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| 型号： | MC68HC05K3CP |
| 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 MHz, MICROCONTROLLER, PDIP16 |
| 封装： | PLASTIC, DIP-16 |
| 文件页数： | 83/132页 |
| 文件大小： | 2612K |
| 代理商： | MC68HC05K3CP |
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Technical Data
MC68HC05K3 — Rev. 5
Operational Modes
Operational Modes
6.3.1 Stop Mode
The STOP instruction can result in one of two modes of operation
depending on its mask option. The mask option can make the STOP
instruction operate the same as the STOP instruction in other M68HC05
Family members and place the device in stop mode. Or the mask option
can make the STOP instruction behave like a WAIT instruction (except
that the restart time involves a delay) and place the device in halt mode.
The mask option enabling the execution of the STOP instruction places
the MCU in its lowest power consumption mode. In stop mode, the
internal oscillator is turned off, halting all internal processing, including
the COP watchdog timer.
When the CPU enters stop mode, the interrupt flags (TOF and RTIF) and
the interrupt enable bits (TOFE and RTIE) in the TSCR are cleared by
internal hardware to remove any pending timer interrupt requests and to
disable any further timer interrupts. Execution of the STOP instruction
automatically clears the I bit in the condition code register and sets the
IRQE enable bit in the IRQ status/control register so that the IRQ
external interrupt is enabled. All other memory and registers, including
the other bits in the TSCR, remain unaltered.
The MCU can be brought out of stop mode only by an IRQ external
interrupt, an IRQ from port A (if mask option is enabled), or an externally
generated RESET. When exiting stop mode, the internal oscillator
resumes after an oscillator stabilization delay of either 16 or 4064 cycles
(depending on mask option state) of the internal processor clock.
NOTE:
If enabled by a mask option, the STOP instruction causes the oscillator
to stop and, therefore, disable the COP watchdog timer. If the COP
watchdog timer is used and the part is never intended to enter stop
mode, the mask option that should be used is the one that disables the
STOP instruction and changes the stop mode to the halt mode. See
6.3.4 COP Watchdog Timer Considerations for more details.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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ARCHIVED
BY
FREESCALE
SEMICONDUCT
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INC.
2006
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