ATMEGA8515L-8JJ Atmel, ATMEGA8515L-8JJ Datasheet - Page 151
![IC MCU AVR 8K 5V 8MHZ 44-PLCC](/photos/6/70/67043/453-44-plcc_sml.jpg)
ATMEGA8515L-8JJ
Manufacturer Part Number
ATMEGA8515L-8JJ
Description
IC MCU AVR 8K 5V 8MHZ 44-PLCC
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8515L-8JJ
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
EBI/EMI, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
35
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-PLCC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Multi-processor
Communication Mode
2512K–AVR–01/10
Table 61. Recommended Maximum Receiver Baud Rate Error for Normal Speed Mode
(U2X = 0)
Table 62. 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 Receiver’s 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.
Setting the Multi-processor Communication mode (MPCM) bit in UCSRA enables a fil-
tering function of incoming frames received by the USART Receiver. Frames that do not
contain address information will be ignored and not put into the receive buffer. This
effectively reduces the number of incoming frames that has to be handled by the CPU,
in a system with multiple MCUs that communicate via the same serial bus. The Trans-
mitter is unaffected by the MPCM setting, but has to be used differently when it is a part
of a system utilizing the Multi-processor Communication mode.
If the Receiver is set up to receive frames that contain 5 to 8 data bits, then the first stop
bit indicates if the frame contains data or address information. If the Receiver is set up
for frames with nine data bits, then the ninth bit (RXB8) is used for identifying address
and data frames. When the frame type bit (the first stop or the ninth bit) is one, the frame
contains an address. When the frame type bit is zero the frame is a data frame.
# (Data+Parity Bit)
# (Data+Parity Bit)
10
10
D
5
6
7
8
9
D
5
6
7
8
9
R
R
slow
93.20
94.12
94.81
95.36
95.81
96.17
slow
94.12
94.92
95.52
96.00
96.39
96.70
(%)
(%)
R
R
106.67
105.79
105.11
104.58
104.14
103.78
105.66
104.92
104.35
103.90
103.53
103.23
fast
fast
(%)
(%)
+5.79/-5.88
+5.11/-5.19
+4.58/-4.54
+4.14/-4.19
+3.78/-3.83
+5.66/-5.88
+4.92/-5.08
+4.32/-4.48
+3.90/-4.00
+3.53/-3.61
+3.23/-3.30
Max Total
+6.67/-6.8
Max Total
Error (%)
Error (%)
ATmega8515(L)
Recommended Max
Recommended Max
Receiver Error (%)
Receiver Error (%)
± 3.0
± 2.5
± 2.0
± 2.0
± 1.5
± 1.5
± 2.5
± 2.0
± 1.5
± 1.5
± 1.5
± 1.0
151
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