ATMEGA323-8PI Atmel, ATMEGA323-8PI Datasheet - Page 99
ATMEGA323-8PI
Manufacturer Part Number
ATMEGA323-8PI
Description
IC AVR MCU 32K 8MHZ IND 40DIP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA323L-4PC.pdf
(247 pages)
Specifications of ATMEGA323-8PI
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
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)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
40-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
ATMEGA3238PI
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Examples of Baud Rate
Setting
1457G–AVR–09/03
• 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 cor-
rupted if the baud rate is changed. Writing UBRRL will trigger an immediate update of
the baud rate prescaler.
For standard crystal and resonator frequencies, the most commonly used baud rates for
asynchronous operation can be generated by using the UBRR settings in Table 36.
UBRR 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 resistance when the error ratings are high, especially for large serial
frames (see “Asynchronous Operational Range” on page 89). The error values are cal-
culated using the following equation:
Table 36. Examples of UBRR Settings for Commonly Used Oscillator Frequencies –
UBRR = 0, Error = 0.0%
Baud
Rate
(bps)
2400
4800
9600
14.4K
19.2K
28.8K
38.4K
57.6K
76.8K
115.2K
230.4K
250K
Max
Baud
Rate
(bps)
2400
4800
9600
UBRR
UBRR
25
12
51
25
12
6
3
2
1
1
0
–
–
–
–
62.5 Kbps
U2X = 0
U2X = 0
f
-18.6%
osc
-7.0%
Error
f
0.2%
0.2%
8.5%
8.5%
8.5%
8.5%
0.2%
0.2%
0.2%
Error
osc
–
–
–
–
Error[%]
= 1.0000 MHz
= 2.0000 MHz
UBRR
UBRR
103
=
51
25
12
51
25
8
6
3
2
1
1
0
–
–
125 Kbps
U2X = 1
U2X = 1
BaudRate
------------------------------------------------------- - 1
-18.6%
BaudRate
-3.5%
-7.0%
Error
0.2%
0.2%
0.2%
8.5%
8.5%
8.5%
8.5%
0.2%
0.2%
0.2%
Error
–
–
Closest Match
UBRR
UBRR
47
23
11
95
47
23
7
5
3
2
1
1
0
–
–
115.2 Kbps
U2X = 0
U2X = 0
–
ATmega323(L)
f
-25.0%
osc
Error
f
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100%
Error
osc
–
–
= 1.8432 MHz
= 3.6864 MHz
UBRR
UBRR
191
95
47
23
15
11
95
47
7
5
3
2
1
0
–
230.4 Kbps
U2X = 1
U2X = 1
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
Error
0.0%
0.0%
0.0%
–
99
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