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參數(shù)資料
| 型號： | MC68HC05P9AVP |
| 廠商： | MOTOROLA INC |
| 元件分類： | 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 |
| 文件頁數(shù)： | 29/90頁 |
| 文件大?。?/td> | 285K |
| 代理商： | MC68HC05P9AVP |
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GENERAL RELEASE SPECIFICATION
MC68HC05P9A
LOW POWER MODES
MOTOROLA
Rev. 2.0
6-1
SECTION 6
LOW POWER MODES
The MC68HC05P9A is capable of running in a low-power mode in each of its
congurations. The WAIT and STOP instructions provide two modes that reduce
the power required for the MCU by stopping various internal clocks and/or the on-
chip oscillator. The STOP and WAIT instructions are not normally used if the COP
watchdog timer is enabled. The stop conversion mask option is used to modify the
behavior of the STOP instruction from stop mode to halt mode. The ow of the
stop, halt, and wait modes is shown in Figure 6-1.
6.1
STOP Instruction
The STOP instruction can result in one of two modes of operation, depending on
the stop conversion mask option. If the stop conversion is not chosen, the STOP
instruction will behave like a normal STOP instruction in the MC68HC05 Family
and place the MCU in the stop mode. If the stop conversion is chosen, the STOP
instruction will behave like a WAIT instruction (with the exception of a variable
delay at startup) and place the MCU in the halt mode.
6.1.1 Stop Mode
Execution of the STOP instruction without conversion to halt places the MCU in its
lowest power consumption mode. In the stop mode the internal oscillator is turned
off, halting
all internal processing, including the COP watchdog timer. Execution
of the STOP instruction automatically clears the I bit in the condition code register
so that the IRQ external interrupt is enabled. All other registers and memory
remain unaltered. All input/output lines remain unchanged.
The MCU can be brought out of the stop mode only by an IRQ external interrupt
or an externally generated RESET. When exiting the stop mode, the internal
oscillator will resume after a 4064 PH2 clock cycle oscillator stabilization delay.
NOTE
Execution of the STOP instruction without conversion to halt (via
mask option) will cause the oscillator to stop, and therefore disable
the COP watchdog timer. If the COP watchdog timer is used, the
stop mode should be changed to the halt mode by selecting the
appropriate mask option.
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