XC886/888CLM
Power Supply, Reset and Clock Management
User’s Manual
7-14
V1.3, 2010-02
Power, Reset and Clock, V 1.0
PLL Base Mode
When the oscillator is disconnected from the PLL, the system clock is derived from the
VCO base (free running) frequency clock (shown in
) divided by the K factor.
(7.1)
Prescaler Mode (VCO Bypass Operation)
In VCO bypass operation, the system clock is derived from the oscillator clock, divided
by the P and K factors.
(7.2)
PLL Mode
The system clock is derived from the oscillator clock, divided by the P factor, multiplied
by the N factor, and divided by the K factor.
(7.3)
shows the settings of bits OSCDISC and VCOBYP for different clock mode
selection.
Note: When oscillator clock is disconnected from PLL (OSCDISC bit = 1) or not
available (OSCR bit = 0), the clock mode is PLL Base mode regardless of the
setting of VCOBYP bit.
In normal running mode, the system works in the PLL mode.
Table 7-4
Clock Mode Selection
OSCDISC
VCOBYP
Clock Working Modes
0
0
PLL Mode
0
1
Prescaler Mode
1
0
PLL Base Mode
1
1
PLL Base Mode
K
1
x
f
f
VCObase
SYS
=
K
x
P
1
x
f
f
OSC
SYS
=
K
x
P
N
x
f
f
OSC
SYS
=
*
Содержание XC886CLM
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