ATMEGA8L-8PU Atmel, ATMEGA8L-8PU Datasheet - Page 121

IC AVR MCU 8K 8MHZ 3V 28DIP

ATMEGA8L-8PU

Manufacturer Part Number
ATMEGA8L-8PU
Description
IC AVR MCU 8K 8MHZ 3V 28DIP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheets

Specifications of ATMEGA8L-8PU

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 6x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
28-DIP (0.300", 7.62mm)
Cpu Family
ATmega
Device Core
AVR
Device Core Size
8b
Frequency (max)
8MHz
Interface Type
SPI/TWI/USART
Total Internal Ram Size
1KB
# I/os (max)
23
Number Of Timers - General Purpose
3
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
2.7V
On-chip Adc
6-chx10-bit
Instruction Set Architecture
RISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Through Hole
Pin Count
28
Package Type
PDIP
Processor Series
ATMEGA8x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
1 KB
Maximum Clock Frequency
8 MHz
Number Of Programmable I/os
23
Number Of Timers
3
Operating Supply Voltage
2.7 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
Through Hole
3rd Party Development Tools
EWAVR, EWAVR-BL
Minimum Operating Temperature
- 40 C
Controller Family/series
AVR MEGA
No. Of I/o's
23
Eeprom Memory Size
512Byte
Ram Memory Size
1KB
Cpu Speed
8MHz
Rohs Compliant
Yes
For Use With
ATSTK600-TQFP32 - STK600 SOCKET/ADAPTER 32-TQFPATSTK600-DIP40 - STK600 SOCKET/ADAPTER 40-PDIP770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAGATAVRISP2 - PROGRAMMER AVR IN SYSTEMATSTK500 - PROGRAMMER AVR STARTER KIT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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Timer/Counter Prescaler
Special Function IO Register –
SFIOR
2486O–AVR–10/04
Figure 56. Prescaler for Timer/Counter2
The clock source for Timer/Counter2 is named clk
the main system I/O clock clk
asynchronously clocked from the TOSC1 pin. This enables use of Timer/Counter2 as a
Real Time Counter (RTC). When AS2 is set, pins TOSC1 and TOSC2 are disconnected
from Port B. A crystal can then be connected between the TOSC1 and TOSC2 pins to
serve as an independent clock source for Timer/Counter2. The Oscillator is optimized
for use with a 32.768 kHz crystal. Applying an external clock source to TOSC1 is not
recommended.
For Timer/Counter2, the possible prescaled selections are: clk
clk
selected. Setting the PSR2 bit in SFIOR resets the prescaler. This allows the user to
operate with a predictable prescaler.
• Bit 1 – PSR2: Prescaler Reset Timer/Counter2
When this bit is written to one, the Timer/Counter2 prescaler will be reset. The bit will be
cleared by hardware after the operation is performed. Writing a zero to this bit will have
no effect. This bit will always be read as zero if Timer/Counter2 is clocked by the internal
CPU clock. If this bit is written when Timer/Counter2 is operating in Asynchronous
mode, the bit will remain one until the prescaler has been reset.
Bit
Read/Write
Initial Value
T2S
/128, clk
TOSC1
clk
PSR2
CS20
CS21
CS22
AS2
I/O
T2S
R
7
0
/256, and clk
R
6
0
clk
T2S
T2S
I/O
R
5
0
. By setting the AS2 bit in ASSR, Timer/Counter2 is
/1024. Additionally, clk
TIMER/COUNTER2 CLOCK SOURCE
Clear
R
4
0
0
ACME
10-BIT T/C PRESCALER
R/W
3
0
T2S
clk
T2
. clk
T2S
PUD
R/W
T2S
2
0
as well as 0 (stop) may be
is by default connected to
T2S
ATmega8(L)
PSR2
/8, clk
R/W
1
0
T2S
PSR10
R/W
/32, clk
0
0
SFIOR
T2S
/64,
121

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