S912XEG128J2MAA Datasheet, PDF (1238/1324 Pages) Freescale Semiconductor, Inc – Microcontrollers

Appendix A Electrical Characteristics
A.6.2 Oscillator
Table A-24. Oscillator Characteristics
Conditions are shown in Table A-4. unless otherwise noted
Num C
Rating
1a C Crystal oscillator range (loop controlled Pierce)
1b C _{Crystal oscillator range (full swing Pierce)} ^(1),(2)
2 P Startup Current
3a C _{Oscillator start-up time (LCP, 4MHz)}⁽³⁾
3b C _{Oscillator start-up time (LCP, 8MHz)}³
3c C _{Oscillator start-up time (LCP, 16MHz)}³
4a C _{Oscillator start-up time (full swing Pierce, 2MHz)}³
4b C _{Oscillator start-up time (full swing Pierce, 4MHz)}³
4c C _{Oscillator start-up time (full swing Pierce, 8MHz)}³
4d C _{Oscillator start-up time (full swing Pierce, 16MHz)}³
4e C _{Oscillator start-up time (full swing Pierce, 40MHz)}³
5 D Clock Quality check time-out
6 P Clock Monitor Failure Assert Frequency
7 P External square wave input frequency
8 D External square wave pulse width low
9 D External square wave pulse width high
10 D External square wave rise time
11 D External square wave fall time
12 D Input Capacitance (EXTAL, XTAL pins)
13 P EXTAL Pin Input High Voltage
T _{EXTAL Pin Input High Voltage}^,(4)
14 P EXTAL Pin Input Low Voltage
T ^{EXTAL Pin Input Low Voltage,4}
Symbol
f_OSC
f_OSC
i_OSC
t_UPOSC
t_UPOSC
t_UPOSC
t_UPOSC
t_UPOSC
t_UPOSC
t_UPOSC
t_UPOSC
t_CQOUT
f_CMFA
f_EXT
t_EXTL
t_EXTH
t_EXTR
t_EXTF
C_IN
V_IH,EXTAL
V_IH,EXTAL
V_IL,EXTAL
V_IL,EXTAL
Min
4.0
2.0
100
—
—
—
—
—
—
—
—
0.45
200
2.0
9.5
9.5
—
—
—
0.75*V_DDPLL
—
—
V_SSPLL - 0.3
Typ
—
—
—
2
1.6
1
8
4
2
1
0.8
—
400
—
—
—
—
—
7
—
—
—
—
Max Unit
16
MHz
40
MHz
—
µA
10
ms
8
ms
5
ms
40
ms
20
ms
10
ms
5
ms
4
ms
2.5
s
1000
KHz
50
MHz
—
ns
—
ns
1
ns
1
ns
—
pF
—
V
V_DDPLL + 0.3 V
0.25*V_DDPLL V
—
V
15 C EXTAL Pin Input Hysteresis
V_HYS,EXTAL
—
180
—
mV
16
C
EXTAL Pin oscillation amplitude (loop controlled
Pierce)
V_PP,EXTAL
—
0.9
—
V
1. Depending on the crystal a damping series resistor might be necessary
2. Only valid if full swing Pierce oscillator/external clock mode is selected
3. These values apply for carefully designed PCB layouts with capacitors that match the crystal/resonator requirements..
4. Only applies if EXTAL is externally driven
1238
MC9S12XE-Family Reference Manual Rev. 1.25
Freescale Semiconductor