I2C Registers
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21.4.1.27 I2C_OA1 Register (offset = C4h) [reset = 0h]
I2C_OA1 is shown in Figure 21-42 and described in Table 21-35.
CAUTION: During an active transfer phase (between STT has been set to 1 and receiving of ARDY), no
modification must be done in this register. Changing it may result in an unpredictable behavior. This
register is used to specify the first alternative I2C 7-bit or 10-bit address (own address 1 - OA1).
Figure 21-42. I2C_OA1 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 OA1
R-0h R/W-0h
7 6 5 4 3 2 1 0
OA1
R/W-0h
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 21-35. I2C_OA1 Register Field Descriptions
Bit Field Type Reset Description
31-10 Reserved R 0h
9-0 OA1 R/W 0h Own address 1.
This field specifies either: A
10-bit address coded on OA1
[9:0] when XOA1 (Expand Own Address
1 - XOA1, I2C_CON[6]) is set to 1.
A
7-bit address coded on OA1
[6:0] when XOA1 (Expand Own Address 1 XOA1, I2C_CON[6]) is
cleared to 0.
In this case, OA1
[9:7] bits must be cleared to 000 by application software.
Value after reset is low (all 10 bits).
3762
I2C SPRUH73H–October 2011–Revised April 2013
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