ATMEGA323-8AI Atmel, ATMEGA323-8AI Datasheet - Page 40
![IC AVR MCU 32K 8MHZ IND 44TQFP](/photos/6/70/67042/313-44-tqfp_sml.jpg)
ATMEGA323-8AI
Manufacturer Part Number
ATMEGA323-8AI
Description
IC AVR MCU 32K 8MHZ IND 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA323L-4PC.pdf
(247 pages)
Specifications of ATMEGA323-8AI
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
ATMEGA3238AI
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Power-down Mode
Power-save Mode
Standby Mode
Extended Standby Mode
40
ATmega323(L)
When the SM2..0 bits are 010, the SLEEP instruction makes the MCU enter Power-
down mode. In this mode, the external Oscillator is stopped, while the external inter-
rupts, the Two-wire Serial Interface address watch, and the Watchdog continue
operating (if enabled). Only an External Reset, a Watchdog Reset, an Two-wire Serial
Interface address match interrupt, an external level interrupt on INT0 or INT1, or an
external edge interrupt on INT2 can wake up the MCU.
Note that if a level triggered interrupt is used for wake-up from Power-down mode, the
changed level must be held for some time to wake up the MCU. This makes the MCU
less sensitive to noise. The changed level is sampled twice by the Watchdog Oscillator
clock, and if the input has the required level during this time, the MCU will wake up. The
period of the Watchdog Oscillator is 1 µs (nominal) at 5.0V and 25 C. The frequency of
the Watchdog Oscillator is voltage dependent as shown in the Electrical Characteristics
section.
When waking up from Power-down mode, there is a delay from the wake-up condition
occurs until the wake-up becomes effective. This allows the clock to restart and become
stable after having been stopped. The wake-up period is defined by the same CKSEL
Fuses that define the Reset Time-out Period, as seen in Table 6 on page 27.
When the SM2..0 bits are 011, the SLEEP instruction forces the MCU into the Power-
save mode. This mode is identical to Power-down, with one exception:
If Timer/Counter2 is clocked asynchronously, i.e., the AS2 bit in ASSR is set,
Timer/Counter2 will run during sleep. The device can wake up from either Timer Over-
f lo w o r Ou tp ut Co mp are e vent f r om Ti m er/ Cou nt er2 i f t he correspo ndi ng
Timer/Counter2 interrupt enable bits are set in TIMSK, and the Global Interrupt Enable
bit in SREG is set.
If the asynchronous timer is NOT clocked asynchronously, Power-down mode is recom-
mended instead of Power-save mode because the contents of the registers in the
asynchronous timer should be considered undefined after wake-up in Power-save mode
if AS2 is 0.
When the SM2..0 bits are 110 and an external crystal/resonator clock option is selected,
the SLEEP instruction forces the MCU into the Standby mode. This mode is identical to
Power-down with the exception that the Oscillator is kept running. From Standby mode,
the device wakes up in only six clock cycles.
When the SM2..0 bits are 111 and an external crystal/resonator clock option is selected,
the SLEEP instruction forces the MCU into the Extended Standby mode. This mode is
identical to Power-save mode with the exception that the Oscillator is kept running.
From Extended Standby mode, the device wakes up in only six clock cycles.
1457G–AVR–09/03
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