SAF-XE167F-48F66L INFINEON [Infineon Technologies AG], SAF-XE167F-48F66L Datasheet - Page 97

• Manufacturer Part Number: SAF-XE167F-48F66L
• Description: 16-Bit Single-Chip Real Time Signal Controller
• Manufacturer: INFINEON [Infineon Technologies AG]

Direct Drive
When direct drive operation is selected (SYSCON0.CLKSEL = 11
derived directly from the input clock signal CLKIN1:
f
The frequency of
times of
Selecting Bypass Operation from the XTAL1
in a similar configuration.
Prescaler Operation
When prescaler operation is selected (SYSCON0.CLKSEL = 10
1
XTAL1) or from the internal clock source through the output prescaler K1 (= K1DIV+1):
f
If a divider factor of 1 is selected, the frequency of
this case the high and low times of
clock
The lowest system clock frequency results from selecting the maximum value for the
divider factor K1:
f
Phase Locked Loop (PLL)
When PLL operation is selected (SYSCON0.CLKSEL = 10
the on-chip phase locked loop is enabled and provides the system clock. The PLL
multiplies the input frequency by the factor F (
F is calculated from the input divider P (= PDIV+1), the multiplication factor N (=
NDIV+1), and the output divider K2 (= K2DIV+1):
(F = N / (P × K2)).
The input clock can be derived either from an external source at XTAL1 or from the on-
chip clock source.
The PLL circuit synchronizes the system clock to the input clock. This synchronization is
performed smoothly so that the system clock frequency does not change abruptly.
Adjustment to the input clock continuously changes the frequency of
locked to
of individual TCSs.
1) Voltages on XTAL1 must comply to the core supply voltage
Data Sheet
SYS
SYS
SYS
B
), the system clock is derived either from the crystal oscillator (input clock signal
=
=
=
f
f
f
f
OSC
IN
OSC
OSC
f
.
SYS
f
(external or internal).
IN
/ K1.
/ 1024.
. The slight variation causes a jitter of
are determined by the duty cycle of the input clock
f
SYS
is the same as the frequency of
f
SYS
are determined by the duty cycle of the input
95
1)
input and using a divider factor of 1 results
f
SYS
V
f
=
DDI1
SYS
f
SYS
f
IN
.
which in turn affects the duration
f
× F).
IN
equals the frequency of
XE166 Family Derivatives
. In this case the high and low
B
, PLLCON0.VCOBY = 0
f
B
Electrical Parameters
IN
, PLLCON0.VCOBY =
B
.
), the system clock is
f
SYS
V2.1, 2008-08
so that it is
XE167x
f
OSC
. In
B
),