參數(shù)資料
型號： MC9S12DG256B
廠商： 飛思卡爾半導體(中國)有限公司
英文描述： device made up of standard HCS12 blocks and the HCS12 processor core
中文描述： 設備組成水平的HCS12塊和HCS12的處理器核心
文件頁數(shù)： 108/128頁
文件大?。?/td> 2560K
代理商： MC9S12DG256B
MC9S12DP256B Device User Guide — V02.14
108
A.5.1.4 Stop Recovery
Out of STOP the controller can be woken up by an external interrupt. A clock quality check as after POR
is performed before releasing the clocks to the system.
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 oscillator. By asserting the XCLKS input during reset this
oscillator can be bypassed allowing 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
1
C Crystal oscillator range
f
OSC
0.5
16
MHz
2
P Startup Current
i
OSC
100
μ
A
3
C Oscillator start-up time
t
UPOSC
8
1
NOTES
:
1. f
osc
= 4MHz, C = 22pF.
2. Maximum value is for extreme cases using high Q, low frequency crystals
3. XCLKS =0 during reset
100
2
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
3
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
9
pF
12
C
DC Operating Bias in Colpitts Configuration on
EXTAL Pin
V
DCBIAS
1.1
V
F
For More Information On This Product,
Go to: www.freescale.com
n
.
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