sak-xc888clm-8ffa Infineon Technologies Corporation, sak-xc888clm-8ffa Datasheet - Page 69

• Manufacturer Part Number: sak-xc888clm-8ffa
• Description: High Performance 8-bit Microcontroller With On-chip Flash Memory And Can
• Manufacturer: Infineon Technologies Corporation

Figure 25
Direct Drive (PLL Bypass Operation)
During PLL bypass operation, the system clock has the same frequency as the external
clock source. For the XC886/888, the PLL bypass cannot be set active. Hence, the direct
drive mode is not available for use.
PLL Base Mode
The system clock is derived from the VCO base frequency clock divided by the K factor.
Both VCO bypass and PLL bypass must be inactive for this PLL mode.
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.
Data Sheet
Prelimary
OSC
fosc
CGU Block Diagram
P:1
OSCDISC
fn
fp
f
SYS
f
SYS
osc fail
detect
detect
f
NDIV
core
PLL
lock
N:1
SYS
=
=
f
VCObase
f
=
OSC
65
fvco
f
OSC
×
-------------
P K
×
VCOBYP
×
1
--- -
K
1
K:1
Functional Description
PLLBYP
XC886/888CLM
fsys
V0.1, 2006-02
OSCR
LOCK