參數(shù)資料
型號: MC9S12DT512VPV
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP112
封裝: ROHS COMPLIANT, LQFP-112
文件頁數(shù): 9/124頁
文件大?。?/td> 4657K
代理商: MC9S12DT512VPV
MC9S12DP512 Device Guide V01.25
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 twrs 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
or oscillator fail. tCQOUT 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 tUPOSC . 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 fCMFA.
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)
fOSC
0.5
-
16
MHz
1b
C Crystal oscillator range (Pierce) 1
fOSC
0.5
-
40
MHz
2
P Startup Current
iOSC
100
-
A
3
C Oscillator start-up time (Colpitts)
tUPOSC
-
82
1003
ms
4
D Clock Quality check time-out
tCQOUT
0.45
-
2.5
s
5
P Clock Monitor Failure Assert Frequency
fCMFA
50
100
200
KHz
6P External square wave input frequency 4
fEXT
0.5
-
50
MHz
7D External square wave pulse width low 4
tEXTL
9.5
-
ns
8D External square wave pulse width high 4
tEXTH
9.5
-
ns
9D External square wave rise time 4
tEXTR
--
1
ns
10
D External square wave fall time 4
tEXTF
--
1
ns
11
D Input Capacitance (EXTAL, XTAL pins)
CIN
-7
-
pF
12
C
DC Operating Bias in Colpitts Conguration on
EXTAL Pin
VDCBIAS
-
1.1
-
V
13
P EXTAL Pin Input High Voltage 4
VIH,EXTAL
0.75*VDDPLL
--
V
T EXTAL Pin Input High Voltage 4
VIH,EXTAL
--
VDDPLL + 0.3
V
14
P EXTAL Pin Input Low Voltage 4
VIL,EXTAL
--
0.25*VSSPLL
V
T EXTAL Pin Input Low Voltage 4
VIL,EXTAL
VSSPLL - 0.3
--
V
15
C EXTAL Pin Input Hysteresis 4
VHYS,EXTAL
-
250
-
mV
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