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Chapter 22 Inter-Integrated Circuit Bus Controller Module (I
2
C)
MPC5606BK Microcontroller Reference Manual, Rev. 2
400
Freescale Semiconductor
22.3.3
I
2
C Bus Frequency Divider Register (IBFD)
Offset 0x1
Access: Read/write any time
7
6
5
4
3
2
1
0
R
IBC
W
Reset
0
0
0
0
0
0
0
0
Figure 22-3. I
2
C Bus Frequency Divider Register (IBFD)
Table 22-3. IBFD field descriptions
Field
Description
IBC
I-Bus Clock Rate. This field is used to prescale the clock for bit rate selection. The bit clock generator is
implemented as a prescale divider. The IBC bits are decoded to give the Tap and Prescale values as
follows:
7–6 select the prescaled shift register (see
)
5–3 select the prescaler divider (see
)
2–0 select the shift register tap point (see
)
Table 22-4. I-Bus multiplier factor
IBC7
–
6
MUL
00
01
01
02
10
04
11
RESERVED
Table 22-5. I-Bus prescaler divider values
IBC5
–
3
scl2start
(clocks)
scl2stop
(clocks)
scl2tap
(clocks)
tap2tap
(clocks)
000
2
7
4
1
001
2
7
4
2
010
2
9
6
4
011
6
9
6
8
100
14
17
14
16
101
30
33
30
32
110
62
65
62
64
111
126
129
126
128
Содержание MPC5605BK
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