ATMEGA16U2-16AU Atmel, ATMEGA16U2-16AU Datasheet - Page 50

• Manufacturer Part Number: ATMEGA16U2-16AU
• Description: 8-bit Microcontrollers - MCU 16K Flash
• Manufacturer: Atmel

Specifications of ATMEGA16U2-16AU

• Product Category: 8-bit Microcontrollers - MCU
• Rohs: yes
• Core: AVR
• Data Bus Width: 8 bit
• Program Memory Size: 16 KB
• Data Ram Size: 1.25 KB
• Data Rom Size: 512 B
• Program Memory Type: Flash
• Factory Pack Quantity: 1250

10.2.3
10.2.4
10.2.5
7799D–AVR–11/10
Brown-out Detection
Watchdog Reset
USB Reset
ATmega8U2/16U2/32U2 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
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
“Watchdog Timer” on page 51
Figure 10-6. Watchdog Reset During Operation
When the USB macro is enabled and configured with the USB reset MCU feature enabled, and
if a valid USB Reset signalling is detected, the microcontroller is reset unless the USB macro
CC
BOT
level during operation by comparing it to a fixed trigger level. The trigger level for the BOD
+ V
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
for details on operation of the Watchdog Timer.
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-
ATmega8U2/16U2/32U2
BOT+
in
V
t
TOUT
BOT+
Figure
267.
10-5), the delay counter
CC
decreases to a
TOUT
. Refer to
BOT+
50
=