ATMEGA16-16AU SL383 Atmel, ATMEGA16-16AU SL383 Datasheet - Page 40

• Manufacturer Part Number: ATMEGA16-16AU SL383
• Description: IC MCU 8BIT 16KB FLASH 44TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA16-16AU SL383

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

External Reset
Brown-out Detection
2466T–AVR–07/10
An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the
minimum pulse width (see
Shorter pulses are not guaranteed to generate a reset. When the applied signal reaches the
Reset Threshold Voltage – V
the Time-out period t
Figure 18. External Reset During Operation
ATmega16 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
ing operation by comparing it to a fixed trigger level. The trigger level for the BOD can be
selected by the fuse BODLEVEL to be 2.7V (BODLEVEL unprogrammed), or 4.0V (BODLEVEL
programmed). 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
The BOD circuit can be enabled/disabled by the fuse BODEN. When the BOD is enabled
(BODEN programmed), and V
19), the Brown-out Reset is immediately activated. When V
(V
expired.
The BOD circuit will only detect a drop in V
ger than t
Figure 19. Brown-out Reset During Operation
BOT
BOT+
- V
in
HYST
BOD
Figure
/2.
given in
CC
INTERNAL
TIME-OUT
19), the delay counter starts the MCU after the Time-out period t
RESET
RESET
TOUT
V
Table
CC
has expired.
15.
Table
RST
CC
– on its positive edge, the delay counter starts the MCU after
decreases to a value below the trigger level (V
15) will generate a reset, even if the clock is not running.
V
BOT-
CC
if the voltage stays below the trigger level for lon-
CC
V
BOT+
t
TOUT
BOT+
increases above the trigger level
= V
BOT
ATmega16(L)
+ V
HYST
/2 and V
BOT-
CC
level dur-
TOUT
in
Figure
BOT-
has
40
=