ATMEGA323-8PI Atmel, ATMEGA323-8PI Datasheet - Page 28
ATMEGA323-8PI
Manufacturer Part Number
ATMEGA323-8PI
Description
IC AVR MCU 32K 8MHZ IND 40DIP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA323L-4PC.pdf
(247 pages)
Specifications of ATMEGA323-8PI
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
40-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
ATMEGA3238PI
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Power-on Reset
28
ATmega323(L)
Table 6 shows the start-up times from Reset. When the CPU wakes up from Power-
down or Power-save, only the clock counting part of the start-up time is used. The
Watchdog Oscillator is used for timing the Real Time part of the start-up time. The num-
ber WDT Oscillator cycles used for each time-out is shown in Table 7.
The frequency of the Watchdog Oscillator is voltage dependent as shown in the Electri-
cal Characteristics section. The device is shipped with CKSEL = “0010” (Internal RC
Oscillator, slowly rising power).
Table 7. Number of Watchdog Oscillator Cycles
Note:
A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detec-
tion level is defined in Table 5. The POR is activated whenever V
detection level. The POR circuit can be used to trigger the Start-up Reset, as well as to
detect a failure in supply voltage.
A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reach-
ing the Power-on Reset threshold voltage invokes a delay counter, which determines
the delay, for which the device is kept in RESET after V
the delay counter can be defined by the user through the CKSEL Fuses. The different
selections for the delay period are presented in Table 6. The RESET signal is activated
again, without any delay, when the V
Figure 25. MCU Start-up, RESET Tied to V
INTERNAL
BODLEVEL
Unprogrammed
Unprogrammed
Unprogrammed
Unprogrammed
Programmed
Programmed
Programmed
Programmed
TIME-OUT
RESET
RESET
VCC
1. The BODLEVEL Fuse can be used to select start-up times even if the Brown-out
Detection is disabled (BODEN Fuse unprogrammed).
(1)
V
V
POT
RST
V
CC
t
TOUT
Condition
2.7V
2.7V
2.7V
2.7V
4.0V
4.0V
4.0V
4.0V
CC
decreases below detection level.
CC
Time-out
130 µs
4.2 ms
5.8 ms
67 ms
92 ms
30 µs
10 µs
35 µs
CC
rise. The time-out period of
Number of Cycles
CC
16K
64K
32
1K
32
4K
8
8
1457G–AVR–09/03
is below the
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