ATMEGA8L-8MUR Atmel, ATMEGA8L-8MUR Datasheet - Page 144
![no-image](/images/manufacturer_photos/0/0/78/atmel_sml.jpg)
ATMEGA8L-8MUR
Manufacturer Part Number
ATMEGA8L-8MUR
Description
MCU AVR 8KB FLASH 8MHZ 32QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA8L-8MU.pdf
(302 pages)
Specifications of ATMEGA8L-8MUR
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 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Asynchronous
Operational Range
144
ATmega8(L)
The operational range of the Receiver is dependent on the mismatch between the received bit
rate and the internally generated baud rate. If the Transmitter is sending frames at too fast or too
slow bit rates, or the internally generated baud rate of the Receiver does not have a similar (see
Table
The following equations can be used to calculate the ratio of the incoming data rate and internal
Receiver baud rate.
D
S
S
S
R
Table 53
that Normal Speed mode has higher toleration of baud rate variations.
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
(Data + Parity Bit)
F
M
slow
(Data + Parity Bit)
Sum of character size and parity size (D = 5-bit to 10-bit)
Samples per bit. S = 16 for Normal Speed mode and S = 8 for Double Speed mode
First sample number used for majority voting. S
Double Speed mode
Middle sample number used for majority voting. S
Double Speed mode
is the ratio of the slowest incoming data rate that can be accepted in relation to the
Receiver baud rate. R
accepted in relation to the Receiver baud rate
53) base frequency, the Receiver will not be able to synchronize the frames to the start bit.
D#
10
D#
R
10
5
6
7
8
9
and
5
6
7
8
9
(U2X = 1)
slow
Table 54
=
------------------------------------------ -
S 1
–
(
94.12
94.92
95.52
96.00
96.39
96.70
R
D
+
93.20
94.12
94.81
95.36
95.81
96.17
(%)
R
list the maximum Receiver baud rate error that can be tolerated. Note
slow
(%)
+
D S ⋅
slow
1
fast
)S
+
is the ratio of the fastest incoming data rate that can be
S
105.66
104.92
104.35
103.90
103.53
103.23
F
106.67
105.79
105.11
104.58
104.14
103.78
R
(%)
R
(%)
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 (%)
+6.67/-6.8
Max Total
Error (%)
F
R
= 8 for Normal Speed and S
M
fast
= 9 for Normal Speed and S
=
-----------------------------------
(
Recommended Max
Recommended Max
D
Receiver Error (%)
Receiver Error (%)
(
+
D
1
+
)S
2
±2.5
±2.0
±1.5
±1.5
±1.5
±1.0
±3.0
±2.0
±2.0
±2.0
±1.5
±1.5
)S
+
S
M
2486Z–AVR–02/11
F
= 4 for
M
= 5 for
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