ATMEGA8515-16AI Atmel, ATMEGA8515-16AI Datasheet - Page 48

• Manufacturer Part Number: ATMEGA8515-16AI
• Description: IC AVR MCU 8K 16MHZ IND 44-TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA8515-16AI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: EBI/EMI, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 35
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -

External Reset
Brown-out Detection
48
ATmega8515(L)
An External Reset is generated by a low level on the RESET pin. Reset pulses longer
than the minimum pulse width (see Table 18) will generate a 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
counter starts the MCU after the Time-out period t
Figure 25. External Reset During Operation
ATmega8515 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
level during 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
The BOD circuit can be enabled/disabled by the fuse BODEN. When the BOD is
enabled (BODEN programmed), and V
(V
above the trigger level (V
time-out period t
The BOD circuit will only detect a drop in V
for longer than t
Figure 26. Brown-out Reset During Operation
BOT+
BOT-
INTERNAL
TIME-OUT
RESET
RESET
= V
in Figure 26), the Brown-out Reset is immediately activated. When V
CC
V
BOT
CC
+ V
BOD
TOUT
HYST
given in Table 18.
/2 and V
has expired.
BOT+
BOT-
in Figure 26), the delay counter starts the MCU after the
V
BOT-
= V
BOT
CC
- V
decreases to a value below the trigger level
CC
HYST
if the voltage stays below the trigger level
/2.
TOUT
RST
– on its positive edge, the delay
has expired.
V
t
TOUT
BOT+
2512K–AVR–01/10
CC
increases
CC