ATmega32M1 Atmel Corporation, ATmega32M1 Datasheet - Page 44

• Manufacturer Part Number: ATmega32M1
• Manufacturer: Atmel Corporation

Specifications of ATmega32M1

• Flash (kbytes): 32 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 27
• Ext Interrupts: 27
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 1
• Can: 1
• Lin: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 125
• Analog Comparators: 4
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 2
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 14
• Input Capture Channels: 1
• Pwm Channels: 10
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

10.2.2
10.2.3
44
ATmega16M1/32M1/64M1
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
Figure 10-4. External Reset During Operation
ATmega16M1/32M1/64M1 has an On-chip Brown-out Detection (BOD) circuit for monitoring the
V
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
When the BOD is enabled, and V
10-5 on page
trigger level (V
out period t
The BOD circuit will only detect a drop in V
ger than t
CC
BOT+
level during operation by comparing it to a fixed trigger level. The trigger level for the BOD
= V
INTERNAL
TIME-OUT
BOD
BOT
TOUT
RESET
RESET
+ V
given in
45), the Brown-out Reset is immediately activated. When V
V
BOT+
CC
CC
has expired.
HYST
in
/2 and V
Figure 10-5 on page
“System and Reset Characteristics” on page
“System and Reset Characteristics” on page
BOT-
V
POT
CC
= V
decreases to a value below the trigger level (V
BOT
- V
45), the delay counter starts the MCU after the Time-
CC
HYST
if the voltage stays below the trigger level for lon-
/2.
V
RST
t
TOUT
TOUT
– has expired.
RST
311.
– on its positive edge, the
CC
311) will generate a
increases above the
8209D–AVR–11/10
BOT-
in
Figure