ATmega329P Atmel Corporation, ATmega329P Datasheet - Page 193

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ATmega329P

Manufacturer Part Number
ATmega329P
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of ATmega329P

Flash (kbytes)
32 Kbytes
Pin Count
64
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
54
Ext Interrupts
17
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
1
Segment Lcd
100
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
2
Eeprom (bytes)
1024
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8 to 5.5
Operating Voltage (vcc)
1.8 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
4
Input Capture Channels
1
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes

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19.10.5
19.11 Examples of Baud Rate Setting
8021G–AVR–03/11
UBRRnL and UBRRnH – USART Baud Rate Registers n
Figure 19-13. 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.
For standard crystal and resonator frequencies, the most commonly used baud rates for asyn-
chronous operation can be generated by using the UBRRn settings in
values which yield an actual baud rate differing less than 0.5% from the target baud rate, are
bold in the table. Higher error ratings are acceptable, but the Receiver will have less noise resis-
tance when the error ratings are high, especially for large serial frames (see
Operational Range” on page
Bit
Read/Write
Initial Value
UCPOLn
0
1
R/W
15
R
7
0
0
R/W
14
Transmitted Data Changed (Output
of TxD Pin)
Rising XCK Edge
Falling XCK Edge
R
6
0
0
Error[%]
186). The error values are calculated using the following equation:
R/W
13
R
5
0
0
=
BaudRate
------------------------------------------------------- - 1
R/W
12
BaudRate
R
4
0
0
UBRRn[7:0]
Closest Match
R/W
R/W
11
3
0
0
ATmega329P/3290P
R/W
R/W
10
2
0
0
UBRRn[11:8]
Received Data Sampled (Input
on RxD Pin)
Falling XCK Edge
Rising XCK Edge
100%
R/W
R/W
9
1
0
0
Table
R/W
R/W
”Asynchronous
8
0
0
0
19-3. UBRRn
UBRRnH
UBRRnL
193

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