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ATMEGA329P Folha de dados(PDF) 36 Page - ATMEL Corporation |
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ATMEGA329P Folha de dados(HTML) 36 Page - ATMEL Corporation |
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36 / 385 page  36 8021E–AVR–07/09 ATmega329P/3290P 9. Power Management and Sleep Modes Sleep modes enable the application to shut down unused modules in the MCU, thereby saving- power. The AVR provides various sleep modes allowing the user to tailor the power consumption to the application’s requirements. When enabled, the Brown-out Detector (BOD) actively monitors the power supply voltage during the sleep periods. To further save power, it is possible to disable the BOD in some sleep modes. See ”BOD Disable” on page 37 for more details. 9.1 Sleep Modes Figure 8-1 on page 27 presents the different clock systems in the ATmega329P/3290P, and their distribution. The figure is helpful in selecting an appropriate sleep mode. Table 9-1 shows the different sleep modes, their wake up sources and BOD disable ability. Notes: 1. Only recommended with external crystal or resonator selected as clock source. 2. If either LCD controller or Timer/Counter2 is running in asynchronous mode. 3. For INT0, only level interrupt. To enter any of the sleep modes, the SE bit in SMCR must be written to logic one and a SLEEP instruction must be executed. The SM2, SM1, and SM0 bits in the SMCR Register select which sleep mode will be activated by the SLEEP instruction. See Table 9-2 on page 41 for a summary. If an enabled interrupt occurs while the MCU is in a sleep mode, the MCU wakes up. The MCU is then halted for four cycles in addition to the start-up time, executes the interrupt routine, and resumes execution from the instruction following SLEEP. The contents of the Register File and SRAM are unaltered when the device wakes up from sleep. If a reset occurs during sleep mode, the MCU wakes up and executes from the Reset Vector. Table 9-1. Active Clock Domains and Wake-up Sources in the Different Sleep Modes. Active Clock Domains Oscillators Wake-up Sources Sleep Mode Idle XXX X X(2) XXX XXX X ADCNRM X X X X(2) X(3) XX(2) XXX Power-down X(3) XX X Power-save X X(2) X(3) XX X X Standby(1) XX(3) XX X |
Nº de peça semelhante - ATMEGA329P_1 |
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Descrição semelhante - ATMEGA329P_1 |
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