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參數(shù)資料
| 型號(hào)： | MC68HC05P9AP |
| 廠商： | MOTOROLA INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28 |
| 封裝： | PLASTIC, DIP-28 |
| 文件頁(yè)數(shù)： | 27/90頁(yè) |
| 文件大?。?/td> | 285K |
| 代理商： | MC68HC05P9AP |
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GENERAL RELEASE SPECIFICATION
MC68HC05P9A
RESETS
MOTOROLA
Rev. 2.0
5-1
SECTION 5
RESETS
The MCU can be reset three ways: by the initial power-on reset function, by an
active low input to the RESET pin, and by a computer operating properly (COP)
watchdog-timer timeout.
5.1
Power-On Reset (POR)
An internal reset is generated on power-up to allow the internal clock generator to
stabilize. The power-on reset is strictly for power turn-on conditions and should
not be used to detect a drop in the power supply voltage.
There is a 4064 internal processor clock cycle (tcyc) oscillator stabilization delay
after the oscillator becomes active. If the RESET pin is low at the end of this 4064-
cycle delay, the MCU will remain in the reset condition until RESET goes high.
5.2
RESET Pin
The MCU is reset when a logic zero is applied to the RESET input for a period of
one and one-half machine cycles (t
cyc).
5.3
Computer Operating Properly (COP) Reset
The MCU contains a watchdog timer that automatically times out if not reset
(cleared) within a specic 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. Because the internal RESET signal is used, the MCU comes out of a COP
reset in the same operating mode it was in when the COP time-out was
generated.
The COP reset function is enabled or disabled by a mask option.
Refer to SECTION 9 COMPUTER OPERATING PROPERLY (COP) for more
information on the COP.
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相關(guān)代理商/技術(shù)參數(shù) |
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| MC68HC05P9AVDW | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC05P9AVP | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC05P9DW | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNIT |
| MC68HC05P9P | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNIT |
| MC68HC05PV8 | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:Techinal Data - rev 1.9 |
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