- 您現(xiàn)在的位置：買賣IC網 > 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)： | 95/126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頁當前第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
Computer Operating Properly (COP)
Data Sheet
MC68HC08GP8A
70
Computer Operating Properly (COP)
MOTOROLA
The COP counter is a free-running 6-bit counter preceded by a 12-bit prescaler
counter. If not cleared by software, the COP counter overflows and generates an
asynchronous reset after 218 –24 or 213 –24 CGMXCLK cycles, depending on the
state of the COP rate select bit, COPRS, in the mask option register. With a
213 –24 CGMXCLK cycle overflow option, a 32.768-kHz crystal gives a COP
timeout period of 250 ms. Writing any value to location $FFFF before an overflow
occurs prevents a COP reset by clearing the COP counter and stages 12 through
5 of the prescaler.
NOTE:
Service the COP immediately after reset and before entering or after exiting stop
mode to guarantee the maximum time before the first COP counter overflow.
A COP reset pulls the RST pin low for 32 CGMXCLK cycles and sets the COP bit
in the reset status register (RSR).
In monitor mode, the COP is disabled if the RST pin or the IRQ is held at VTST.
During the break state, VTST on the RST pin disables the COP.
NOTE:
Place COP clearing instructions in the main program and not in an interrupt
subroutine. Such an interrupt subroutine could keep the COP from generating a
reset even while the main program is not working properly.
5.3 I/O Signals
The following paragraphs describe the signals shown in Figure 5-1.
5.3.1 CGMXCLK
CGMXCLK is the crystal oscillator output signal. CGMXCLK frequency is equal to
the crystal frequency.
5.3.2 STOP Instruction
The STOP instruction clears the COP prescaler.
5.3.3 COPCTL Write
Writing any value to the COP control register (COPCTL) (see 5.4 COP Control
Register) clears the COP counter and clears bits 12 through 5 of the prescaler.
Reading the COP control register returns the low byte of the reset vector.
5.3.4 Power-On Reset
The power-on reset (POR) circuit clears the COP prescaler 4096 CGMXCLK
cycles after power-up.
5.3.5 Internal Reset
An internal reset clears the COP prescaler and the COP counter.
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 |
相關代理商/技術參數(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。