ATMEGA8HVD-4MX Atmel, ATMEGA8HVD-4MX Datasheet - Page 32

• Manufacturer Part Number: ATMEGA8HVD-4MX
• Description: MCU AVR 8K FLASH 2.1-8V 4MHZ QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA8HVD-4MX

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 4MHz
• Peripherals: POR, WDT
• Number Of I /o: 5
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 2.4 V
• Data Converters: A/D 1x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 18-MLF® Exposed Pad (Staggered Leads), DFN
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32ATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Connectivity: -

9. Power Management and Sleep Modes
9.1
32
Sleep Modes
ATmega4HVD/8HVD
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 22
their distribution. The figure is helpful in selecting an appropriate sleep mode. The different
sleep modes and their wake-up sources are summarized in
33
Table 9-1.
Note:
To enter any of the available sleep modes, the SE bit in SMCR must be written to logic one
and a SLEEP instruction must be executed. The SM2:0 bits in the SMCR Register select
which sleep mode (Idle, ADC NRM, Power-save or Power-off) will be activated 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 any sleep mode. If a reset occurs during
sleep mode, the MCU wakes up and executes from the Reset Vector.
Mode
Idle
ADC Noise Reduction
Power-save
Power-off
shows a sleep mode state diagram.
1. Discharge FET must be switched off for Charger Detect to be active.
Wake-up Sources for Sleep Modes
Table 9-3 on page 36
presents the different clock systems in the ATmega4HVD/8HVD, and
for a summary.
X
X
X
X
X
X
X
X
X
Wake-up sources
Table
X
X
9-1, and
X
X
Figure 9-1 on page
X
X
8052B–AVR–09/08
X
X