MC9S12DT512 View Datasheet(PDF) - Freescale Semiconductor
Part Name
Description
MFG CO.
'MC9S12DT512' PDF : 124 Pages View PDF
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
1a C Crystal oscillator range (Colpitts)
1b C Crystal oscillator range (Pierce) 1
2 P Startup Current
3 C Oscillator start-up time (Colpitts)
4 D Clock Quality check time-out
5 P Clock Monitor Failure Assert Frequency
6 P External square wave input frequency 4
7 D External square wave pulse width low 4
8 D External square wave pulse width high 4
9 D External square wave rise time 4
10 D External square wave fall time 4
11 D Input Capacitance (EXTAL, XTAL pins)
12
C
DC Operating Bias in Colpitts Configuration on
EXTAL Pin
13 P EXTAL Pin Input High Voltage 4
T EXTAL Pin Input High Voltage 4
14 P EXTAL Pin Input Low Voltage 4
T EXTAL Pin Input Low Voltage 4
15 C EXTAL Pin Input Hysteresis 4
Symbol
fOSC
fOSC
iOSC
tUPOSC
tCQOUT
fCMFA
fEXT
tEXTL
tEXTH
tEXTR
tEXTF
CIN
Min
0.5
0.5
100
-
0.45
50
0.5
9.5
9.5
-
-
-
VDCBIAS
-
VIH,EXTAL 0.75*VDDPLL
VIH,EXTAL
-
VIL,EXTAL
-
VIL,EXTAL VSSPLL - 0.3
VHYS,EXTAL
-
Typ
-
-
-
82
-
100
-
-
-
-
-
7
1.1
-
-
-
-
250
Max
16
40
-
1003
2.5
200
50
-
-
1
1
-
Unit
MHz
MHz
µA
ms
s
KHz
MHz
ns
ns
ns
ns
pF
-
V
-
V
VDDPLL + 0.3 V
0.25*VSSPLL V
-
V
-
mV
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