ATMEGA168PA-PU Atmel, ATMEGA168PA-PU Datasheet - Page 204
ATMEGA168PA-PU
Manufacturer Part Number
ATMEGA168PA-PU
Description
MCU, 8BIT, AVR, 16K FLASH, 28PDIP
Manufacturer
Atmel
Datasheet
1.ATMEGA48A-PU.pdf
(566 pages)
Specifications of ATMEGA168PA-PU
Controller Family/series
Atmega
No. Of I/o's
23
Eeprom Memory Size
512Byte
Ram Memory Size
1KB
Cpu Speed
20MHz
No.
RoHS Compliant
Core Size
8bit
Program Memory Size
16KB
Oscillator Type
External, Internal
Rohs Compliant
Yes
Available stocks
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Manufacturer
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Price
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ATMEGA168PA-PU
Manufacturer:
TI
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19.11.5
8271C–AVR–08/10
UBRRnL and UBRRnH – USART Baud Rate Registers
Table 19-11. UCPOLn Bit Settings
• Bit 15:12 – Reserved
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 – UBRR[11:0]: 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.
ATmega48A/48PA/88A/88PA/168A/168PA/328/328
Bit
Read/Write
Initial Value
UCPOLn
0
1
Transmitted Data Changed (Output of
TxDn Pin)
Rising XCKn Edge
Falling XCKn Edge
R/W
15
R
–
7
0
0
R/W
14
R
–
6
0
0
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
Received Data Sampled (Input on RxDn
Pin)
Falling XCKn Edge
Rising XCKn Edge
R/W
R/W
10
2
0
0
UBRRn[11:8]
R/W
R/W
9
1
0
0
R/W
R/W
8
0
0
0
UBRRnH
UBRRnL
204
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