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ATmega324P Scheda tecnica(PDF) 46 Page - ATMEL Corporation

Il numero della parte ATmega324P
Spiegazioni elettronici  8-bit Microcontroller with 16/32/64K Bytes In-System Programmable Flash
PDF  377 Pages
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Produttore elettronici  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega324P Scheda tecnica(HTML) 46 Page - ATMEL Corporation

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46
7674F–AVR–09/09
ATmega164P/324P/644P
8.12
Register Description
8.12.1
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 8-2.
Note:
1. Standby modes are only recommended for use with external crystals or resonators.
• Bit 0 – 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 waking up.
Bit
7
6
543210
0x33 (0x53)
––
––
SM2
SM1
SM0
SE
SMCR
Read/Write
RRRR
R/W
R/W
R/W
R/W
Initial Value
0
0
000000
Table 8-2.
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)
1
1
1
Extended Standby(1)



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