- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄69027 > MC68HC08GP8AMFB (FREESCALE SEMICONDUCTOR INC) 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, PQFP44 PDF資料下載
參數(shù)資料
| 型號(hào)： | MC68HC08GP8AMFB |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁(yè)數(shù)： | 73/126頁(yè) |
| 文件大?。?/td> | 4243K |
| 代理商： | MC68HC08GP8AMFB |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)第72頁(yè)當(dāng)前第73頁(yè)第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)第78頁(yè)第79頁(yè)第80頁(yè)第81頁(yè)第82頁(yè)第83頁(yè)第84頁(yè)第85頁(yè)第86頁(yè)第87頁(yè)第88頁(yè)第89頁(yè)第90頁(yè)第91頁(yè)第92頁(yè)第93頁(yè)第94頁(yè)第95頁(yè)第96頁(yè)第97頁(yè)第98頁(yè)第99頁(yè)第100頁(yè)第101頁(yè)第102頁(yè)第103頁(yè)第104頁(yè)第105頁(yè)第106頁(yè)第107頁(yè)第108頁(yè)第109頁(yè)第110頁(yè)第111頁(yè)第112頁(yè)第113頁(yè)第114頁(yè)第115頁(yè)第116頁(yè)第117頁(yè)第118頁(yè)第119頁(yè)第120頁(yè)第121頁(yè)第122頁(yè)第123頁(yè)第124頁(yè)第125頁(yè)第126頁(yè)
Clock Generator Module (CGM)
Data Sheet
MC68HC08GP8A
50
Clock Generator Module (CGM)
MOTOROLA
specified performance. With an external high-frequency clock source, use R to
divide the external frequency to between 30 kHz and 100 kHz.
The VCO’s output clock, CGMVCLK, running at a frequency, fVCLK, is fed back
through a programmable prescale divider and a programmable modulo divider.
The prescaler divides the VCO clock by a power-of-two factor P and the modulo
divider reduces the VCO clock by a factor, N. The dividers’ output is the VCO
feedback clock, CGMVDV, running at a frequency, fVDV =fVCLK/(N × 2
P). (See
4.3.6 Programming the PLL for more information.)
The phase detector then compares the VCO feedback clock, CGMVDV, with the
final reference clock, CGMRDV. A correction pulse is generated based on the
phase difference between the two signals. The loop filter then slightly alters the DC
voltage on the external capacitor connected to CGMXFC based on the width and
direction of the correction pulse. The filter can make fast or slow corrections
depending on its mode, described in 4.3.4 Acquisition and Tracking Modes. The
value of the external capacitor and the reference frequency determine the speed
of the corrections and the stability of the PLL.
The lock detector compares the frequencies of the VCO feedback clock, CGMVDV,
and the final reference clock, CGMRDV. Therefore, the speed of the lock detector
is directly proportional to the final reference frequency, fRDV. The circuit determines
the mode of the PLL and the lock condition based on this comparison.
4.3.4 Acquisition and Tracking Modes
The PLL filter is manually or automatically configurable into one of two operating
modes:
Acquisition mode — In acquisition mode, the filter can make large frequency
corrections to the VCO. This mode is used at PLL startup or when the PLL
has suffered a severe noise hit and the VCO frequency is far off the desired
frequency. When in acquisition mode, the ACQ bit is clear in the PLL
bandwidth control register. (See 4.5.2 PLL Bandwidth Control Register.)
Tracking mode — In tracking mode, the filter makes only small corrections
to the frequency of the VCO. PLL jitter is much lower in tracking mode, but
the response to noise is also slower. The PLL enters tracking mode when
the VCO frequency is nearly correct, such as when the PLL is selected as
the base clock source. (See 4.3.8 Base Clock Selector Circuit.) The PLL
is automatically in tracking mode when not in acquisition mode or when the
ACQ bit is set.
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
..
.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC68HC08GP8ACFB | 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, PQFP44 |
| MC68HC08JB1DWE | 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDSO20 |
| MC68HC08JB1DW | 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDSO20 |
| MC68HC08KH12AIPB | 8-BIT, MROM, 6 MHz, MICROCONTROLLER, PQFP52 |
| MC68HC08KL8FB | 8-BIT, OTPROM, 1.5 MHz, MICROCONTROLLER, PQFP52 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC08GR16A | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC68HC08GR32A | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC68HC08GR32ACFA | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC68HC08GR32ACFJ | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC68HC08GR32ACFU | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。