ATMEGA329V-8MUR Atmel, ATMEGA329V-8MUR Datasheet - Page 194
ATMEGA329V-8MUR
Manufacturer Part Number
ATMEGA329V-8MUR
Description
MCU AVR 32K FLASH 8MHZ 64QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA329-16AU.pdf
(392 pages)
Specifications of ATMEGA329V-8MUR
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, LCD, POR, PWM, WDT
Number Of I /o
54
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
1.8 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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19.11.5
194
ATmega329/3290/649/6490
UBRRnL and UBRRnH – USART Baud Rate Registers n
• 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 sample,
and the synchronous clock (XCK).
Table 19-12. UCPOLn Bit Settings
• Bit 15:12 – Reserved Bits
These bits are reserved for future use. For compatibility with future devices, these bit must be
written to zero when UBRRnH is written.
• Bit 11:0 – UBRR11:0: USART Baud Rate Register
This is a 12-bit register which contains the USART baud rate. The UBRRnH contains the four
most significant bits, and the UBRRnL contains the eight least significant bits of the USART
baud rate. Ongoing transmissions by the Transmitter and Receiver will be corrupted if the baud
rate is changed. Writing UBRRnL will trigger an immediate update of the baud rate prescaler.
Bit
Read/Write
Initial Value
UCPOLn
0
1
R/W
15
R
–
7
0
0
R/W
14
R
–
6
0
0
Transmitted Data Changed
(Output of TxD Pin)
Rising XCK Edge
Falling XCK Edge
R/W
13
R
–
5
0
0
R/W
12
R
–
4
0
0
UBRRn[7:0]
R/W
R/W
11
3
0
0
R/W
R/W
10
UBRRn[11:8]
2
0
0
Received Data Sampled
(Input on RxD Pin)
Falling XCK Edge
Rising XCK Edge
R/W
R/W
9
1
0
0
R/W
R/W
0
0
0
8
UBRRnH
UBRRnL
2552K–AVR–04/11
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