ATmega3290P Atmel Corporation, ATmega3290P Datasheet - Page 47

• Manufacturer Part Number: ATmega3290P
• Manufacturer: Atmel Corporation

Specifications of ATmega3290P

• Flash (kbytes): 32 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 20 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 69
• Ext Interrupts: 32
• Usb Speed: No
• Usb Interface: No
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Segment Lcd: 160
• 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): 2
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

10.2.3
10.2.4
8021G–AVR–03/11
Brown-out Detection
Watchdog Reset
ATmega329P/3290P has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
level during operation by comparing it to a fixed trigger level. 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
V
value below the trigger level (V
vated. When V
starts the MCU after the Time-out period t
The BOD circuit will only detect a drop in V
ger than t
Figure 10-5. Brown-out Reset During Operation
When the Watchdog times out, it will generate a short reset pulse of one CK cycle duration. On
the falling edge of this pulse, the delay timer starts counting the Time-out period t
page 48
Figure 10-6. Watchdog Reset During Operation
BOT
+ V
for details on operation of the Watchdog Timer.
HYST
BOD
CC
/2 and V
given in
INTERNAL
TIME-OUT
CC
RESET
RESET
increases above the trigger level (V
V
CC
BOT-
”System and Reset Characteristics” on page
= V
BOT
BOT-
- V
HYST
in
V
CK
BOT-
Figure
/2.When the BOD is enabled, and V
TOUT
CC
if the voltage stays below the trigger level for lon-
has expired.
10-5), the Brown-out Reset is immediately acti-
BOT+
ATmega329P/3290P
in
V
t
TOUT
BOT+
Figure
336.
10-5), the delay counter
CC
decreases to a
TOUT
. Refer to
BOT+
47
CC
=