PXD10RM Datasheet, PDF (222/1332 Pages) Freescale Semiconductor, Inc – PXD10 Microcontroller

FRC = (FOSC * MD) / n,
Eqn. 8-2
Where n is the value in CMU_FDR register and MD is the value in CMU_MDR.
Frequency Meter by default evaluates CK_FIRC, but the software can swap to CK_SIRC or CK_SXOSC
by programming the CKSEL bits in CMU_CSR register.The CKON bits indicate which is the actual clock
at the output of the multiplexer MUX1
8.10.5 Memory Map and Register Description
The memory map of the CMU is shown in the following table.
Table 8-31. RC Digital Interface Register Set - Base address 0xC3FE_0100
Register Name
Control Status Register (CMU_CSR)
Frequency Display Register (CMU_FDR)
High Frequency Reference Register FMPLL0(CMU_HFREFR_A)
Low Frequency Reference Register FMPLL0(CMU_LFREFR_A)
Interrupt Status Register (CMU_ISR)
reserved
Measurement Duration Register (CMU_MDR)
Address Offset Location
0x00
0x04
0x08
0x0C
0x10
0x14
0x18
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8.10.5.1 Control Status Register (CMU_CSR)
Address offset: 0x00
Reset value: 0x00000006
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
reserved
SFM
reserved
r
rs
r
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
reserved
CKSEL1
reserved
RCDIV
CME_
A
r
rw
r
Table 8-32. Control Status Register (CMU_CSR)
rw
rw
8-44
PXD10 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor