Freescale Semiconductor MPC5604B - Frequency Display Register (CMU_FDR); High Frequency Reference Register FMPLL (CMU_HFREFR)

MPC5604B/C Microcontroller Reference Manual, Rev. 8
116 Freescale Semiconductor
6.8.5.2 Frequency Display Register (CMU_FDR)
.
6.8.5.3 High Frequency Reference Register FMPLL (CMU_HFREFR)
Offset: 0x04 Access: Read-only
0123456789101112131415
R00000000 0 0 0 0 FD[19:16]
W
Reset0000000000000000
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R FD[15:0]
W
Reset0000000000000000
Figure 6-13. Frequency Display Register (CMU_FDR)
Table 6-18. CMU_FDR field descriptions
Field Description
FD Measured frequency bits.
This register displays the measured frequency f
x
with respect to f
FXOSC
. The measured value is given
by the following formula: f
x
= (f
FXOSC
× MD) / n, where n is the value in CMU_FDR register.
Note: x = FIRC, SIRC or SXOSC.
Offset: 0x08 Access: Read/write
0123456789101112131415
R00000000 00000 000
W
Reset0000000000000000
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R0000
HFREF
W
Reset0000111111111111
Figure 6-14. High Frequency Reference Register FMPLL (CMU_HFREFR)
Table 6-19. CMU_HFREFR field descriptions
Field Description
HFREF High Frequency reference value.
This field determines the high reference value for the FMPLL clock. The reference value is given by:
(HFREF  16) × (f
FIRC
 4).