參數(shù)資料
型號: MC68HC705F4FB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 1.789 MHz, MICROCONTROLLER, PQFP44
封裝: PLASTIC, QFP-44
文件頁數(shù): 105/130頁
文件大小: 10504K
代理商: MC68HC705F4FB
8-2
MC68HC05F4
RESETS AND INTERRUPTS
8
8.1.3
Illegal address reset
When an opcode fetch occurs from an address which is not part of the RAM ($0040 – $013F) or
of the ROM ($3000 – $3FFF) or EEPROM ($0200 – $02FF), the device is automatically reset.
Note:
No RTS or RTI instruction should be placed at the end of a memory block since this
could result in an illegal address reset.
8.1.4
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 timeout, 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 timeout was generated.
The COP function is a mask option, enabled or disabled during device manufacture. See
Refer to Section 5.3 for more information on the COP watchdog timer.
8.1.5
Low voltage reset
The MCU contains a low voltage detection circuit which drives the external reset.
For a positive transition of supply voltage VDD, the low voltage reset occurs as long as VDD is below
the VRON level. In this case the external reset pin is pulled down. If the supply voltage drops off
above the VRON level, the reset is released. If the supply voltage falls off below the VROFF level,
the RESET pin is pulled down.
TPG
72
05F4Book Page 2 Tuesday, August 5, 1997 1:10 pm
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關(guān)PDF資料
PDF描述
MC68HC05F4FB 8-BIT, MROM, 1.789 MHz, MICROCONTROLLER, PQFP44
MC68HC05F4CDW 8-BIT, MROM, 1.789 MHz, MICROCONTROLLER, PDSO28
MC68HC705G4 8-BIT, OTPROM, 1 MHz, MICROCONTROLLER, PQFP80
MC68HC05G3 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PQFP80
MC68HC705J5ACJP 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP16
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC705G1B 制造商:Rochester Electronics LLC 功能描述:- Bulk
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