mpc5554mzp80r2 Freescale Semiconductor, Inc, mpc5554mzp80r2 Datasheet - Page 21

• Manufacturer Part Number: mpc5554mzp80r2
• Description: Mpc5554 High Performance Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

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Freescale Semiconductor
Spec
Nominal crystal and external reference values are worst-case not more than 1%. The device operates correctly if the frequency
remains within ± 5% of the specification limit. This tolerance range allows for a slight frequency drift of the crystals over time.
The designer must thoroughly understand the drift margin of the source clock.
All internal registers retain data at 0 Hz.
Up to the maximum frequency rating of the device (refer to
Loss of reference frequency is defined as the reference frequency detected internally, which transitions the PLL into self-clocked
mode.
The PLL operates at self-clocked mode (SCM) frequency when the reference frequency falls below f
measured on the CLKOUT ball with the divider set to divide-by-two of the system clock.
NOTE: In SCM, the MFD and PREDIV have no effect and the RFD is bypassed.
Use the EXTAL input high voltage parameter when using the FlexCAN oscillator in crystal mode (no quartz crystals or
resonators). (V
Use the EXTAL input low voltage parameter when using the FlexCAN oscillator in crystal mode (no quartz crystals or
resonators). (V
I
C
This specification applies to the period required for the PLL to relock after changing the MFD frequency control bits in the
synthesizer control register (SYNCR). From power up with crystal oscillator reference, the lock time also includes the crystal
startup time.
PLL is operating in 1:1 PLL mode.
V
Jitter is the average deviation from the programmed frequency measured over the specified interval at maximum f
Measurements are made with the device powered by filtered supplies and clocked by a stable external clock signal. Noise
injected into the PLL circuitry via V
for a given interval. CLKOUT divider is set to divide-by-two.
Values are with frequency modulation disabled. If frequency modulation is enabled, jitter is the sum of (jitter + Cmod).
Modulation depth selected must not result in f
f
Maximum value for dual controller (1:1) mode is (f
xtal
sys
19
20
21
22
DDE
PCB_EXTAL
is the oscillator bias current out of the XTAL pin with both EXTAL and XTAL pins grounded.
=
= 3.0–3.6 V.
f
CLKOUT period jitter,
maximum:
Frequency modulation range limit
ICO frequency
f
f
Predivider output frequency (to PLL)
ico
ico
ico
(do not exceed f
Peak-to-peak jitter (clock edge to clock edge)
Long term jitter (averaged over a 2 ms interval)
÷ (2
= [ f
= [ f
and C
RFD
ref_crystal
ref_ext
extal
xtal
)
– V
PCB_XTAL
– V
× (MFD + 4) ] ÷ (PREDIV + 1)
extal
xtal
× (MFD + 4) ] ÷ (PREDIV + 1)
sys
) must be ≥ 400 mV for the oscillator’s comparator to produce the output clock.
) must be ≥ 400 mV for the oscillator’s comparator to produce the output clock.
Characteristic
maximum)
are the measured PCB stray capacitances on EXTAL and XTAL, respectively.
13, 14
Table 12. FMPLL Electrical Specifications (continued)
(V
DDSYN
measured at f
DDSYN
MPC5554 Microcontroller Data Sheet, Rev. 2.0
= 3.0–3.6 V; V
15
and V
sys
SSSYN
SYS
value greater than the f
MAX
16
and variation in crystal oscillator frequency increase the jitter percentage
÷ 2) with the predivider set to 1 (FMPLL_SYNCR[PREDIV] = 0b001).
SS
= V
Table
SSSYN
Symbol
C
f
PREDIV
C
JITTER
1).
f
MOD
ico
= 0.0 V; T
sys
maximum specified value.
A
Minimum
= T
0.8
48
—
—
4
L
to T
H
)
Electrical Characteristics
Maximum
LOR
0.01
f
20
2.4
MAX
5.0
. SCM frequency is
17
sys
.
f
CLKOUT
%f
MHz
MHz
Unit
%
SYS
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