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ATMEGA649 Datasheet(PDF) 38 Page - ATMEL Corporation |
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ATMEGA649 Datasheet(HTML) 38 Page - ATMEL Corporation |
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38 / 375 page  38 ATmega329/3290/649/6490 2552H–AVR–11/06 Register Description SMCR – Sleep Mode Control Register The Sleep Mode Control Register contains control bits for power management. • Bits 3, 2, 1 – SM2:0: Sleep Mode Select Bits 2, 1, and 0 These bits select between the five available sleep modes as shown in Table 15. Note: 1. Standby mode is only recommended for use with external crystals or resonators. • Bit 1 – 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 write the Sleep Enable (SE) bit to one just before the execution of the SLEEP instruction and to clear it immediately after wak- ing up. PRR – Power Reduction Register • Bits 7, 6, 5 - Res: Reserved bits These bits are reserved bits in ATmega329/3290/649/6490 and will always read as zero. • Bit 4 - PRLCD: Power Reduction LCD Writing logic one to this bit shuts down the LCD controller. The LCD controller must be disabled and the display discharged before shut down. See "Disabling the LCD" on page 217 for details on how to disable the LCD controller. • Bit 3 - PRTIM1: Power Reduction Timer/Counter1 Writing logic one to this bit shuts down the Timer/Counter1 module. When Timer/Counter1 is enabled, operation will continue like before the shutdown. • Bit 2 - PRSPI: Power Reduction Serial Peripheral Interface Bit 7654 321 0 0x33 (0x53) – – – – SM2 SM1 SM0 SE SMCR Read/Write R R R R R/W R/W R/W R/W Initial Value 0000 000 0 Table 15. 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) 111 Reserved Bit 7 6 5 4 3 210 (0x64) – – – PRLCD PRTIM1 PRSPI PRUSART0 PRADC PRR Read/Write R R R R/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 |
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