參數(shù)資料
型號(hào): HCS12COREUG
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: Device User Guide V01.18
中文描述: 設(shè)備的用戶手冊(cè)V01.18
文件頁數(shù): 108/130頁
文件大?。?/td> 512K
代理商: HCS12COREUG
MC9S12H256 Device User Guide — V01.18
A.4.1.4 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.4.1.5 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.4.2 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-14 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
D Oscillator start-up time from POR or STOP
n
UPOSC
4100
cyc
OSC
4
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
100
2
ms
5
D Clock Quality check time-out
t
CQOUT
0.45
2.5
s
6
P Clock Monitor Failure Assert Frequency
f
CMFA
50
100
200
KHz
7
P External square wave input frequency
3
f
EXT
0.5
32
MHz
8
D External square wave pulse width low
t
EXTL
15
ns
9
D External square wave pulse width high
t
EXTH
15
ns
10
D External square wave rise time
t
EXTR
1
ns
11
D External square wave fall time
t
EXTF
1
ns
12
D Input Capacitance EXTAL pin
C
IN
9
pF
13
D Input Capacitance XTAL pin
C
IN
13
pF
14
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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