| ??? 09/19/09 16:15 Read: times |
#168982 - The CODE is here,please guide Responding to: ???'s previous message |
Yes only Atmel AT24C02 datasheet tell me that, not others! Datasheet like NM24C02 from FAIRCHILD, 24C02SC from MICROCHIP, IS24C02 from ISSI, do not talk about memory reset.
I have not seen any code for I2C, including this site's code library, that contains code for memory reset. I as a beginner do think that memory reset of I2C device is mandatory in bus master's firmware as a precautionary measure, even if datasheets do not mention it. Therefore the code I wrote is as follows should be inserted in the system initialization area of the bus master's firmware Please guide if the code is alright It is assumed that an AT89C51 is running at 12Mhz and SCL is 100 Khz, I2CRESET:setb SCL
setb SDA
acall DELAY ; a DELAY for 5 uS inserted
clr SDA ;Start condition
acall DELAY
clr SCL
nop
setb SDA ;SDA raised
mov r5,#9
acall DELAY
NINE: setb SCL ;9 (NINE) clocks applied
acall DELAY
clr SCL
nop
nop
nop
djnz r5,NINE
setb SCL
acall DELAY
clr SDA ;Start condition
acall DELAY
clr SCL
acall DELAY
setb SCL
acall DELAY
setb SDA ;Stop condition
DELAY: nop
ret
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| Topic | Author | Date |
| I2C memory reset | 01/01/70 00:00 | |
| What does the Datasheet tell you | 01/01/70 00:00 | |
| The CODE is here,please guide | 01/01/70 00:00 | |
| What, exactly, did the datasheet tell you? | 01/01/70 00:00 | |
| Link to the Datasheet is here .... | 01/01/70 00:00 | |
| So what is you question? | 01/01/70 00:00 | |
| So the QUESTION is .... | 01/01/70 00:00 | |
| Bus reset to get I2C listeners back to "idle" | 01/01/70 00:00 | |
Thanks to Westermark | 01/01/70 00:00 | |
| adhere to the datasheet of the one you're using | 01/01/70 00:00 | |
| Who don't know this ! | 01/01/70 00:00 | |
| you're being encouraged to do your own thinking | 01/01/70 00:00 |