NXP Semiconductors MC9S12VRP64, Owner Reference Manual

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CPMU Electrical Specifications (VREG, OSC, IRC, PLL)
MC9S12VRP Family Reference Manual Rev. 1.3
NXP Semiconductors 505
B.3 OSC Electrical Specifications
B.4 IRC Electrical Specifications
Table B-4. IRC electrical characteristics
B.5 Phase Locked Loop
B.5.1 Jitter Information
With each transition of the feedback clock, the deviation from the reference clock is measured and the
input voltage to the VCO is adjusted accordingly.The adjustment is done continuously with no abrupt
changes in the VCOCLK frequency. Noise, voltage, temperature and other factors cause slight variations
in the control loop resulting in a clock jitter. This jitter affects the real minimum and maximum clock
periods as illustrated in
Figure B-1 .
Table B-3. OSC Electrical Characteristics
Conditions are shown in Table A-7 unless otherwise noted
Num Rating Symbol Min Typ Max Unit
1 Nominal crystal or resonator frequency f
OSC
4.0
—
20 MHz
2 Startup Current i
OSC
100
— —

A
3a Oscillator start-up time (4MHz)
1
1
These values apply for carefully designed PCB layouts with capacitors that match the crystal/resonator
requirements.
t
UPOSC
—
2 10 ms
3b Oscillator start-up time (8MHz)
1
t
UPOSC
—
1.6 8 ms
3c Oscillator start-up time (16MHz)
1
t
UPOSC
—
1 5 ms
4 Clock Monitor Failure Assert Frequency f
CMFA
200 450 1200 kHz
5 Input Capacitance (EXTAL, XTAL pins) C
IN
—
7
—
pF
6 EXTAL Pin Input Hysteresis
V
HYS,EXT
AL
—
120
—
mV
7
EXTAL Pin oscillation amplitude (loop
controlled Pierce)
V
PP,EXTAL
—
0.9
—
V
8 EXTAL Pin oscillation required amplitude
2
2
Needs to be measured at room temperature on the application board using a probe with very low (<=5pF) input
capacitance.
V
PP,EXTAL
0.8 — 1.5
V
Num Rating Symbol Min Typ Max Unit
1 Junction Temperature - 40° to 150° Celsius
Internal Reference Frequency, factory trimmed f
IRC1M_TRIM
0.9895 1.002 1.0145 MHz