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Chapter 6 Clock Description
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
117
Table 6-9. CR field descriptions
Field
Description
IDF
The value of this field sets the FMPLL input division factor as described in
ODF
The value of this field sets the FMPLL output division factor as described in
NDIV
The value of this field sets the FMPLL loop division factor as described in
EN_PLL_SW
This bit is used to enable progressive clock switching. After the PLL locks, the PLL output initially
is divided by 8, and then progressively decreases until it reaches divide-by-1.
0 Progressive clock switching disabled.
1 Progressive clock switching enabled.
Note:
Progressive clock switching should not be used if a non-changing clock is needed, such
as for serial communications, until the division has finished.
UNLOCK_ONCE
This bit is a sticking indication of FMPLL loss of lock condition. UNLOCK_ONCE is set when the
FMPLL loses lock. Whenever the FMPLL reacquires lock, UNLOCK_ONCE remains set. Only a
power-on reset clears this bit.
I_LOCK
This bit is set by hardware whenever there is a lock/unlock event.
S_LOCK
This bit is an indication of whether the FMPLL has acquired lock.
0: FMPLL unlocked
1: FMPLL locked
Note:
PLL_FAIL_MASK This bit is used to mask the pll_fail output.
0 pll_fail not masked.
1 pll_fail masked.
PLL_FAIL_FLAG
This bit is asynchronously set by hardware whenever a loss of lock event occurs while FMPLL
is switched on. It is cleared by software writing 1.
Table 6-10. Input divide ratios
IDF[3:0]
Input divide ratios
0000
Divide by 1
0001
Divide by 2
0010
Divide by 3
0011
Divide by 4
0100
Divide by 5
0101
Divide by 6
0110
Divide by 7
0111
Divide by 8
1000
Divide by 9
1001
Divide by 10
1010
Divide by 11
1011
Divide by 12
1100
Divide by 13
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