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ATmega8A-AU Datasheet(PDF) 36 Page - ATMEL Corporation |
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ATmega8A-AU Datasheet(HTML) 36 Page - ATMEL Corporation |
36 / 307 page 36 8159C–AVR–07/09 ATmega8A 9.8 Register Description 9.8.1 MCUCR – MCU Control Register 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 9-2. Note: 1. Standby mode is only available with external crystals or resonators. Bit 7654 3210 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 0000 0000 Table 9-2. 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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