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參數(shù)資料
| 型號： | MC68HC08GP8ACFB |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁數(shù)： | 4/126頁 |
| 文件大小： | 4243K |
| 代理商： | MC68HC08GP8ACFB |
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MC68HC08GP8A
Data Sheet
MOTOROLA
Low-Power Modes
101
Data Sheet — MC68HC08GP8A
Section 9. Low-Power Modes
9.1 Introduction
The MCU may enter two low-power modes: wait mode and stop mode. They are
common to all HC08 MCUs and are entered through instruction execution. This
section describes how each module acts in the low-power modes.
9.1.1 Wait Mode
The WAIT instruction puts the MCU in a low-power standby mode in which the CPU
clock is disabled but the bus clock continues to run. Power consumption can be
further reduced by disabling the LVI module and/or the timebase module through
bits in the mask option (MOR) register. See Section 11. Mask Option Registers
9.1.2 Stop Mode
Stop mode is entered when a STOP instruction is executed. The CPU clock is
disabled and the bus clock is disabled if the OSCSTOPENB bit in the MOR register
is at a logic 0. See Section 11. Mask Option Registers (MOR1 and MOR2).
9.2 Analog-to-Digital Converter (ADC)
9.2.1 Wait Mode
The ADC continues normal operation during wait mode. Any enabled CPU interrupt
request from the ADC can bring the MCU out of wait mode. If the ADC is not
required to bring the MCU out of wait mode, power down the ADC by setting
ADCH4–ADCH0 bits in the ADC status and control register before executing the
WAIT instruction.
9.2.2 Stop Mode
The ADC module is inactive after the execution of a STOP instruction. Any pending
conversion is aborted. ADC conversions resume when the MCU exits stop mode
after an external interrupt. Allow one conversion cycle to stabilize the analog
circuitry.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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