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ATmega64A [DATASHEET]
8160D–AVR–02/2013
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 system clock (XTAL) will always
have some minor instability over the supply voltage range and the temperature range. When using a crystal to gen-
erate the system clock, this is rarely a problem, but for a resonator the system clock may differ more than 2%
depending of the resonators tolerance. The second source for the error is more controllable. The baud rate gener-
ator 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.
21.9
Multi-processor Communication Mode
Setting the Multi-processor Communication mode n (MPCMn) bit in UCSRnA enables a filtering function of incom-
ing 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 Transmitter is unaffected
by the MPCMn 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 five to eight 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
(RXB8n) 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.
The Multi-processor Communication mode enables several Slave MCUs to receive data from a Master MCU. This
is done by first decoding an address frame to find out which MCU has been addressed. If a particular Slave MCU
has been addressed, it will receive the following data frames as normal, while the other slave MCUs will ignore the
received frames until another address frame is received.
Table 21-2.
Recommended Maximum Receiver Baud Rate Error for Normal Speed Mode (U2Xn = 0)
D
# (Data+Parity Bit)
R
slow (%)
R
fast (%)
Max Total Error
(%)
Recommended Max Receiver
Error (%)
5
93.20
106.67
+6.67/-6.8
±3.0
6
94.12
105.79
+5.79/-5.88
±2.5
7
94.81
105.11
+5.11/-5.19
±2.0
8
95.36
104.58
+4.58/-4.54
±2.0
9
95.81
104.14
+4.14/-4.19
±1.5
10
96.17
103.78
+3.78/-3.83
±1.5
Table 21-3.
Recommended Maximum Receiver Baud Rate Error for Double Speed Mode (U2Xn = 1)
D
# (Data+Parity Bit)
Rslow (%)
Rfast (%)
Max Total Error
(%)
Recommended Max Receiver
Error (%)
5
94.12
105.66
+5.66/-5.88
±2.5
6
94.92
104.92
+4.92/-5.08
±2.0
7
95.52
104.35
+4.35/-4.48
±1.5
8
96.00
103.90
+3.90/-4.00
±1.5
9
96.39
103.53
+3.53/-3.61
±1.5
10
96.70
103.23
+3.23/-3.30
±1.0