ATmega328P Automotive Atmel Corporation, ATmega328P Automotive Datasheet - Page 47

• Manufacturer Part Number: ATmega328P Automotive
• Manufacturer: Atmel Corporation

Specifications of ATmega328P Automotive

• Flash (kbytes): 32 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 23
• Ext Interrupts: 24
• Usb Speed: No
• Usb Interface: No
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• 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: Yes
• 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 125
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 6
• Input Capture Channels: 1
• Pwm Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

10.4
10.5
7810A–AVR–11/09
External Reset
Brown-out Detection
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
ATmega328P has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
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
ately activated. When V
the delay counter 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
BOT
+ V
HYST
BOD
CC
/2 and V
given in
INTERNAL
TIME-OUT
RESET
RESET
V
CC
BOT-
“System and Reset Characteristics” on page
CC
= V
increases above the trigger level (V
“System and Reset Characteristics” on page
BOT
BOT-
- V
in
HYST
Figure 10-5 on page
V
BOT-
/2.When the BOD is enabled, and V
CC
ATmega328P [Preliminary]
Table 27-7 on page
if the voltage stays below the trigger level for lon-
TOUT
47), the Brown-out Reset is immedi-
TOUT
V
t
– has expired. The External Reset
TOUT
BOT+
BOT+
has expired.
289.
RST
308.
in
– on its positive edge, the
Figure 10-5 on page
308) will generate a
CC
decreases to a
CC
BOT+
level
47),
47
=