DS1307 not running?

[Sabahan]

After I post this question here ,I retry my setup and it start functioning,I had not change anything,the unsuccessful attempt maybe due to the ripple from my power supply,I had added two filter capacitor to the setup,the earlier setup may have cause the mcu keep restarting itself.

[richard]

glad to see you got it to go

steve
here is an extract from the pbp3 manual

The upper 7 bits of the Control byte contain the control code along with chip select or additional address information, depending on the particular device. The low order bit is an internal flag indicating whether it is a read or write command and should be kept clear.

as I said bit 0 is set as required by the pbp complier

[EarlyBird2]

Richard,

I am amazed that it works using $D0 for read and write control. Simply because this is not how others have coded the I2C instruction for this device in the past and it worked for them. Also the data sheet is very specific on the procedure to use for write and read procedures which obviously PBP3 is not following but still works.

Does this mean that read the manual and the data sheet is no longer good advice?

[EarlyBird2]

Mystery solved, in my mind anyway, The I2C command has been changed in PBP3 and the PBP3 manual does point this out. So older code written for previous versions of PBP needs modifying accordingly. When reading the data sheets these changes need to be taken into account.

[richard]

simple explanation for their success is as I said in post 13 .
bit 0 is set as required by the pbp complier .
probably should have said
bit 0 is set and or cleared as required by the pbp complier.
but the book indicates bit0 should always be 0
the 24lcxxx example in the manual makes usage of this (Address) function fairly clear I think

[EarlyBird2]

I found #16 a better explanation. Thanks again.