ATmega88PA Automotive Atmel Corporation, ATmega88PA Automotive Datasheet - Page 200

• Manufacturer Part Number: ATmega88PA Automotive
• Manufacturer: Atmel Corporation

200
Atmel ATmega48PA/88PA/168PA [Preliminary]
• 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 20-10. 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 20-11. UCSZn Bits Settings
• Bit 0 – UCPOLn: Clock Polarity
This bit is used for synchronous mode only. Write this bit to zero when asynchronous mode is
used. The UCPOLn bit sets the relationship between data output change and data input sam-
ple, and the synchronous clock (XCKn).
Table 20-12. UCPOLn Bit Settings
UCPOLn
0
1
UCSZn2
0
0
0
0
1
1
1
1
Transmitted Data Changed (Output of
TxDn Pin)
Rising XCKn Edge
Falling XCKn Edge
USBSn
0
1
UCSZn1
0
0
1
1
0
0
1
1
Stop Bit(s)
1-bit
2-bit
UCSZn0
0
1
0
1
0
1
0
1
Received Data Sampled (Input on RxDn
Pin)
Falling XCKn Edge
Rising XCKn Edge
Character Size
5-bit
6-bit
7-bit
8-bit
Reserved
Reserved
Reserved
9-bit
9223B–AVR–09/11