Device User Guide — 9S12DT128DGV2/D V02.16
121
Freescale Semiconductor
Clock Monitor Failure is asserted if the frequency of the incoming clock signal is below the Assert
Frequency f
CMFA.
A.5.3 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.5.3.1 XFC Component Selection
This section describes the selection of the XFC components to achieve a good filter characteristics.
Table A-15 Oscillator Characteristics
Conditions are shown in (Table A-4) unless otherwise noted
Num C
Rating
Symbol
Min
Typ
Max
Unit
1a
C Crystal oscillator range (Colpitts)
f
OSC
0.5
16
MHz
1b
C Crystal oscillator range (Pierce)
1
NOTES
:
1. Depending on the crystal a damping series resistor might be necessary
f
OSC
0.5
40
MHz
2
P Startup Current
i
OSC
100
µ
A
3
C Oscillator start-up time (Colpitts)
t
UPOSC
8
2
2. f
osc
= 4MHz, C = 22pF.
100
3
3. Maximum value is for extreme cases using high Q, low frequency crystals
ms
4
D Clock Quality check time-out
t
CQOUT
0.45
2.5
s
5
P Clock Monitor Failure Assert Frequency
f
CMFA
50
100
200
KHz
6
P External square wave input frequency
4
4. XCLKS =0 during reset
f
EXT
0.5
50
MHz
7
D External square wave pulse width low
t
EXTL
9.5
ns
8
D External square wave pulse width high
t
EXTH
9.5
ns
9
D External square wave rise time
t
EXTR
1
ns
10
D External square wave fall time
t
EXTF
1
ns
11
D Input Capacitance (EXTAL, XTAL pins)
C
IN
7
pF
12
C
DC Operating Bias in Colpitts Configuration on
EXTAL Pin
V
DCBIAS
1.1
V
13
P EXTAL Pin Input High Voltage
4
V
IH,EXTAL
0.75*V
DDPLL
V
T EXTAL Pin Input High Voltage
4
V
IH,EXTAL
V
DDPLL
+ 0.3
V
14
P EXTAL Pin Input Low Voltage
4
V
IL,EXTAL
0.25*V
DDPLL
V
T EXTAL Pin Input Low Voltage
4
V
IL,EXTAL
V
SSPLL
- 0.3
V
15
C EXTAL Pin Input Hysteresis
4
V
HYS,EXTAL
250
mV
Содержание MC9S12A128
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