參數(shù)資料
型號(hào)： 9S12KT256DGV1
英文描述： MC9S12KT256 Device User Guide
中文描述： MC9S12KT256設(shè)備用戶指南
文件頁數(shù)： 106/126頁
文件大小： 7307K
代理商： 9S12KT256DGV1
Device User Guide — 9S12KT256DGV1/D V01.09
106
Freescale Semiconductor
A.7.1.5 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.7.2 Oscillator
The device features an internal low-power loop controlled Pierce oscillator and a full swing Pierce
oscillator/external clock mode. The selection of loop controlled Pierce oscillator or full swing Pierce
oscillator/external clock depends on the XCLKS signal which is sampled during reset. Full swing 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 A-19 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 (loop controlled Pierce)
f
OSC
4.0
16
MHz
1b
C Crystal oscillator range (full swing Pierce)
1,2
NOTES
:
1. Depending on the crystal a damping series resistor might be necessary
f
OSC
0.5
40
MHz
2
P Startup Current
i
OSC
100
μ
A
3
C Oscillator start-up time (loop controlled Pierce)
t
UPOSC
3
3
50
4
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
2
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
P EXTAL Pin Input High Voltage
V
IH,EXTAL
0.7*V
DDPLL
V
T EXTAL Pin Input High Voltage
V
IH,EXTAL
V
DDPLL
+ 0.3
V
13
P EXTAL Pin Input Low Voltage
V
IL,EXTAL
0.3*V
DDPLL
V
T EXTAL Pin Input Low Voltage
V
IL,EXTAL
V
SSPLL
- 0.3
V
14
C EXTAL Pin Input Hysteresis
V
HYS,EXTAL
250
mV
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