參數資料
型號: MC9S12KG64CFU
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, PQFP80
封裝: QFP-80
文件頁數: 9/126頁
文件大?。?/td> 6758K
代理商: MC9S12KG64CFU
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 twrs 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. 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-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)
fOSC
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
fOSC
0.5
40
MHz
2
P Startup Current
iOSC
100
A
3
C Oscillator start-up time (loop controlled Pierce)
tUPOSC
33
504
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
6
P External square wave input frequency 2
fEXT
0.5
50
MHz
7
D External square wave pulse width low
tEXTL
9.5
ns
8
D External square wave pulse width high
tEXTH
9.5
ns
9
D External square wave rise time
tEXTR
1
ns
10
D External square wave fall time
tEXTF
1
ns
11
D Input Capacitance (EXTAL, XTAL pins)
CIN
7
pF
12
P EXTAL Pin Input High Voltage
VIH,EXTAL
0.7*VDDPLL
V
T EXTAL Pin Input High Voltage
VIH,EXTAL
VDDPLL + 0.3
V
13
P EXTAL Pin Input Low Voltage
VIL,EXTAL
0.3*VDDPLL
V
T EXTAL Pin Input Low Voltage
VIL,EXTAL
VSSPLL - 0.3
V
14
C EXTAL Pin Input Hysteresis
VHYS,EXTAL
250
mV
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