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参数资料
| 型号： | MB9AF314NBGL |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 40 MHz, RISC MICROCONTROLLER, PBGA112 |
| 封装： | 0.80 MM PITCH, PLASTIC, FBGA-112 |
| 文件页数： | 46/114页 |
| 文件大小： | 1357K |
| 代理商： | MB9AF314NBGL |
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ATmega48PA/88PA/168PA [DATASHEET]
9223F–AVR–04/14
10.6
Power-save Mode
When the SM2...0 bits are written to 011, the SLEEP instruction makes the MCU enter Power-save mode. This mode is
identical to power-down, with one exception:
If Timer/Counter2 is enabled, it will keep running during sleep. The device can wake up from either timer overflow or output
compare event from Timer/Counter2 if the corresponding Timer/Counter2 interrupt enable bits are set in TIMSK2, and the
global interrupt enable bit in SREG is set.
If Timer/Counter2 is not running, power-down mode is recommended instead of power-save mode.
The Timer/Counter2 can be clocked both synchronously and asynchronously in power-save mode. If Timer/Counter2 is not
using the asynchronous clock, the Timer/Counter oscillator is stopped during sleep. If Timer/Counter2 is not using the
synchronous clock, the clock source is stopped during sleep. Note that even if the synchronous clock is running in power-
save, this clock is only available for Timer/Counter2.
10.7
Standby Mode
When the SM2...0 bits are 110 and an external crystal/resonator clock option is selected, the SLEEP instruction makes the
MCU enter standby mode. This mode is identical to power-down with the exception that the oscillator is kept running. From
standby mode, the device wakes up in six clock cycles.
10.8
Extended Standby Mode
When the SM2...0 bits are 111 and an external crystal/resonator clock option is selected, the SLEEP instruction makes the
MCU enter extended standby mode. This mode is identical to power-save with the exception that the oscillator is kept
running. From extended standby mode, the device wakes up in six clock cycles.
10.9
Power Reduction Register
The power reduction register (PRR), see Section 10.11.3 “PRR – Power Reduction Register” on page 40, provides a method
to stop the clock to individual peripherals to reduce power consumption. The current state of the peripheral is frozen and the
I/O registers can not be read or written. Resources used by the peripheral when stopping the clock will remain occupied,
hence the peripheral should in most cases be disabled before stopping the clock. Waking up a module, which is done by
clearing the bit in PRR, puts the module in the same state as before shutdown.
Module shutdown can be used in idle mode and active mode to significantly reduce the overall power consumption. In all
other sleep modes, the clock is already stopped.
10.10 Minimizing Power Consumption
There are several possibilities to consider when trying to minimize the power consumption in an AVR controlled system. In
general, sleep modes should be used as much as possible, and the sleep mode should be selected so that as few as
possible of the device’s functions are operating. All functions not needed should be disabled. In particular, the following
modules may need special consideration when trying to achieve the lowest possible power consumption.
10.10.1 Analog to Digital Converter
If enabled, the ADC will be enabled in all sleep modes. To save power, the ADC should be disabled before entering any
sleep mode. When the ADC is turned off and on again, the next conversion will be an extended conversion. Refer to Section
24. “Analog-to-Digital Converter” on page 213 for details on ADC operation.
10.10.2 Analog Comparator
When entering Idle mode, the analog comparator should be disabled if not used. When entering ADC noise reduction mode,
the analog comparator should be disabled. In other sleep modes, the analog comparator is automatically disabled. However,
if the analog comparator is set up to use the internal voltage reference as input, the analog comparator should be disabled in
all sleep modes. Otherwise, the internal voltage reference will be enabled, independent of sleep mode. Refer to
Section 23. “Analog Comparator” on page 210 for details on how to configure the analog comparator.
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