ATMEGA8L-8PU Atmel, ATMEGA8L-8PU Datasheet - Page 147

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

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

2486O–AVR–10/04
Table 53. Recommended Maximum Receiver Baud Rate Error for Normal Speed Mode
(U2X = 0)
Table 54. Recommended Maximum Receiver Baud Rate Error for Double Speed Mode
(U2X = 1)
The recommendations of the maximum Receiver baud rate error was made under the
assumption that the Receiver and Transmitter equally divides the maximum total error.
There are two possible sources for the Receivers Baud Rate error. The Receiver’s sys-
tem clock (XTAL) will always have some minor instability over the supply voltage range
and the temperature range. When using a crystal to generate the system clock, this is
rarely a problem, but for a resonator the system clock may differ more than 2% depend-
ing of the resonators tolerance. The second source for the error is more controllable.
The baud rate generator can not always do an exact division of the system frequency to
get the baud rate wanted. In this case an UBRR value that gives an acceptable low error
can be used if possible.
(Data+Parity Bit)
(Data+Parity Bit)
D#
10
D#
10
5
6
7
8
9
5
6
7
8
9
R
R
94,12
94,92
95,52
96,00
96,39
96,70
slow
93,20
94,12
94,81
95,36
95,81
96,17
slow
(%)
(%)
R
105,66
104,92
104,35
103,90
103,53
103,23
R
106,67
105,79
105,11
104,58
104,14
103,78
fast
fast
(%)
(%)
+5.66/-5.88
+4.92/-5.08
+4.35/-4.48
+3.90/-4.00
+3.53/-3.61
+3.23/-3.30
Max Total
+5.79/-5.88
+5.11/-5.19
+4.58/-4.54
+4.14/-4.19
+3.78/-3.83
Error (%)
Max Total
+6.67/-6.8
Error (%)
Recommended Max
Recommended Max
Receiver Error (%)
ATmega8(L)
Receiver Error (%)
± 2.5
± 2.0
± 1.5
± 1.5
± 1.5
± 1.0
± 3.0
± 2.0
± 2.0
± 2.0
± 1.5
± 1.5
147