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Chapter 22 Inter-Integrated Circuit Bus Controller Module (I
2
C)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
399
All registers are accessible via 8-, 16-, or 32-bit accesses. However, 16-bit accesses must be aligned to
16-bit boundaries, and 32-bit accesses must be aligned to 32-bit boundaries. As an example, the IBDF
register for the frequency divider is accessible by a 16-bit read/write to address Base + 0x000, but
performing a 16-bit access to Base + 0x001 is illegal.
22.3.2
I
2
C Bus Address Register (IBAD)
This register contains the address the I
2
C bus will respond to when addressed as a slave; note that it is not
the address sent on the bus during the address transfer.
Table 22-1. I2C memory map
Base address: 0xFFE3_0000
Address offset
Register
Location
0x0
I
2
C Bus Address Register (IBAD)
0x1
I
2
C Bus Frequency Divider Register (IBFD)
0x2
I
2
C Bus Control Register (IBCR)
0x3
I
2
C Bus Status Register (IBSR)
0x4
I
2
C Bus Data I/O Register (IBDR)
0x5
I
2
C Bus Interrupt Config Register (IBIC)
Offset 0x0
Access: Read/write any time
7
6
5
4
3
2
1
0
R
ADR
0
W
Reset
0
0
0
0
0
0
0
0
Figure 22-2. I
2
C Bus Address Register (IBAD)
Table 22-2. IBAD field descriptions
Field
Description
ADR
Slave Address. Specific slave address to be used by the I
2
C Bus module.
Note:
The default mode of I
2
C Bus is slave mode for an address match on the bus.
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