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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： | 45/114页 |
| 文件大小： | 1357K |
| 代理商： | MB9AF314NBGL |
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ATmega48PA/88PA/168PA [DATASHEET]
9223F–AVR–04/14
36
10.2
BOD Disable(1)
When the brown-out detector (BOD) is enabled by BODLEVEL fuses - see Table 28-6 on page 253 and onwards, the BOD is
actively monitoring the power supply voltage during a sleep period. To save power, it is possible to disable the BOD by
software for some of the sleep modes, see Table 10-1 on page 35. The sleep mode power consumption will then be at the
same level as when BOD is globally disabled by fuses. If BOD is disabled in software, the BOD function is turned off
immediately after entering the sleep mode. Upon wake-up from sleep, BOD is automatically enabled again. This ensures
safe operation in case the VCC level has dropped during the sleep period.
When the BOD has been disabled, the wake-up time from sleep mode will be approximately 60 s to ensure that the BOD is
working correctly before the MCU continues executing code.
BOD disable is controlled by bit 6, BODS (BOD Sleep) in the control register MCUCR, see
Section 10.11.2 “MCUCR – MCU Control Register” on page 39. Writing this bit to one turns off the BOD in relevant sleep
modes, while a zero in this bit keeps BOD active. Default setting keeps BOD active, i.e. BODS set to zero.
Writing to the BODS bit is controlled by a timed sequence and an enable bit, see
Note:
1.
BOD disable only available in picoPower devices ATmega48PA/88PA/168PA
10.3
Idle Mode
When the SM2...0 bits are written to 000, the SLEEP instruction makes the MCU enter Idle mode, stopping the CPU but
allowing the SPI, USART, analog comparator, ADC, 2-wire serial interface, Timer/Counters, watchdog, and the interrupt
system to continue operating. This sleep mode basically halts clkCPU and clkFLASH, while allowing the other clocks to run.
Idle mode enables the MCU to wake up from external triggered interrupts as well as internal ones like the timer overflow and
USART transmit complete interrupts. If wake-up from the analog comparator interrupt is not required, the analog comparator
can be powered down by setting the ACD bit in the analog comparator control and status register – ACSR. This will reduce
power consumption in Idle mode. If the ADC is enabled, a conversion starts automatically when this mode is entered.
10.4
ADC Noise Reduction Mode
When the SM2...0 bits are written to 001, the SLEEP instruction makes the MCU enter ADC noise reduction mode, stopping
the CPU but allowing the ADC, the external interrupts, the 2-wire serial interface address watch, Timer/Counter2(1), and the
watchdog to continue operating (if enabled). This sleep mode basically halts clkI/O, clkCPU, and clkFLASH, while allowing the
other clocks to run.
This improves the noise environment for the ADC, enabling higher resolution measurements. If the ADC is enabled, a
conversion starts automatically when this mode is entered. Apart from the ADC conversion complete interrupt, only an
external reset, a watchdog system reset, a watchdog interrupt, a brown-out reset, a 2-wire serial interface address match, a
Timer/Counter2 interrupt, an SPM/EEPROM ready interrupt, an external level interrupt on INT0 or INT1 or a pin change
interrupt can wake up the MCU from ADC noise reduction mode.
Notes: 1.
Timer/Counter2 will only keep running in asynchronous mode, see
10.5
Power-down Mode
When the SM2...0 bits are written to 010, the SLEEP instruction makes the MCU enter power-down mode. In this mode, the
external oscillator is stopped, while the external interrupts, the 2-wire serial interface address watch, and the watchdog
continue operating (if enabled). Only an external reset, a watchdog system reset, a watchdog interrupt, a brown-out reset, a
2-wire serial interface address match, an external level interrupt on INT0 or INT1, or a pin change interrupt can wake up the
MCU. This sleep mode basically halts all generated clocks, allowing operation of asynchronous modules only.
Note:
If a level triggered interrupt is used for wake-up from power-down, the required level must be held long enough
for the MCU to complete the wake-up to trigger the level interrupt. If the level disappears before the end of the
start-up time, the MCU will still wake up, but no interrupt will be generated.
Section 13. “External Interrupts” on page 59. The start-up time is defined by the SUT and CKSEL Fuses as
described in Section 9. “System Clock and Clock Options” on page 24.
When waking up from power-down mode, there is a delay from the wake-up condition occurs until the wake-up becomes
effective. This allows the clock to restart and become stable after having been stopped. The wake-up period is defined by the
same CKSEL fuses that define the reset time-out period, as described in Section 9.2 “Clock Sources” on page 25.
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