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參數(shù)資料
| 型號(hào)： | MC68HC05C9AMFN |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 53/124頁 |
| 文件大?。?/td> | 774K |
| 代理商： | MC68HC05C9AMFN |
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Resets
MC68HC05C9A Advance Information Data Sheet, Rev. 5.1
34
Freescale Semiconductor
5.3 RESET Pin
The MCU is reset when a logic 0 is applied to the RESET input for a period of one and one-half machine
cycles (tRL). However, to differentiate between an external reset and an internal reset (generated from the
COP or clock monitor), any externally driven reset must be active (logic 0) for at least eight tcyc.
Figure 5-2. Power-On Reset and RESET
5.4 Computer Operating Properly (COP) Reset
This device includes a watchdog COP feature which guards against program run-away failures. A timeout
of the COP timer generates a COP reset. The COP watchdog is a software error detection system that
automatically times out and resets the MCU if not cleared periodically by a program sequence.
The COP is controlled with two registers, one to reset the COP timer and the other to enable and control
COP and clock monitor functions.
Figure 5-3 shows a block diagram of the COP.
RESET
OSC1
(2)
INTERNAL
CLOCK
(1)
INTERNAL
ADDRESS
BUS
(1)
V
DD
INTERNAL
DATA
BUS
(1)
t
RL
NEW
PCH
NEW
PCL
OP
CODE
OP
CODE
PCH
PCL
t
CYC
4064
t
VDDR
DUMMY
$3FFF
NEW
PC
NEW
PC
$3FFE
NEW
PC
NEW
PC
$3FFE
$3FFF
$3FFE
DUMMY
Notes:
1. Internal timing signal and bus information are not available externally.
2. OSC1 line is not meant to represent frequency. It is meant to represent only time.
3. The next rising edge of the internal processor clock following the rising edge of RESET initiates the reset sequence.
NOTE 4
4. RESET outputs VOL during 4064 power-on reset cycles.
NOTE 3
t
CYC
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相關(guān)代理商/技術(shù)參數(shù) |
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| MC68HC05C9AMP | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
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| MC68HC05C9E | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC68HC05C9ECFB | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
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