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Chapter 6 Clock Description
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
127
6.8.5.1
Control Status Register (CMU_CSR)
Reserved
0x14
0x00000000
—
Measurement Duration Register (CMU_MDR)
0x18
0x00000000
Offset: 0x00
Access: Read/write
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
0
0
0
0
0
0
0
0
SFM
1
1
You can read this field, and you can write a value of “1” to it. Writing a “0” has no effect. A reset will also clear this bit.
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
0
0
0
0
0
0
CKSEL1
0
0
0
0
0
RCDIV
CME_A
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
Figure 6-12. Control Status Register (CMU_CSR)
Table 6-17. CMU_CSR field descriptions
Field
Description
SFM
Start frequency measure.
The software can only set this bit to start a clock frequency measure. It is reset by hardware when
the measure is ready in the CMU_FDR register.
0 Frequency measurement completed or not yet started.
1 Frequency measurement not completed.
CKSEL1
Clock oscillator selection bit.
CKSEL1 selects the clock to be measured by the frequency meter.
00 FIRC_clk selected.
01 SIRC_clk selected.
10 SXOSC_clk selected.
11 FIRC_clk selected.
RCDIV
RC clock division factor.
These bits specify the RC clock division factor. The output clock is FIRC_clk divided by the factor
2
RCDIV
. This output clock is used to compare with FXOSC_clk for crystal clock monitor feature.The
clock division coding is as follows.
00 Clock divided by 1 (No division)
01 Clock divided by 2
10 Clock divided by 4
11 Clock divided by 8
CME_A
FMPLL_0 clock monitor enable.
0 FMPLL_0 monitor disabled.
1 FMPLL_0 monitor enabled.
Table 6-16. CMU memory map (continued)
Base address: 0xC3FE_0100
Register name
Address offset
Reset value
Location
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