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Chapter 22 Inter-Integrated Circuit Bus Controller Module (I
2
C)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
409
Reading the IBDR will return the last byte received while the I
2
C is configured in either master receive or
slave receive modes. The IBDR does not reflect every byte that is transmitted on the I
2
C bus, nor can
software verify that a byte has been written to the IBDR correctly by reading it back.
In master transmit mode, the first byte of data written to IBDR following assertion of MS/SL is used for
the address transfer and should comprise the calling address (in position D7–D1) concatenated with the
required R/W bit (in position D0).
22.3.7
I
2
C Bus Interrupt Configuration Register (IBIC)
22.4
DMA Interface
A simple DMA interface is implemented so that the I
2
C can request data transfers with minimal support
from the CPU. DMA mode is enabled by setting bit 1 in the Control Register.
The DMA interface is only valid when the I
2
C module is configured for Master Mode.
Offset 0x5
Access: Read/write any time
7
6
5
4
3
2
1
0
R
BIIE
1
1
This bit cannot be set in reset state, when I2C is in slave mode. It can be set to 1 only when I2C is in Master mode.
This information is missing from the spec.
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
Figure 22-9. I
2
C Bus Interrupt Configuration Register (IBIC)
Table 22-10. IBIC field descriptions
Field
Description
BIIE
Bus Idle Interrupt Enable bit. This configuration bit can be used to enable the generation of an interrupt
once the I
2
C bus becomes idle. Once this bit is set, an IBB high-low transition will set the IBIF bit. This
feature can be used to signal to the CPU the completion of a STOP on the I
2
C bus.
1 Bus Idle Interrupts enabled
0 Bus Idle Interrupts disabled
Note:
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