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ATMEGA32-16PU Datasheet(PDF) 34 Page - ATMEL Corporation |
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ATMEGA32-16PU Datasheet(HTML) 34 Page - ATMEL Corporation |
34 / 346 page 34 2503N–AVR–06/08 ATmega32(L) 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. 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 mode with the exception that the Oscillator is kept running. From Extended Standby mode, the device wakes up in six clock cycles.. Notes: 1. External Crystal or resonator selected as clock source. 2. If AS 2 bit in ASSR is set. 3. Only INT2 or level interrupt INT1 and INT0. Minimizing Power Consumption There are several issues 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. Analog to Digital Converter If enabled, the ADC will be enabled in all sleep modes. To save power, the ADC should be dis- abled before entering any sleep mode. When the ADC is turned off and on again, the next conversion will be an extended conversion. Refer to “Analog to Digital Converter” on page 201 for details on ADC operation. Table 14. Active Clock Domains and Wake Up Sources in the Different Sleep Modes Active Clock domains Oscillators Wake-up Sources Sleep Mode Idle X X X X X(2) X X X XXX ADC Noise Reduction XX X X(2) X(3) XX X X Power-down X(3) X Power-save X(2) X(2) X(3) XX(2) Standby(1) XX(3) X Extended Standby(1) X(2) XX(2) X(3) XX(2) |
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