參數(shù)資料
型號(hào): MD80C52CXXX-12P883
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 12 MHz, MICROCONTROLLER, CDIP40
封裝: 0.600 INCH, CERAMIC, DIP-40
文件頁(yè)數(shù): 226/287頁(yè)
文件大小: 12910K
代理商: MD80C52CXXX-12P883
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43
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
10.3
BOD disable(1)
When the Brown-out Detector (BOD) is enabled by BODLEVEL fuses, Table 27-3 on page 299,
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
42. 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 V
CC 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
”MCUCR – MCU Control Register” on page 48. Writing this bit to one turns off the BOD in rele-
vant sleep modes, while a zero in this bit keeps BOD active. Default setting keeps BOD active,
that is, BODS set to zero.
Writing to the BODS bit is controlled by a timed sequence and an enable bit, see ”MCUCR –
Note:
1. Only available in the Atmel ATmega164PA/324PA/644PA/1284P.
10.4
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, two-wire
Serial Interface, Timer/Counters, Watchdog, and the interrupt system to continue operating. This
sleep mode basically halts clk
CPU 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 automati-
cally when this mode is entered.
10.5
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, two-wire
Serial Interface address match, Timer/Counter2 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 form the
ADC Conversion Complete interrupt, only an External Reset, a Watchdog System Reset, a
Watchdog interrupt, a Brown-out Reset, a two-wire serial interface interrupt, a Timer/Counter2
interrupt, an SPM/EEPROM ready interrupt, an external level interrupt on INT7:4 or a pin
change interrupt can wakeup the MCU from ADC Noise Reduction mode.
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