ATMEGA324PA-MCHR Atmel, ATMEGA324PA-MCHR Datasheet - Page 195
ATMEGA324PA-MCHR
Manufacturer Part Number
ATMEGA324PA-MCHR
Description
MCU AVR 32KB FLASH 20 MHZ 44QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA324PA-AUR.pdf
(468 pages)
Specifications of ATMEGA324PA-MCHR
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
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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18.11.5
8152G–AVR–11/09
UBRRnL and UBRRnH – USART Baud Rate Registers
• 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 (XCKn).
Table 18-8.
• 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 UBRRH is written.
• Bit 11:0 – UBRR11:0: USART Baud Rate Register
This is a 12-bit register which contains the USART baud rate. The UBRRH contains the four
most significant bits, and the UBRRL 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 UBRRL will trigger an immediate update of the baud rate prescaler.
Bit
Read/Write
Initial Value
UCPOLn
0
1
UCPOLn Bit Settings
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
ATmega164PA/324PA/644PA/1284P
R/W
13
R
–
5
0
0
R/W
12
R
–
4
0
0
UBRR[7:0]
R/W
R/W
11
3
0
0
Falling XCKn Edge
Received Data Sampled (Input on RxDn
Pin)
Rising XCKn Edge
R/W
R/W
10
2
0
0
UBRR[11:8]
R/W
R/W
9
1
0
0
R/W
R/W
8
0
0
0
UBRRHn
UBRRLn
195
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