- 您现在的位置：买卖IC网 > PDF目录80582 > MC68HC05V7CB (FREESCALE SEMICONDUCTOR INC) 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP56 PDF资料下载
参数资料
| 型号： | MC68HC05V7CB |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP56 |
| 封装： | SDIP-56 |
| 文件页数： | 123/170页 |
| 文件大小： | 980K |
| 代理商： | MC68HC05V7CB |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页第105页第106页第107页第108页第109页第110页第111页第112页第113页第114页第115页第116页第117页第118页第119页第120页第121页第122页当前第123页第124页第125页第126页第127页第128页第129页第130页第131页第132页第133页第134页第135页第136页第137页第138页第139页第140页第141页第142页第143页第144页第145页第146页第147页第148页第149页第150页第151页第152页第153页第154页第155页第156页第157页第158页第159页第160页第161页第162页第163页第164页第165页第166页第167页第168页第169页第170页
MOTOROLA
SECTION 6: RESETS
Page 42
MC68HC05V7 Specification Rev. 1.0
6.2.3
COMPUTER OPERATING PROPERLY RESET (COPR)
The MCU contains a watchdog timer that automatically times out if not reset (cleared) within
a specific time by a program reset sequence. If the COP watchdog timer is allowed to time-
out, an internal reset is generated to reset the MCU. Regardless of an internal or external
RESET, the MCU comes out of a COP reset according to the standard rules of mode
selection.
The COP reset function is enabled or disabled by a mask option and is verified during
production testing.
The COP Watchdog reset will activate the internal pulldown device connected to the
RESET pin.
6.2.3.1
RESETTING THE COP
Preventing a COP reset is done by writing a “0” to the COPF bit. This action will reset the
counter and begin the time-out period again. The COPF bit is bit 0 of address $3FF0. A
read of address $3FF0 will return user data programmed at that location.
6.2.3.2
COP DURING WAIT MODE
The COP will continue to operate normally during WAIT mode. The software should pull the
device out of WAIT mode periodically and reset the COP by writing to the COPF bit to
prevent a COP reset.
6.2.3.3
COP DURING STOP MODE
When the STOP enable mask option is selected, STOP mode disables the oscillator circuit
and thereby turns the clock off for the entire device. The COP counter will be reset when
STOP mode is entered. If a reset is used to exit STOP mode, the COP counter will be held
in reset during the 4064 cycles of start up delay. If any operable interrupt is used to exit
STOP mode, the COP counter will not be reset during the 4064 cycle start up delay and
will have that many cycles already counted when control is returned to the program.
6.2.3.4
COP WATCHDOG TIMER CONSIDERATIONS
The COP Watchdog Timer is active in all modes of operation if enabled by a mask option.
If the COP Watchdog Timer is selected by a mask option, any execution of the STOP
instruction (either intentional or inadvertent due to the CPU being disturbed) will cause the
oscillator to halt and prevent the COP Watchdog Timer from timing out. Therefore, it is
recommended that the STOP instruction should be disabled if the COP Watchdog Timer
is enabled.
If the COP Watchdog Timer is selected by a mask option, the COP will reset the MCU when
it times out. Therefore, it is recommended that the COP Watchdog should be disabled for
a system that must have intentional uses of the WAIT Mode for periods longer than the
COP time-out period.
The recommended interactions and considerations for the COP Watchdog Timer, STOP
instruction, and WAIT instruction are summarized in Table 6-1.
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
..
.
相关PDF资料 |
PDF描述 |
|---|---|
| MC68HC711EA9VFS3 | 8-BIT, UVPROM, 3 MHz, MICROCONTROLLER, CQCC52 |
| MPC7400RX350TX | 32-BIT, 350 MHz, RISC PROCESSOR, CBGA360 |
| MPC8250ACVRLHDX | 32-BIT, 250 MHz, RISC PROCESSOR, PBGA516 |
| MC68HC11L1VFU2 | 8-BIT, 2 MHz, MICROCONTROLLER, PQFP64 |
| MC68HC08JL3CP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MC68HC05X16 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:High-density complementary metal oxide semiconductor HCMOS) microcontroller unit |
| MC68HC05X32 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:High-density complementary metal oxide semiconductor HCMOS) microcontroller unit |
| MC68HC05X4 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC05X4CDW | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC05X4DW | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
发布紧急采购，3分钟左右您将得到回复。