ATmega128A Atmel Corporation, ATmega128A Datasheet - Page 46

• Manufacturer Part Number: ATmega128A
• Manufacturer: Atmel Corporation

Specifications of ATmega128A

• Flash (kbytes): 128 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 53
• Ext Interrupts: 8
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 4
• Eeprom (bytes): 4096
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 8
• Input Capture Channels: 2
• Pwm Channels: 7
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

9. Power Management and Sleep Modes
9.1
9.2
8151H–AVR–02/11
Overview
Sleep modes
Sleep modes enable the application to shut down unused modules in the MCU, thereby saving
power. The Atmel
sumption to the application’s requirements.
Figure 8-1 on page 37
bution. The figure is helpful in selecting an appropriate sleep mode.
different sleep modes and their wake-up sources.
Table 9-1.
Notes:
To enter any of the six sleep modes, the SE bit in MCUCR must be written to logic one and a
SLEEP instruction must be executed. The SM2, SM1, and SM0 bits in the MCUCR Register
select which sleep mode (Idle, ADC Noise Reduction, Power-down, Power-save, Standby, or
Extended Standby) 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, it 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.
SleepMode
Idle
ADC Noise Reduction
Power-down
Power-save
Standby
Extended Standby
1. External Crystal or resonator selected as clock source
2. If AS
3. Only INT3:0 or level interrupt INT7:4
(1)
Active Clock Domains and Wake Up Sources in the Different Sleep Modes
0
®
bit in ASSR is set
(1)
AVR
presents the different clock systems in the ATmega128A, and their distri-
®
provides various sleep modes allowing the user to tailor the power con-
Active Clock Domains
X
X
X
X
X
X
X
(2)
(2)
Oscillators
X
X
X
X
X
X
X
X
(2)
(2)
(2)
(2)
X
X
X
X
X
X
(3)
(3)
(3)
(3)
(3)
Table 9-2
ATmega128A
Wake Up Sources
X
X
X
X
X
X
Table 9-1
X
X
X
X
(2)
(2)
for a summary.
X
X
shows the
X
X
X
46