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ATMEGA8-16PU Scheda tecnica(PDF) 33 Page - ATMEL Corporation |
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ATMEGA8-16PU Scheda tecnica(HTML) 33 Page - ATMEL Corporation |
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33 / 308 page  33 2486T–AVR–05/08 ATmega8(L) 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 consump- tion to the application’s requirements. To enter any of the five sleep modes, the SE bit in MCUCR must be written to logic one and a SLEEP instruction must be executed. The SM2, SM1, and SM0 bits in the MCUCR Register select which sleep mode (Idle, ADC Noise Reduction, Power-down, Power-save, or Standby) will be activated by the SLEEP instruction. See Table 13 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, it 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. Note that the Extended Standby mode present in many other AVR MCUs has been removed in the ATmega8, as the TOSC and XTAL inputs share the same physical pins. Figure 10 on page 25 presents the different clock systems in the ATmega8, and their distribu- tion. The figure is helpful in selecting an appropriate sleep mode. MCU Control Register – MCUCR The MCU Control Register contains control bits for power management. • Bit 7 – SE: Sleep Enable The SE bit must be written to logic one to make the MCU enter the sleep mode when the SLEEP instruction is executed. To avoid the MCU entering the sleep mode unless it is the programmer’s purpose, it is recommended to set the Sleep Enable (SE) bit just before the execution of the SLEEP instruction. • Bits 6..4 – SM2..0: Sleep Mode Select Bits 2, 1, and 0 These bits select between the five available sleep modes as shown in Table 13. Note: 1. Standby mode is only available with external crystals or resonators. Bit 765 4321 0 SE SM2 SM1 SM0 ISC11 ISC10 ISC01 ISC00 MCUCR Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 000 0000 0 Table 13. Sleep Mode Select SM2 SM1 SM0 Sleep Mode 000 Idle 0 0 1 ADC Noise Reduction 010 Power-down 011 Power-save 100 Reserved 101 Reserved 110 Standby(1) |
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