Datasheet

S
Device
Slave Address
0
A
Register Pointer
(Register Address)
A
Sr
Device
Slave Address
1
From Master to Slave
A = Acknowledge
N = Not Acknowledge
S = START Condition
P = Stop Condition
Sr = Repeated START Condition
From Slave to Master
A
From High Byte of
Device Register
A
From Low Byte of
Device Register
N
P
AMC7812
www.ti.com SBAS513E –JANUARY 2011–REVISED SEPTEMBER 2013
Reading a Single Word from Any Register (Figure 102)
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 a register address.
5. The AMC7812 asserts an acknowledge signal on SDA.
6. The master device asserts a restart condition.
7. The master then sends the 7-bit AMC7812 slave address followed by a '1' for the direction bit, indicating a
read operation.
8. The AMC7812 asserts an acknowledge signal on SDA.
9. The AMC7812 then sends the high byte of the register (D15:D8).
10. The master asserts an acknowledge signal on SDA.
11. The AMC7812 sends the low byte of the register (D7:D0).
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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