sak-c868p-1rr Infineon Technologies Corporation, sak-c868p-1rr Datasheet - Page 171
sak-c868p-1rr
Manufacturer Part Number
sak-c868p-1rr
Description
8 - Bit Cmos Microcontroller
Manufacturer
Infineon Technologies Corporation
Datasheet
1.SAK-C868P-1RR.pdf
(266 pages)
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5.4
The top-level view of the system clock generation of the C868 is shown in
Figure 5-3
5.5
The PLL consists of a voltage controlled oscillator (VCO) with a feedback path. A divider
in the feedback path divides the VCO frequency down. The resulting frequency is then
compared to the externally applied frequency. The phase detection logic determines the
difference between the two clock signals and accordingly controls the frequency of the
VCO. During start-up, the VCO increases its frequency until the divided feedback clock
matches the external clock frequency. A lock detection logic monitors and signals this
condition. The phase detection logic continues to monitor the two clock signals and
adjusts the VCO clock if required.
The PLL provides mechanisms to detect a failure of the external clock and to bring the
C868 into a safe state in such a case. When the PLL loses the lock to the external clock,
either due to a break of the crystal or an external line, it generate an internal reset. The
PLLR flag in the SCUWDT register is set, this flag can only be reset by a hardware reset
or by software.
Due to this operation, the VCO clock of the PLL has a frequency which is a multiple of
the externally applied clock. The factor for this is controlled through the value applied to
the divider in the feedback path. That is why this factor is often called a multiplier,
although it actually controls a divider. This parameter called the feedback divider has a
fixed value N = 15.
When software power down mode is entered, the PLL is powered down.
User’s Manual
XTAL1
XTAL2
On-Chip
Clock Generation
PLL Operation
Osc
Block Diagram of the Clock Generation
f
OSC
clkin
PLL
clkout
Reset, Brownout and System Clock Operation
f
PLL
5-5
SDD
MUX
system
clock (
f
V 1.0, 2003-01
SYS
Figure
)
C868
5-3.
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