ATMEGA2561V ATMEL [ATMEL Corporation], ATMEGA2561V Datasheet - Page 230

• Manufacturer Part Number: ATMEGA2561V
• Description: 8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

230
ATmega640/1280/1281/2560/2561
• Bits 5:4 – UPMn1:0: Parity Mode
These bits enable and set type of parity generation and check. If enabled, the Transmit-
ter will automatically generate and send the parity of the transmitted data bits within
each frame. The Receiver will generate a parity value for the incoming data and com-
pare it to the UPMn setting. If a mismatch is detected, the UPEn Flag in UCSRnA will be
set.
Table 105. UPMn Bits Settings
• Bit 3 – USBSn: Stop Bit Select
This bit selects the number of stop bits to be inserted by the Transmitter. The Receiver
ignores this setting.
Table 106. USBS Bit Settings
• Bit 2:1 – UCSZn1:0: Character Size
The UCSZn1:0 bits combined with the UCSZn2 bit in UCSRnB sets the number of data
bits (Character SiZe) in a frame the Receiver and Transmitter use.
Table 107. UCSZn Bits Settings
UCSZn2
UPMn1
0
0
0
0
1
1
1
1
0
0
1
1
USBSn
0
1
UCSZn1
UPMn0
0
0
1
1
0
0
1
1
0
1
0
1
Stop Bit(s)
1-bit
2-bit
Parity Mode
Disabled
Reserved
Enabled, Even Parity
Enabled, Odd Parity
UCSZn0
0
1
0
1
0
1
0
1
Character Size
5-bit
6-bit
7-bit
8-bit
Reserved
Reserved
Reserved
9-bit
2549K–AVR–01/07