ATMEGA32U2-AUR Atmel, ATMEGA32U2-AUR Datasheet - Page 42
ATMEGA32U2-AUR
Manufacturer Part Number
ATMEGA32U2-AUR
Description
MCU AVR 32K FLASH 16MHZ 32TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA32U2-AUR
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
22
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-TQFP, 32-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
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9. Power Management and Sleep Modes
9.1
9.2
9.3
7799D–AVR–11/10
Overview
Sleep Modes
Idle Mode
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.
Figure 8-1 on page 26
their distribution. The figure is helpful in selecting an appropriate sleep mode. shows the differ-
ent sleep modes and their wake up sources.
Table 9-1.
Notes:
To enter any of the five 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 (Idle, Power-down, Power-save, Standby or Extended standby) will be acti-
vated by the SLEEP instruction. See
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.
When the SM2:0 bits are written to 000, the SLEEP instruction makes the MCU enter Idle mode,
stopping the CPU but allowing the USB, SPI, USART, Analog Comparator, Timer/Counters,
Sleep Mode
Idle
Power-down
Power-save
Standby
Extended
Standby
1. Only recommended with external crystal or resonator selected as clock source.
2. For INT[7:4], only level interrupt.
3. Asynchronous USB interrupt is WAKEUPI only.
(1)
Active Clock Domains and Wake-up Sources in the Different Sleep Modes.
Active Clock
Domains
presents the different clock systems in the ATmega8U2/16U2/32U2, and
X
Table 9-2
Oscillators
X
X
X
for a summary.
ATmega8U2/16U2/32U2
X
X
X
X
X
(2)
(2)
(2)
(2)
X
Wake-up Sources
X
X
X
X
X
X
X
X
X
X
X
X
42
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