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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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68HC705SP7 датащи(PDF) 64 Page - NXP Semiconductors |
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68HC705SP7 датащи(HTML) 64 Page - NXP Semiconductors |
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64 / 230 page  Resets General Release Specification MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0 Resets 5.5.3 Low-Voltage Reset (LVR) The LVR activates the RST reset signal to reset the device when the voltage on the VDD pin falls below the LVR trip voltage. The LVR will assert the pulldown device to pull the RESET pin low for three to four cycles of the internal bus. The LVR reset function can be enabled or disabled by programming the LVREN bit in the MOR. NOTE: The LVR is intended for applications where the VDD supply voltage normally operates above 4.5 volts. 5.5.4 Illegal Address Reset An opcode fetch (execution of an instruction) at an address that is not in the EPROM (locations $0700–$1FFF) or the RAM (locations $0020–$00FF) generates an illegal address reset. The illegal address reset will assert the pulldown device to pull the RESET pin low for three to four cycles of the internal bus. 5.6 Reset States The following paragraphs describe how the various resets initialize the MCU. 5.6.1 CPU A reset has the following effects on the CPU: • Loads the stack pointer with $FF • Sets the I bit in the condition code register, inhibiting interrupts • Loads the program counter with the user defined reset vector from locations $1FFE and $1FFF • Clears the stop latch, enabling the CPU clock • Clears the wait latch, bringing the CPU out of the wait mode Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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