AMC7812SPAPR datasheet(52/92 Pages) TI

52 / 92 page

From Master to Slave

A = Acknowledge

N = Not Acknowledge

S = START Condition

P = Stop Condition

Sr = Repeated START Condition

From Slave to Master

(2nd Register Address)

High Byte of Data to

2nd Register

Low Byte of Data to

2nd Register

Device

Slave Address

(1st Register Address)

High Byte of Data to

1st Register

Low Byte of Data to

1st Register

(Last Register Address)

High Byte of Data to

Last Register

Low Byte of Data to

Last Register

AMC7812

SBAS513E – JANUARY 2011 – REVISED SEPTEMBER 2013

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Writing Multiple Words to Different Registers (Figure 101)

A complete word must be written to a register (high byte and low byte) for proper operation.

1. The master device asserts a start condition.

2. The master then sends the 7-bit AMC7812 slave address followed by a zero for the direction bit, indicating a

write operation.

3. The AMC7812 asserts an acknowledge signal on SDA.

4. The master sends the first register address.

5. The AMC7812 asserts an acknowledge signal on SDA.

6. The master sends the high byte of the data word to the first register.

7. The AMC7812 asserts an acknowledge signal on SDA.

8. The master sends the low byte of the data word to the first register.

9. The AMC7812 asserts an acknowledge signal on SDA.

10. The master sends a second register address.

11. The AMC7812 asserts an acknowledge signal on SDA.

12. The master then sends the high byte of the data word to the second register.

13. The AMC7812 asserts an acknowledge on SDA.

14. The master sends the low byte of the data word to the second register.

15. The AMC7812 asserts an acknowledge signal on SDA.

16. The master and the AMC7812 repeat steps 4 to 15 until the last data are transferred.

17. The master then asserts a stop condition to end the transaction.

Figure 101. Write to Multiple 16-Bit Registers

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