ATmega6490P Atmel Corporation, ATmega6490P Datasheet - Page 50

• Manufacturer Part Number: ATmega6490P
• Manufacturer: Atmel Corporation

Specifications of ATmega6490P

• Flash (kbytes): 64 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): 4
• Eeprom (bytes): 2048
• 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

11.2.3
11.2.4
8284D–AVR–6/11
Brown-out Detection
Watchdog Reset
ATmega169A/PA/329A/PA/3290A/PA/649A/P/6490A/P
ATmega169A/169PA/329A/329PA/3290A/3290PA/649A/649P/6490A/6490P has an On-chip
Brown-out Detection (BOD) circuit for monitoring the V
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
in
trigger level (V
t
The BOD circuit will only detect a drop in V
ger than t
Figure 11-5. 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
”Watchdog Timer” on page 51
Figure 11-6. Watchdog Reset During Operation
TOUT
HYST
Figure
has expired.
/2.When the BOD is enabled, and V
BOD
11-5), the Brown-out Reset is immediately activated. When V
CC
given in
BOT+
INTERNAL
TIME-OUT
RESET
RESET
in
V
CC
”System and Reset Characteristics” on page
Figure
11-5), the delay counter starts the MCU after the Time-out period
for details on operation of the Watchdog Timer.
V
CK
BOT-
CC
CC
decreases to a value below the trigger level (V
if the voltage stays below the trigger level for lon-
BOT+
CC
= V
level during operation by comparing it
BOT
V
t
TOUT
BOT+
+ V
353.
HYST
CC
/2 and V
increases above the
BOT-
TOUT
. Refer to
= V
BOT
BOT-
50
-