參數(shù)資料
型號： 9S12E128DGV1
廠商： Motorola, Inc.
英文描述： MC9S12E-Family Device User Guide V01.04
中文描述： MC9S12E -系列設備的用戶手冊V01.04
文件頁數(shù)： 123/156頁
文件大?。?/td> 3077K
代理商： 9S12E128DGV1
123
B.4.2 Oscillator
The device features an internal Colpitts and Pierce oscillator. The selection of Colpitts oscillator or Pierce
oscillator/external clock depends on the XCLKS signal which is sampled during reset. Pierce
oscillator/external clock mode allows the input of a square wave. Before asserting the oscillator to the
internal system clocks the quality of the oscillation is checked for each start from either power-on, STOP
or oscillator fail. t
CQOUT
specifies the maximum time before switching to the internal self clock mode after
POR or STOP if a proper oscillation is not detected. The quality check also determines the minimum
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-3 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
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 mode is selected
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
(4)
t
EXTL
9.5
ns
8
D External square wave pulse width high
(4)
t
EXTH
9.5
ns
9
D External square wave rise time
(4)
t
EXTR
1
ns
10
D External square wave fall time
(4)
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
0.7*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
0.3*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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