ATMEGA8535L-8JUR Atmel, ATMEGA8535L-8JUR Datasheet - Page 39

• Manufacturer Part Number: ATMEGA8535L-8JUR
• Description: MCU AVR 8K FLASH 8MHZ 44PLCC
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA8535L-8JUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• 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): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

External Reset
Brown-out Detection
2502K–AVR–10/06
An External Reset is generated by a low level on the RESET pin. Reset pulses longer
than the minimum pulse width (see Table 15) 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 18. External Reset During Operation
ATmega8535 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 19. Brown-out Reset During Operation
BOT+
BOT-
= V
in Figure 19), the Brown-out Reset is immediately activated. When V
CC
BOT
INTERNAL
TIME-OUT
+ V
RESET
RESET
V
BOD
TOUT
CC
HYST
given in Table 15.
/2 and V
has expired.
BOT+
BOT-
in Figure 19), the delay counter starts the MCU after the
= V
V
BOT-
BOT
CC
- V
decreases to a value below the trigger level
CC
HYST
if the voltage stays below the trigger level
/2.
TOUT
RST
has expired.
on its positive edge, the delay
ATmega8535(L)
V
t
TOUT
BOT+
CC
increases
39
CC