參數(shù)資料
型號： MC9S12A256
廠商： Motorola, Inc.
英文描述： MC9S12DT256 Device User Guide V03.03
中文描述： MC9S12DT256設(shè)備的用戶手冊V03.03
文件頁數(shù)： 106/124頁
文件大?。?/td> 2125K
代理商： MC9S12A256
MC9S12DP512 Device Guide V01.23
106
A.5.1.5 Pseudo Stop and Wait Recovery
The recovery from Pseudo STOP and Wait are essentially the same since the oscillator was not stopped in
both modes. The controller can be woken up by internal or external interrupts. After t
wrs
the CPU starts
fetching the interrupt vector.
A.5.2 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
oroscillatorfail.t
CQOUT
specifiesthemaximumtimebeforeswitchingtotheinternalselfclockmodeafter
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 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
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
0.75*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
SSPLL
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
For More Information On This Product,
Go to: www.freescale.com
n
.
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