S912XHY128F0VLM Datasheet, PDF (748/802 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

Electrical Characteristics
A.6.2 Oscillator
Table A-21. Oscillator Characteristics
Conditions are shown in Table A-4. unless otherwise noted
Num C
Rating
1a C Crystal oscillator range (loop controlled Pierce)
2 P Startup Current
3a C _{Oscillator start-up time (LCP, 4MHz)}¹
3b C _{Oscillator start-up time (LCP, 8MHz)}¹
3c C _{Oscillator start-up time (LCP, 16MHz)}¹
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}^,2
14 P EXTAL Pin Input Low Voltage
T ^{EXTAL Pin Input Low Voltage,2}
Symbol
f_OSC
i_OSC
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
Min
4.0
100
—
—
—
0.45
200
2.0
9.5
9.5
—
—
—
0.75*V_DDPLL
—
—
V_IL,EXTAL V_SSPLL - 0.3
Typ
—
—
2.2
1.1
0.75
—
400
—
—
—
—
—
7
—
—
—
—
Max Unit
16
MHz
—
µA
10
ms
8
ms
5
ms
2.5
s
800
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 ^{These values apply for carefully designed PCB layouts with capacitors that match the crystal/resonator requirements..}
2 ^{Only applies if EXTAL is externally driven}
A.6.3 Phase Locked Loop
A.6.3.1 Jitter Information
With each transition of the clock f_cmp, the deviation from the reference clock f_ref is measured and input
voltage to the VCO is adjusted accordingly.The adjustment is done continuously with no abrupt changes
in the clock output frequency. Noise, voltage, temperature and other factors cause slight variations in the
MC9S12XHY-Family Reference Manual, Rev. 1.01
748
Freescale Semiconductor