ATMEGA328-MUR Atmel, ATMEGA328-MUR Datasheet - Page 49
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ATMEGA328-MUR
Manufacturer Part Number
ATMEGA328-MUR
Description
IC MCU AVR 32K FLASH 32QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA328-MUR
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
23
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)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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10.4
10.5
8271C–AVR–08/10
External Reset
Brown-out Detection
Figure 10-3. MCU Start-up, RESET Extended Externally
An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the
minimum pulse width (see
reset, even if the clock is not running. Shorter pulses are not guaranteed to generate a reset.
When the applied signal reaches the Reset Threshold Voltage – V
delay counter starts the MCU after the Time-out period – t
can be disabled by the RSTDISBL fuse, see
Figure 10-4. External Reset During Operation
ATmega48A/48PA/88A/88PA/168A/168PA/328/328P has an On-chip Brown-out Detection
(BOD) circuit for monitoring the V
The trigger level for the BOD can be selected by the BODLEVEL Fuses. The trigger level has a
hysteresis to ensure spike free Brown-out Detection. The hysteresis on the detection level
should be interpreted as V
enabled, and V
the Brown-out Reset is immediately activated. When V
(V
t
The BOD circuit will only detect a drop in V
ger than t
TOUT
ATmega48A/48PA/88A/88PA/168A/168PA/328/328
BOT+
INTERNAL
TIME-OUT
has expired.
in
RESET
RESET
BOD
Figure 10-5 on page
V
CC
CC
given in
CC
decreases to a value below the trigger level (V
”System and Reset Characteristics” on page
BOT+
V
”System and Reset Characteristics” on page
POT
50), the delay counter starts the MCU after the Time-out period
= V
CC
BOT
level during operation by comparing it to a fixed trigger level.
+ V
HYST
CC
Table 27-7 on page
if the voltage stays below the trigger level for lon-
V
/2 and V
RST
t
TOUT
BOT-
TOUT
CC
= V
increases above the trigger level
– has expired. The External Reset
BOT
BOT-
298.
RST
323.
- V
in
– on its positive edge, the
HYST
Figure 10-5 on page
323) will generate a
/2.When the BOD is
50),
49
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