參數(shù)資料
型號(hào): 9S12C128DGV1
英文描述: MC9S12C Family Device User Guide
中文描述: MC9S12C家庭設(shè)備用戶指南
文件頁(yè)數(shù): 111/136頁(yè)
文件大小: 2190K
代理商: 9S12C128DGV1
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111
oscillator start-up time t
UPOSC
. The device also features a clock monitor. A Clock Monitor Failure is
asserted if the frequency of the incoming clock signal is below the Assert Frequency f
CMFA.
Table B-11 Oscillator Characteristics
B.6.3 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.
B.6.3.1 XFC Component Selection
This section describes the selection of the XFC components to achieve a good filter 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(4)
NOTES
:
1. Depending on the crystal a damping series resistor might be necessary
2. f
osc
= 4MHz, C = 22pF.
3. Maximum value is for extreme cases using high Q, low frequency crystals
4. Only valid if Pierce Oscillator/external clock selected (XCLKS =0 during reset)
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
100
3
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
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
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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