ATMEGA8L ATMEL [ATMEL Corporation], ATMEGA8L Datasheet - Page 5
![no-image](/images/no-image-200.jpg)
ATMEGA8L
Manufacturer Part Number
ATMEGA8L
Description
8-bit AVR with 8K Bytes In-System Programmable Flash
Manufacturer
ATMEL [ATMEL Corporation]
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA8L-6AU
Manufacturer:
ATMEL
Quantity:
675
Company:
Part Number:
ATMEGA8L-8AI
Manufacturer:
MICROCHIP
Quantity:
1 292
Company:
Part Number:
ATMEGA8L-8AU
Manufacturer:
ATMEL
Quantity:
4 590
Company:
Part Number:
ATMEGA8L-8AU
Manufacturer:
Atmel
Quantity:
7 500
Company:
Part Number:
ATMEGA8L-8AU
Manufacturer:
ATMEL
Quantity:
591
Part Number:
ATMEGA8L-8AU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Pin Descriptions
VCC
GND
Port B (PB7..PB0)
XTAL1/XTAL2/TOSC1/
TOSC2
Port C (PC5..PC0)
PC6/RESET
Port D (PD7..PD0)
RESET
2486SS–AVR–08/07
Digital supply voltage.
Ground.
Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The
Port B output buffers have symmetrical drive characteristics with both high sink and source
capability. As inputs, Port B pins that are externally pulled low will source current if the pull-up
resistors are activated. The Port B pins are tri-stated when a reset condition becomes active,
even if the clock is not running.
Depending on the clock selection fuse settings, PB6 can be used as input to the inverting Oscil-
lator amplifier and input to the internal clock operating circuit.
Depending on the clock selection fuse settings, PB7 can be used as output from the inverting
Oscillator amplifier.
If the Internal Calibrated RC Oscillator is used as chip clock source, PB7..6 is used as TOSC2..1
input for the Asynchronous Timer/Counter2 if the AS2 bit in ASSR is set.
The various special features of Port B are elaborated in
58
Port C is an 7-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The
Port C output buffers have symmetrical drive characteristics with both high sink and source
capability. As inputs, Port C pins that are externally pulled low will source current if the pull-up
resistors are activated. The Port C pins are tri-stated when a reset condition becomes active,
even if the clock is not running.
If the RSTDISBL Fuse is programmed, PC6 is used as an I/O pin. Note that the electrical char-
acteristics of PC6 differ from those of the other pins of Port C.
If the RSTDISBL Fuse is unprogrammed, PC6 is used as a Reset input. A low level on this pin
for longer than the minimum pulse length will generate a Reset, even if the clock is not running.
The minimum pulse length is given in
generate a Reset.
The various special features of Port C are elaborated on
Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The
Port D output buffers have symmetrical drive characteristics with both high sink and source
capability. As inputs, Port D pins that are externally pulled low will source current if the pull-up
resistors are activated. The Port D pins are tri-stated when a reset condition becomes active,
even if the clock is not running.
Port D also serves the functions of various special features of the ATmega8 as listed on
63.
Reset input. A low level on this pin for longer than the minimum pulse length will generate a
reset, even if the clock is not running. The minimum pulse length is given in
38. Shorter pulses are not guaranteed to generate a reset.
and
“System Clock and Clock Options” on page
Table 15 on page
25.
38. Shorter pulses are not guaranteed to
“Alternate Functions of Port B” on page
page
61.
ATmega8(L)
Table 15 on page
page
5