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参数资料
型号： MC9S12B128CFU25
厂商： FREESCALE SEMICONDUCTOR INC
元件分类： 微控制器/微处理器
英文描述： 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP80
封装： PLASTIC, QFP-80
文件页数： 15/132页
文件大小： 1842K
代理商： MC9S12B128CFU25
Device User Guide —9S12B128DGV1/D V01.13
111
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-20 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
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 (Colpitts)
tUPOSC
82
2. fosc = 4MHz, C = 22pF.
1003
3. Maximum value is for extreme cases using high Q, low frequency crystals
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
4. Only valid if Pierce oscillator/external clock mode is selected
fEXT
0.5
50
MHz
7D External square wave pulse width low 4
tEXTL
9.5
ns
8D External square wave pulse width high4
tEXTH
9.5
ns
9D External square wave rise time4
tEXTR
1ns
10
D External square wave fall time4
tEXTF
1ns
11
D Input Capacitance (EXTAL, XTAL pins)
CIN
7pF
12
C
DC Operating Bias in Colpitts Conguration on
EXTAL Pin
VDCBIAS
1.1
V
13
P EXTAL Pin Input High Voltage4
VIH,EXTAL 0.75*VDDPLL
V
T EXTAL Pin Input High Voltage4
VIH,EXTAL
VDDPLL + 0.3
V
14
P EXTAL Pin Input Low Voltage4
VIL,EXTAL
0.25*VDDPLL
V
T EXTAL Pin Input Low Voltage4
VIL,EXTAL
VSSPLL - 0.3
V
15
C EXTAL Pin Input Hysteresis4
VHYS,EXTAL
250
mV
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