PXS20RM Datasheet, PDF (240/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Clock Monitor Unit (CMU)
12.3.3 High-frequency reference register A (CMU_HFREFR_A)
Address: Base + 0x08
Access: User read/write
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R0 0 0 0 0 0 0 0 0 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
R0 0 0 0
W
HFREF_A
Reset 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1
Figure 12-3. High-frequency reference register A (CMU_HFREFR_A)
Table 12-6. CMU_HFREFR_A field descriptions
Field
Description
HFREF_A High-frequency reference value
These bits determine the high reference value for the FMPLL clock. The reference value is given by:
(HFREF_A16) × (F_{IRCOSC_CLK}4).
12.3.4 Low-frequency reference register A (CMU_LFREFR_A)
Address: Base + 0x0C
Access: User read/write
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R0 0 0 0 0 0 0 0 0 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
R0 0 0 0
W
LFREF_A
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Figure 12-4. Low-frequency reference register A (CMU_LFREFR_A)
Table 12-7. CMU_LFREFR_A fields descriptions
Field
Description
LFREF_A Low-frequency reference value
These bits determine the low reference value for the FMPLL clock. The reference value is given by:
(LFREF_A16) × (F_{IRCOSC_CLK}4).
12-4
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor