ATMEGA8L-8PU Atmel, ATMEGA8L-8PU Datasheet - Page 133
![IC AVR MCU 8K 8MHZ 3V 28DIP](/photos/7/21/72189/453-28-dip_sml.jpg)
ATMEGA8L-8PU
Manufacturer Part Number
ATMEGA8L-8PU
Description
IC AVR MCU 8K 8MHZ 3V 28DIP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheets
1.ATMEGA8L-8MU.pdf
(25 pages)
2.ATMEGA8L-8MU.pdf
(302 pages)
3.ATMEGA8-16PU.pdf
(305 pages)
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA8L-8PU
Manufacturer:
BROADCOM
Quantity:
101
Company:
Part Number:
ATMEGA8L-8PU
Manufacturer:
ATMEL
Quantity:
33 600
Part Number:
ATMEGA8L-8PU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Company:
Part Number:
ATMEGA8L-8PU-QS096
Manufacturer:
ATMEL
Quantity:
56
Double Speed Operation
(U2X)
External Clock
2486O–AVR–10/04
Table 52. Equations for Calculating Baud Rate Register Setting
Note:
Some examples of UBRR values for some system clock frequencies are found in Table
60 (see page 156).
The transfer rate can be doubled by setting the U2X bit in UCSRA. Setting this bit only
has effect for the asynchronous operation. Set this bit to zero when using synchronous
operation.
Setting this bit will reduce the divisor of the baud rate divider from 16 to 8, effectively
doubling the transfer rate for asynchronous communication. Note however that the
Receiver will in this case only use half the number of samples (reduced from 16 to 8) for
data sampling and clock recovery, and therefore a more accurate baud rate setting and
system clock are required when this mode is used. For the Transmitter, there are no
downsides.
External clocking is used by the Synchronous Slave modes of operation. The descrip-
tion in this section refers to Figure 62 for details.
External clock input from the XCK pin is sampled by a synchronization register to mini-
mize the chance of meta-stability. The output from the synchronization register must
then pass through an edge detector before it can be used by the Transmitter and
Receiver. This process introduces a two CPU clock period delay and therefore the max-
imum external XCK clock frequency is limited by the following equation:
Note that f
mended to add some margin to avoid possible loss of data due to frequency variations.
Operating Mode
Asynchronous Normal mode
(U2X = 0)
Asynchronous Double Speed
Mode (U2X = 1)
Synchronous Master Mode
BAUD Baud rate (in bits per second, bps)
f
UBRR Contents of the UBRRH and UBRRL Registers, (0 - 4095)
OSC
1. The baud rate is defined to be the transfer rate in bit per second (bps).
System Oscillator clock frequency
osc
depends on the stability of the system clock source. It is therefore recom-
BAUD
BAUD
BAUD
Equation for Calculating
f
XCK
Baud Rate
=
=
=
-------------------------------------- -
16 UBRR
<
---------------------------------- -
8 UBRR
---------------------------------- -
2 UBRR
(
(
f
---------- -
(
OSC
4
f
f
f
OSC
OSC
OSC
(1)
+
+
+
1
1
1
)
)
)
Equation for Calculating
UBRR
UBRR
UBRR
ATmega8(L)
UBRR Value
=
=
=
----------------------- - 1
16BAUD
------------------- - 1
8BAUD
------------------- - 1
2BAUD
f
f
f
OSC
OSC
OSC
–
–
–
133