參數(shù)資料
型號: MC9S12C128CPB25
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, PQFP52
封裝: LQFP-52
文件頁數(shù): 17/138頁
文件大?。?/td> 2318K
代理商: MC9S12C128CPB25
Device User Guide — 9S12C128DGV1/D V01.07
111
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.
B.6.3 Phase Locked Loop
The oscillator provides the reference clock for the PLL. The PLLs Voltage Controlled Oscillator (VCO)
is also the system clock source in self clock mode.
B.6.3.1 XFC Component Selection
This section describes the selection of the XFC components to achieve a good filter characteristics.
Table B-11 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(4)
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 selected (XCLKS =0 during reset)
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
1ns
10
D
External square wave fall time
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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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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