Post by thread:[PIC]: Dalls DS1307 clock chip and I2C

yes , have done some project with that using atmel mcu. regards, ckchan Jean-Michel Howland wrote: {Quote hidden}> Hi all, > > Can someone who has used the Dalls DS1307 clock chip actually confirm that > the 2 wire interface it has is I2C compatible? The data sheet NEVER > mentions I2C. > > Regards > Jean-Michel. > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > use .....listservKILLspam@spam@mitvma.mit.edu?body=SET%20PICList%20DIGEST -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use listservKILLspammitvma.mit.edu?body=SET%20PICList%20DIGEST

At 11:38 PM 11/1/00 +0800, you wrote: >Hi all, > >Can someone who has used the Dalls DS1307 clock chip actually confirm that >the 2 wire interface it has is I2C compatible? The data sheet NEVER >mentions I2C. Symptomatic of not paying a licence fee to phillips. -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use .....listservKILLspam.....mitvma.mit.edu?body=SET%20PICList%20DIGEST

>yes , have done some project with that using atmel mcu. Thank you for setting my mind at ease. Regards Jean-Michel. > > >regards, >ckchan > > >Jean-Michel Howland wrote: > >> Hi all, >> >> Can someone who has used the Dalls DS1307 clock chip actually confirm that >> the 2 wire interface it has is I2C compatible? The data sheet NEVER >> mentions I2C. >> >> Regards >> Jean-Michel. >> >> -- >> http://www.piclist.com#nomail Going offline? Don't AutoReply us! >> use EraseMElistservspam_OUTTakeThisOuTmitvma.mit.edu?body=SET%20PICList%20DIGEST> > >-- >http://www.piclist.com#nomail Going offline? Don't AutoReply us! >use listservspam_OUTmitvma.mit.edu?body=SET%20PICList%20DIGEST> > > > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use @spam@listservKILLspammitvma.mit.edu?body=SET%20PICList%20DIGEST

It was sometime ago since I used the ds1307. It definitely works with i2c functions, and I dug some out for you (these examples should work with CCS PCM compiler (although I cannot check the format exactly because I no longer use that compiler). The DS1307 data sheet seems to indicate that you can send it an address of any of the registers and then read or write to that register. I found that it would only work if you addressed location 00 and allowed it to increment itself to get to the higher registers. Also check whether your i2c routines require a pull up resistor on both the SCL and SDA lines. The CCS compiler i2c functions required both resistors, example assembler code from Microchip required a pull up on only the SDA line. Hope this helps James Hillman void reset_ds1307() //set all ds1307 time registers to zero { i2c_start(); i2c_write(0xD0);://device address and write bit set i2c_write(0x00); //register pointer address start byte i2c_write(0x00); //register 00 seconds i2c_write(0x00); //register 01 minutes i2c_write(0x00); //register 02 hours i2c_write(0x01); //register 03 day i2c_write(0x01); //register 04 date i2c_write(0x01); //register 05 month i2c_write(0x00); //register 06 year i2c_write(0x13); //register 07 control sqwe enabled, 32kHz i2c_stop(); // register 07 written to in main() setup delay_ms(500); //arbitrary delay to allow ds1307 to settle } void read_ds1307() //read time registers into real_time[] { byte i; i2c_start(); i2c_write(0xD0); i2c_write(0x00); file://start address i2c_start(); i2c_write(0xD1); file://read command for(i=0;i<7;++i) real_time[i]=i2c_read(); file://read registers 00 to 06 real_time[7]=i2c_read(0); file://end the read by not acknowledging i2c_stop(); file://control byte in real_time[7] } {Original Message removed}

Ignore my last post. I see a DS part number and i thing of 1-wire. Sorry Murray ----- Original Message ----- From: Jean-Michel Howland <KILLspamvegeKILLspamVMAPA.COM> To: <RemoveMEPICLISTTakeThisOuTMITVMA.MIT.EDU> Sent: Wednesday, November 01, 2000 7:38 AM Subject: [PIC]: Dalls DS1307 clock chip and I2C {Quote hidden}> Hi all, > > Can someone who has used the Dalls DS1307 clock chip actually confirm that > the 2 wire interface it has is I2C compatible? The data sheet NEVER > mentions I2C. > > Regards > Jean-Michel. > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > use spamBeGonelistservspamBeGonemitvma.mit.edu?body=SET%20PICList%20DIGEST > > > > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use TakeThisOuTlistservEraseMEspam_OUTmitvma.mit.edu?body=SET%20PICList%20DIGEST

I use a DS1307 and it sure is I2C. Not a bad chip either. ----- Original Message ----- From: "Murray Snowden" <RemoveMEmursnowTakeThisOuTMINDSPRING.COM> To: <PICLISTEraseME.....MITVMA.MIT.EDU> Sent: Wednesday, November 01, 2000 4:09 PM Subject: Re: [PIC]: Dalls DS1307 clock chip and I2C {Quote hidden}> No it doesn't support I2C. > > Its a 1-wire network. Check out http://www.iButton.com. All the examples on site > use Java or C programs running from PC or the TINI board. > > You may find some examples using PIC, but limited examples. > > Murray > ----- Original Message ----- > From: Jean-Michel Howland <EraseMEvegeVMAPA.COM> > To: <RemoveMEPICLISTEraseMEEraseMEMITVMA.MIT.EDU> > Sent: Wednesday, November 01, 2000 7:38 AM > Subject: [PIC]: Dalls DS1307 clock chip and I2C > > > > Hi all, > > > > Can someone who has used the Dalls DS1307 clock chip actually confirm that {Quote hidden}> > the 2 wire interface it has is I2C compatible? The data sheet NEVER > > mentions I2C. > > > > Regards > > Jean-Michel. > > > > -- > > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > > use RemoveMElistservspam_OUTKILLspammitvma.mit.edu?body=SET%20PICList%20DIGEST> > > > > > > > > > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > use RemoveMElistservTakeThisOuTspammitvma.mit.edu?body=SET%20PICList%20DIGEST > > > > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use EraseMElistservspamspamBeGonemitvma.mit.edu?body=SET%20PICList%20DIGEST

Yes, definitely I2C. I am using it. Chris ----- Original Message ----- From: "Jean-Michel Howland" <RemoveMEvegeKILLspamVMAPA.COM> Sent: Wednesday, November 01, 2000 3:38 PM Subject: [PIC]: Dalls DS1307 clock chip and I2C > Hi all, > > Can someone who has used the Dalls DS1307 clock chip actually confirm that > the 2 wire interface it has is I2C compatible? The data sheet NEVER > mentions I2C. > > Regards > Jean-Michel. > -- http://www.piclist.com hint: To leave the PICList piclist-unsubscribe-requestSTOPspamspam_OUTmitvma.mit.edu

Yes, nice save Murray. Chris ----- Original Message ----- From: "Murray Snowden" <spamBeGonemursnowSTOPspamEraseMEMINDSPRING.COM> Sent: Wednesday, November 01, 2000 9:23 PM Subject: Re: [PIC]: Dalls DS1307 clock chip and I2C {Quote hidden}> Ignore my last post. I see a DS part number and i thing of 1-wire. > > Sorry > > Murray > ----- Original Message ----- > From: Jean-Michel Howland <KILLspamvegespamBeGoneVMAPA.COM> > To: <EraseMEPICLISTEraseMEMITVMA.MIT.EDU> > Sent: Wednesday, November 01, 2000 7:38 AM > Subject: [PIC]: Dalls DS1307 clock chip and I2C > > > > Hi all, > > > > Can someone who has used the Dalls DS1307 clock chip actually confirm that {Quote hidden}> > the 2 wire interface it has is I2C compatible? The data sheet NEVER > > mentions I2C. > > > > Regards > > Jean-Michel. > > > > -- > > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > > use @spam@listserv@spam@spam_OUTmitvma.mit.edu?body=SET%20PICList%20DIGEST> > > > > > > > > > -- http://www.piclist.com hint: To leave the PICList spamBeGonepiclist-unsubscribe-requestKILLspammitvma.mit.edu