|
MB85RC128A Datasheet, PDF (4/32 Pages) Fujitsu Component Limited. – 128 K (16 K × 8) ビットI2C | |||
|
◁ |
MB85RC128A
â I2C éä¿¡ã®éå§ã¨çµäº
I2C ãã¹ã¯ , 2 ç·ã ãã§éä¿¡ãå®ç¾ãããã , SDA å
¥åã®åãæãã SCL ã âLâ ã¬ãã«ã®æéå
ã«è¡ã£ã¦ãã ããã
ãã ãä¾å¤çã« , éä¿¡ã®éå§ã¨çµäºã«ã¤ãã¦ã¯ SCL ã âHâ ã¬ãã«ã®æéå
ã« SDA ãåãæãã¦ãã ããã
ã»ã¹ã¿ã¼ãã»ã³ã³ãã£ã·ã§ã³
I2C ãã¹ã , èªåºãã¾ãã¯æ¸è¾¼ã¿ã®åä½ãéå§ããã«ã¯ , SCL å
¥åã âHâ ã¬ãã«ã®æéã« , SDA å
¥åã âHâ ã¬ãã«ãã âLâ
ã¬ãã«ã«è¨å®ãã¦ãã ããã
ã»ã¹ãããã»ã³ã³ãã£ã·ã§ã³
I2Cãã¹ã®éä¿¡ãçµäºããã«ã¯, SCLå
¥åãâHâã¬ãã«ã®æéã«, SDAå
¥åãâLâã¬ãã«ããâHâã¬ãã«ã«è¨å®ãã¦ãã ã
ããèªåºãåä½ã®å ´åã«ã¯, ã¹ãããã»ã³ã³ãã£ã·ã§ã³ãå
¥åãããã¨ã§èªåºããçµäºã, ã¹ã¿ã³ãã¤ç¶æ
ã«ãªãã¾ããæ¸è¾¼
ã¿åä½ã®å ´åã«ã¯ , ã¹ãããã»ã³ã³ãã£ã·ã§ã³å
¥åã§æ¸æããã¼ã¿ã®å
¥åãçµäºã , ã¹ã¿ã³ãã¤ç¶æ
ã«ãªãã¾ãã
ã»ã¹ã¿ã¼ãã»ã³ã³ãã£ã·ã§ã³ , ã¹ãããã»ã³ã³ãã£ã·ã§ã³
SCL
SDA
âHâ or âLâ
Start
Stop
ï¼æ³¨æäºé
ï¼FRAM ããã¤ã¹ã§ã¯æ¸è¾¼ã¿åä½æ , ã¹ãããã»ã³ã³ãã£ã·ã§ã³ å¾ã®ã¡ã¢ãªæ¸è¾¼ã¿å¾
ã¡æé (tWC) ã¯å¿
è¦ãã
ã¾ããã
â ã¢ã¯ããªã㸠(ACK)
I2C ã§ã¯ , ã¢ãã¬ã¹æ
å ±ã , ã¡ã¢ãªæ
å ±ãªã©ã®ã·ãªã¢ã«ãã¼ã¿ã 8 ããã åä½ã§éåä¿¡ãã¾ããACK ä¿¡å·ã¨ã¯ , ãã®
8 ããããã¼ã¿ãã¨ã« , æ£å¸¸ã«éä¿¡ , ã¾ãã¯åä¿¡ããããã¨ã示ãä¿¡å·ã§ãã8 ãããã®éåä¿¡ãè¡ããããã³ SCL ã® 9 ã¯
ããã¯ç®ã« , åä¿¡å´ãæ¯å âLâ ã¬ãã«ãåºåãã¾ããéä¿¡å´ã§ã¯ , ãã® 9 ã¯ããã¯ç®ã§ ACK ä¿¡å·ãå信確èªãããã , ä¸
æçã«ãã¹ã解æ¾ãã¾ãããã®è§£æ¾æéä¸ã« , åä¿¡å´ã§ã¯ SDA ã©ã¤ã³ã«ãã«ãã¦ã³ãè¿ãã¦éä¿¡ãæ£å¸¸ãªãã¨ã示ãã¾
ãã
Slave å´ã , ACK âLâ ã¬ãã«å¿çåã¾ãã¯åä¿¡åã«ã¹ãããã»ã³ã³ãã£ã·ã§ã³ãåä¿¡ããå ´å , åä½ãçµäºãã¦ã¹ã¿ã³ã
ã¤ç¶æ
ã«ãªãã¾ãã
ä¸æ¹ , Slave å´ã¯ , NACK âHâ ã¬ãã«å¿çå¾ã¾ãã¯åä¿¡å¾ã«ãã¹ã解æ¾ç¶æ
ã«ãã¾ããMaster å´ã¯ , ãã®ãã¹éæ¾æéã« ,
ã¹ãããã»ã³ã³ãã£ã·ã§ã³ã¾ãã¯ã¹ã¿ã¼ãã»ã³ã³ãã£ã·ã§ã³ãçæãã¾ãã
ã»ã¢ã¯ããªãã¸ã®ã¿ã¤ãã³ã°èª¬æå³
SCL
1
2
3
8
9
SDA
Start
éä¿¡å´ã¯ 9 ãããç®ã« , å¿
ã SDA ã解æ¾ãã¦ãã ããã
ãã®ã¨ãåä¿¡å´ã¯ , ç´å 8 ãããã®åä¿¡ãæ£å¸¸ãªãã°ã
ã«ãã¦ã³ãåºåãã¾ã (ACK å¿ç )ã
ACK
4
DS501-00018-2v0-J
|
▷ |