Clocks and Power Control
MPC561/MPC563 Reference Manual, Rev. 1.2
8-34
Freescale Semiconductor
MSB
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Field
MF
— LOCS LOCSS SPLS
PORESET
0000_0000_0000 or 0000_0000_1000
0000
HRESET
Unaffected
Addr
0x2F C284
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
LSB
31
Field SPLSS TEXPS TEXP_INV TMIST — CSRC LPM CSR LOLRE —
DIVF
PORESET
0
1
00_0000_0000_0000
HRESET
U
1
U
0
U
000
Unaffected
—
Unaffected
Figure 8-17. PLL, Low-Power, and Reset-Control Register (PLPRCR)
Table 8-11. PLPRCR Bit Descriptions
Bits
Name
Description
0:11
MF
Multiplication factor bits. The output of the VCO is divided to generate the feedback signal to
the phase comparator. The MF bits control the value of the divider in the SPLL feedback loop.
The phase comparator determines the phase shift between the feedback signal and the
reference clock. This difference results in either an increase or decrease in the VCO output
frequency.
The MF bits can be read and written at any time. However, this field can be write-protected
by setting the MF and pre-divider lock (MFPDL) bit in the SCCR. Changing the MF bits
causes the SPLL to lose lock. Also, the MF field should not be modified when entering or
exiting from low power mode (LPM change), or when back-up clock is active.
The normal reset value for the DFNH bits is zero (divide by 1). When the PLL is operating in
one-to-one mode, the multiplication factor is set to x1 (MF = 0).
12
—
Reserved
13
LOCS
Loss of clock status. When the oscillator or external clock source is not at the minimum
frequency, the loss-of-clock circuit asserts the LOCS bit. This bit is cleared when the
oscillator or external clock source is functioning normally. This bit is reset only on power-on
reset. Writes to this bit have no effect.
0 No loss of oscillator is currently detected
1 Loss of oscillator is currently detected
14
LOCSS
Loss of clock sticky. If, after negation of PORESET, the loss-of-clock circuit detects that the
oscillator or external clock source is not at a minimum frequency, the LOCSS bit is set.
LOCSS remains set until software clears it by writing a one to it. A write of zero has no effect
on this bit. The reset value is determined during hard reset. The STBUC bit will be set
provided the PLL lock condition is not met when HRESET is asserted, and cleared if the PLL
is locked when HRESET is asserted.
0 No loss of oscillator has been detected
1 Loss of oscillator has been detected
15
SPLS
System PLL lock status bit
0 SPLL is currently not locked
1 SPLL is currently locked
Summary of Contents for MPC561
Page 84: ...MPC561 MPC563 Reference Manual Rev 1 2 lxxxiv Freescale Semiconductor...
Page 144: ...Signal Descriptions MPC561 MPC563 Reference Manual Rev 1 2 2 46 Freescale Semiconductor...
Page 206: ...Central Processing Unit MPC561 MPC563 Reference Manual Rev 1 2 3 62 Freescale Semiconductor...
Page 302: ...Reset MPC561 MPC563 Reference Manual Rev 1 2 7 14 Freescale Semiconductor...
Page 854: ...Time Processor Unit 3 MPC561 MPC563 Reference Manual Rev 1 2 19 24 Freescale Semiconductor...
Page 968: ...Development Support MPC561 MPC563 Reference Manual Rev 1 2 23 54 Freescale Semiconductor...
Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
Page 1212: ...TPU3 ROM Functions MPC561 MPC563 Reference Manual Rev 1 2 D 60 Freescale Semiconductor...
Page 1216: ...Memory Access Timing MPC561 MPC563 Reference Manual Rev 1 2 E 4 Freescale Semiconductor...