MC9S12NE64_06 Datasheet, PDF (518/554 Pages) Freescale Semiconductor, Inc – Microcontrollers

Appendix A Electrical Characteristics
Table A-12. Oscillator Characteristics
Conditions are shown in Table A-4 unless otherwise noted
Num C
Rating
Symbol Min
1 C _{Crystal oscillator range (Pierce)} ^{1, 2}
f_OSC
0.5
2 P Startup current
3 C Oscillator start-up time (Pierce)
4 D Clock quality check time-out
5 P Clock monitor failure assert frequency
6 P _{External square wave input frequency} ²
i_OSC
t_UPOSC
t_CQOUT
f_CMFA
f_EXT
100
0.45
50
0.5
7 D External square wave pulse width low
8 D External square wave pulse width high
9 D External square wave rise time
10 D External square wave fall time
11 D Input capacitance (EXTAL, XTAL pins)
12 C DC operating bias in Colpitts configuration on
EXTAL pin
t_EXTL
9.5
t_EXTH
9.5
t_EXTR
t_EXTF
C_IN
V_DCBIAS
EXTAL pin input high voltage⁴
V _IH,EXTAL 0.7*V_DDPLL
EXTAL pin input high voltage⁴
V _IH,EXTAL
EXTAL pin input low voltage⁴
V _IL,EXTAL
EXTAL pin input low voltage⁴
V _IL,EXTAL
V_SSPLL–
0.3
EXTAL pin input hysteresis⁴
V_HYS,EXTAL
1 _{Depending on the crystal a damping series resistor might be necessary}
2 _{XCLKS =0 during reset}
3 _{fosc = 25 MHz, C = 22 pF.}
4 _{Maximum value is for extreme cases using high Q, low frequency crystals}
Typ
8³
100
7
1.1
250
Max
40
100 ⁴
2.5
200
50
1
1
Unit
MHz
µA
ms
s
kHz
MHz
ns
ns
ns
ns
pF
V
V
V_DDPLL+ 0.3 V
0.3*V_DDPLL
V
V
mV
A.12.3 Phase-Locked Loop
The oscillator provides the reference clock for the PLL. The PLL´s voltage controlled oscillator (VCO) is
also the system clock source in self clock mode.
A.12.3.1 XFC Component Selection
This section describes the selection of the XFC components to achieve a good filter characteristics.
MC9S12NE64 Data Sheet, Rev. 1.1
518
Freescale Semiconductor