????
??80C51,????MCU??????????
4???
13
8.2.2 ???SPI???????
????(?????)?,?????????,SCK?????????????MISO??,????
????MISO?,??????????SCK??????????,??????
????(?????)?????
14
??8-3???????SPI?????E2PROM??X25F008????????? ?
???????(?????R0?)
SPIRDSETB SCK CLR SS MOV R1,8
RLPCLR SCK NOP NOP MOV C,
MISO RLC A SETB SCK DJNZ
R1,RLP MOV R0,A RET
????????? MOSI EQU P1.0 SCK EQU P1.1 SS
EQU P1.2 MISO EQU P1.3
(????)
15
8.3 ????????DS1302????
DS1302,??????/???31????RAM
8.3.1 DS1302??????

• ????

• ??2100 ??????????????????,???????
• 31????RAM
• ???TTL ??
• ??????300nA,?????????????

16

• ????

• I/O????/????
• SCLK????????
• RST????
• GND????
• Vcc1?Vcc2???????????
• X1?X2????????????32.768KHz?

17
8.3.2 DS1302???

• ?????

? D7 D6 D5 D4 D3 D2 D1 D0
1 R/C A4 A3 A2 A1 A0 R/W

• D7????1
• R/C??0???????,?1?????RAM
• A4A3A2A1A0????
• R/W??0??????,?1??????

18

• ?????

• ???

• ???

19

• ?????(????)

???????8??????????31???RAM??????????,???A0A4??
11111 ?
20
8.3.3 DS1302?????RAM

• ?????????

???? ???? ???? ? ? ??? ??? ??? ??? ??? ??? ??? ???
???? ? ? ? ? D7 D6 D5 D4 D3 D2 D1 D0
? 80H 81H 0059 CH ???? ???? ???? ???? ???? ???? ????
? 82H 83H 0059 0 ???? ???? ???? ???? ???? ???? ????
? 84H 85H 0112?0023 12/24 0 A/P HR ???? ???? ???? ????
? 86H 87H 0131 0 0 ???? ???? ???? ???? ???? ????
? 88H 89H 0112 0 0 0 0/1 ???? ???? ???? ????
?? 8AH 8BH 0107 0 0 0 0 0 ??? ??? ???
? 8CH 8DH 0099 ???? ???? ???? ???? ???? ???? ???? ????
21
?? 1??????CH? ?1,????,?????? ?0,????? 2???????
D7? ?1,12???(D5?1????,?0????) ?0,24???(??D5?D4??
?????)?
22

• ??????RAM

???? ???? ???? ? ? ??? ??? ??? ??? ??? ??? ??? ???
???? ? ? ? ? D7 D6 D5 D4 D3 D2 D1 D0
??? 8EH 8FH 00H80H WP 0 0 0 0 0 0 0
???? 90H 91H - TCS TCS TCS TCS DS DS RS RS
???? BEH BFH - - - - - - - - -
RAM?? FEH FFH - - - - - - - - -
RAM0 C0H C1H 00HFFH RAM?? RAM?? RAM?? RAM?? RAM?? RAM?? RAM?? RAM??
00HFFH RAM?? RAM?? RAM?? RAM?? RAM?? RAM?? RAM?? RAM??
RAM30 FCH FDH 00HFFH RAM?? RAM?? RAM?? RAM?? RAM?? RAM?? RAM?? RAM??
23
?? 1?WP??????1?,?????0?,????? 2?TCS1010????D
S?01,??????,?10,?2????11?00,????? 3?RS??????????
?00,???01,2KO??10,4KO??11,8KO???
24
8.3.4 DS1302???????

• ????

• ????(?)

25

• Thank You !