- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄69027 > MC68HC08GP8ACFB (FREESCALE SEMICONDUCTOR INC) 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, PQFP44 PDF資料下載
參數(shù)資料
| 型號： | MC68HC08GP8ACFB |
| 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 |
| 文件頁數(shù)： | 75/126頁 |
| 文件大?。?/td> | 4243K |
| 代理商： | MC68HC08GP8ACFB |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁當前第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁
Clock Generator Module (CGM)
Data Sheet
MC68HC08GP8A
52
Clock Generator Module (CGM)
MOTOROLA
Software must wait a given time, tAL, after entering tracking mode before
selecting the PLL as the clock source to CGMOUT (BCS = 1).
The LOCK bit is disabled.
CPU interrupts from the CGM are disabled.
4.3.6 Programming the PLL
The following procedure shows how to program the PLL.
NOTE:
The round function in the following equations means that the real number should
be rounded to the nearest integer number.
1.
Choose the desired bus frequency, fBUSDES.
2.
Calculate the desired VCO frequency (four times the desired bus
frequency).
3.
Choose a practical PLL (crystal) reference frequency, fRCLK, and the
reference clock divider, R. Typically, the reference crystal is 32.768 kHz and
R = 1.
Frequency errors to the PLL are corrected at a rate of fRCLK/R. For stability
and lock time reduction, this rate must be as fast as possible. The VCO
frequency must be an integer multiple of this rate. The relationship between
the VCO frequency, fVCLK, and the reference frequency, fRCLK, is
P, the power of two multiplier, and N, the range multiplier, are integers.
In cases where desired bus frequency has some tolerance, choose fRCLK to
a value determined either by other module requirements (such as modules
which are clocked by CGMXCLK), cost requirements, or ideally, as high as
the specified range allows. See Section 20. Electrical Specifications.
Choose the reference divider, R = 1. After choosing N and P, the actual bus
frequency can be determined using equation in 2 above.
When the tolerance on the bus frequency is tight, choose fRCLK to an integer
divisor of fBUSDES, and R = 1. If fRCLK cannot meet this requirement, use the
following equation to solve for R with practical choices of fRCLK, and choose
the fRCLK that gives the lowest R.
f
VCLKDES
4f
BUSDES
×
=
f
VCLK
2
P
N
R
----------- f
RCLK
()
=
R
round R
MAX
f
VCLKDES
f
RCLK
--------------------------
integer
f
VCLKDES
f
RCLK
--------------------------
–
×
=
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 |
|---|---|
| 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 |
| MC68HC08KL8B | 8-BIT, OTPROM, 1.5 MHz, MICROCONTROLLER, PDIP42 |
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，3分鐘左右您將得到回復。