AMC7812BSPAP datasheet(53/92 Pages) TI1

53 / 92 page

Device

Slave Address

(Register Address)

Device

Slave Address

From Master to Slave

A = Acknowledge

N = Not Acknowledge

S = START Condition

P = Stop Condition

Sr = Repeated START Condition

From Slave to Master

From High Byte of

Device Register

From Low Byte of

Device Register

AMC7812B

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SBAS625A – SEPTEMBER 2013 – REVISED SEPTEMBER 2013

Reading a Single Word from Any Register (Figure 102)

Figure 102 shows a diagram of this protocol. Steps for this protocol are:

1. The master device asserts a start condition.

2. The master then sends the 7-bit AMC7812B slave address followed by a '0' for the direction bit, indicating a

write operation.

3. The AMC7812B asserts an acknowledge signal on SDA.

4. The master sends a register address.

5. The AMC7812B asserts an acknowledge signal on SDA.

6. The master device asserts a restart condition.

7. The master then sends the 7-bit AMC7812B slave address followed by a '1' for the direction bit, indicating a

read operation.

8. The AMC7812B asserts an acknowledge signal on SDA.

9. The AMC7812B then sends the high byte of the register (D[15:8]).

10. The master asserts an acknowledge signal on SDA.

11. The AMC7812B sends the low byte of the register (D[7:0]).

12. The master asserts a not acknowledge signal on SDA.

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

Figure 102. Read a Single Word

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AMC7812BSPAP Datasheet(PDF) 53 Page - Texas Instruments