參數(shù)資料
型號(hào): MC9S12C32CFA
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP48
封裝: LQFP-48
文件頁(yè)數(shù): 71/94頁(yè)
文件大小: 906K
代理商: MC9S12C32CFA
Device User Guide — 9S12C32DGV1/D V01.01
73
time tUPOSC. The device features a clock monitor. A time-out is asserted if the frequency of the incoming
clock signal is below the Clock Monitor FailureAssert Frequency fCMFA.
A.4.3 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.
A.4.3.1 XFC Component Selection
This section describes the selection of the XFC components to achieve a good filter characteristics.
Table A-16 Oscillator Characteristics
Conditions are shown in Table A-4 unless otherwise noted
Num
Rating
Symbol
Min
Typ
Max
Unit
1
Crystal oscillator range
fOSC
0.5
16
MHz
2
Startup Current
iOSC
100
A
3
Oscillator start-up time from POR, LVR or STOP
nUPOSC
4100
cycOSC
4
Oscillator start-up time
tUPOSC
81
NOTES:
1. fosc = 4MHz, C = 22pF
400
ms
5
Clock Quality check time-out
tCQOUT
0.45
2.5
s
6
Clock Monitor Failure Assert Frequency
fCMFA
50
100
200
ΚΗz
7
External square wave input frequency2
2. XCLKS =0 during reset
fEXT
0.5
50
MHz
8
External square wave pulse width low
tEXTL
9.5
ns
9
External square wave pulse width high
tEXTH
9.5
ns
10
External square wave rise time
tEXTR
1ns
11
External square wave fall time
tEXTF
1ns
12
Input Capacitance (EXTAL, XTAL inputs)
CIN
7pF
13
DC Operating Bias in Colpitts Conguration on
EXTAL Pin
VDCBIAS
1.1
V
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