ATMEGA8A-MUR Atmel, ATMEGA8A-MUR Datasheet - Page 38

• Manufacturer Part Number: ATMEGA8A-MUR
• Description: MCU AVR 8KB FLASH 16MHZ 32QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA8A-MUR

• 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: 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: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10.2.1
8159D–AVR–02/11
Power-on Reset
Figure 10-1. Reset Logic
A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level
is defined in
level. The POR circuit can be used to trigger the Start-up Reset, as well as to detect a failure in
supply voltage.
A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reaching the
Power-on Reset threshold voltage invokes the delay counter, which determines how long the
device is kept in RESET after V
when V
Figure 10-2. MCU Start-up, RESET Tied to V
INTERNAL
TIME-OUT
CC
RESET
RESET
V
decreases below the detection level.
BODLEVEL
CC
Table 25-3 on page
BODEN
Pull-up Resistor
FILTER
SPIKE
V
V
POT
RST
CKSEL[3:0]
CC
247. The POR is activated whenever V
t
Reset Circuit
SUT[1:0]
TOUT
Brown-Out
Watchdog
Oscillator
Generator
rise. The RESET signal is activated again, without any delay,
Clock
CK
MCU Control and Status
CC
Register (MCUCSR)
DATA BUS
Delay Counters
TIMEOUT
CC
is below the detection
ATmega8A
38