AN1759 datasheet(8/24 Pages) FREESCALE

Part #	AN1759

Description	Add a Non-Volatile Clock to the MC68HC705J1A

PDF	24 Pages

Scroll/Zoom	100%

Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

Direct Link	http://www.freescale.com

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Application Note

AN1759

Figure 6. Acknowledge Timing

2-Wire Protocol

Example

An example of the protocol needed to write $10 to address $07 of the

DS1307 is:

1. The master transmits a start transfer.

2. The master transmits the DS1307 7-bit identification code,

%1101000.

3. Since this is a data write transfer, the master then transmits a 0.

4. Since a byte has just been transmitted, the receiver (DS1307) will

now send out a LOW to acknowledge the transfer.

5. The master reads the SDA pin for a LOW.

6. The master sends out the address of $07 to the DS1307 and

receives back an acknowledge.

7. The master sends out the data, $10, to the DS1307 and receives

back an acknowledge. The DS1307 writes $10 to address $07.

8. Finally, a stop transfer is sent to the DS1307 to complete the

transaction.

SCL

SDA

ACK FROM SLAVE

SCL

SDA

ACK FROM MASTER

IF LAST RECEIVE, SDA IS HIGH

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AN1759 Datasheet(PDF) 8 Page - Freescale Semiconductor, Inc