I2C Registers
21.4.1.30 I2C_ACTOA Register (offset = D0h) [reset = 0h]
I2C_ACTOA is shown in
and described in
This read-only register is used to indicate which one of the module s four own addresses the external
master used when addressing the module. The CPU can read this register when the AAS indication was
activated. The indication is cleared at the end of the transfer.
Figure 21-45. I2C_ACTOA Register
31
30
29
28
27
26
25
24
Reserved
R-0h
23
22
21
20
19
18
17
16
Reserved
R-0h
15
14
13
12
11
10
9
8
Reserved
R-0h
7
6
5
4
3
2
1
0
Reserved
OA3_ACT
OA2_ACT
OA1_ACT
OA0_ACT
R-0h
R-0h
R-0h
R-0h
R-0h
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 21-38. I2C_ACTOA Register Field Descriptions
Bit
Field
Type
Reset
Description
31-4
Reserved
R
0h
3
OA3_ACT
R
0h
Own address 3 active.
When a bit location is set to 1 by the core, it signalizes to the Local
Host that an external master using the corresponding own address
addressed the module.
Value after reset is low.
0x0 = Own address inactive
0x1 = Own address active
2
OA2_ACT
R
0h
Own address 2 active.
When a bit location is set to 1 by the core, it signalizes to the Local
Host that an external master using the corresponding own address
addressed the module.
Value after reset is low.
0x0 = Own address inactive
0x1 = Own address active
1
OA1_ACT
R
0h
Own address 1 active.
When a bit location is set to 1 by the core, it signalizes to the Local
Host that an external master using the corresponding own address
addressed the module.
Value after reset is low.
0x0 = Own address inactive
0x1 = Own address active
0
OA0_ACT
R
0h
Own address 0 active.
When a bit location is set to 1 by the core, it signalizes to the Local
Host that an external master using the corresponding own address
addressed the module.
Value after reset is low.
0x0 = Own address inactive
0x1 = Own address active
3765
SPRUH73H – October 2011 – Revised April 2013
I2C
Copyright © 2011–2013, Texas Instruments Incorporated