29-8
MC9328MX1 Reference Manual
MOTOROLA
I
2
C Module
29.6.2 I
2
C Frequency Divider Register
The I
2
C Frequency Divider Register (IFDR) holds the prescaler value that configures the clock for bit-rate
selection.
IFDR
I
2
C Frequency Divider Register
Addr
0x00217004
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
IC
TYPE
r
r
r
r
r
r
r
r
r
r
rw
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
Table 29-4. IFDR Register Description
Name
Description
Settings
Reserved
Bits 31
–
6
Reserved—These bits are reserved and should read 0.
IC
Bits 5
–
0
I
2
C
Clock Rate Divider
—Prescales the clock for bit-rate selection. Due
to potentially slow rise and fall times of SCL and SDA, bus signals are
sampled at the prescaler frequency. The input clock from the PLL is
HCLK. The serial bit clock for the I
2
C module is HCLK divided by the
divider shown in Table 29-5.
Note:
The IC value can be changed at any point.
See Table 29-5 on
page 29-9.
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