ATMEGA8L-8AUR Atmel, ATMEGA8L-8AUR Datasheet - Page 40
ATMEGA8L-8AUR
Manufacturer Part Number
ATMEGA8L-8AUR
Description
MCU AVR 8KB FLASH 8MHZ 32TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA8L-8MU.pdf
(302 pages)
Specifications of ATMEGA8L-8AUR
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
23
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K 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
*
Package
32TQFP
Device Core
AVR
Family Name
ATmega
Maximum Speed
8 MHz
Operating Supply Voltage
3.3|5 V
Data Bus Width
8 Bit
Number Of Programmable I/os
23
Interface Type
SPI/TWI/USART
On-chip Adc
8-chx10-bit
Number Of Timers
3
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA8L-8AUR
Manufacturer:
Atmel
Quantity:
3 915
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External Reset
Brown-out Detection
40
ATmega8(L)
An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the
minimum pulse width (see
running. Shorter pulses are not guaranteed to generate a reset. When the applied signal
reaches the Reset Threshold Voltage – V
MCU after the time-out period t
Figure 17. External Reset During Operation
ATmega8 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
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 pro-
grammed). 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
18), 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 18. Brown-out Reset During Operation
BOT+
BOT+
= V
in
BOD
BOT
Figure
CC
+ V
given in
INTERNAL
TIME-OUT
HYST
18), the delay counter starts the MCU after the time-out period t
RESET
RESET
V
CC
/2 and V
Table 15 on page
Table 15 on page
BOT-
CC
TOUT
decreases to a value below the trigger level (V
= V
has expired.
BOT
V
BOT-
38.
- V
RST
CC
HYST
if the voltage stays below the trigger level for lon-
38) will generate a reset, even if the clock is not
on its positive edge, the delay counter starts the
/2.
CC
V
t
TOUT
BOT+
increases above the trigger level
CC
BOT-
2486Z–AVR–02/11
level during
TOUT
in
Figure
has
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