ATmega8 Atmel Corporation, ATmega8 Datasheet - Page 38

• Manufacturer Part Number: ATmega8
• Manufacturer: Atmel Corporation

Specifications of ATmega8

• Flash (kbytes): 8 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 23
• Ext Interrupts: 2
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 1
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 3
• Input Capture Channels: 1
• Pwm Channels: 3
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

38
ATmega8(L)
Figure 14. Reset Logic
Table 15. Reset Characteristics
Notes:
Symbol
V
V
V
V
t
t
BOD
RST
HYST
POT
RST
BOT
1. The Power-on Reset will not work unless the supply voltage has been below V
2. V
BODLEVEL
this is the case, the device is tested down to V
antees that a Brown-out Reset will occur before V
operation of the microcontroller is no longer guaranteed. The test is performed using
BODLEVEL = 1 for ATmega8L and BODLEVEL = 0 for ATmega8. BODLEVEL = 1 is not appli-
cable for ATmega8
Parameter
Power-on Reset Threshold
Voltage (rising)
Power-on Reset Threshold
Voltage (falling)
RESET Pin Threshold Voltage
Minimum pulse width on
RESET Pin
Brown-out Reset Threshold
Voltage
Minimum low voltage period for
Brown-out Detection
Brown-out Detector hysteresis
BODEN
BOT
may be below nominal minimum operating voltage for some devices. For devices where
(2)
Pull-up Resistor
FILTER
SPIKE
(1)
CKSEL[3:0]
Reset Circuit
SUT[1:0]
Brown-Out
Watchdog
Oscillator
Generator
Clock
BODLEVEL = 1
BODLEVEL = 0
BODLEVEL = 1
BODLEVEL = 0
Condition
CK
MCU Control and Status
Register (MCUCSR)
DATA BUS
CC
Delay Counters
= V
BOT
Min
0.2
2.4
3.7
CC
during the production test. This guar-
drops to a voltage where correct
Typ
130
1.4
1.3
2.6
4.0
2
2
TIMEOUT
Max
2.3
2.3
0.9
1.5
2.9
4.5
Units
POT
V
mV
2486Z–AVR–02/11
µs
µs
V
V
CC
(falling)