ATMEGA64A-MNR Atmel, ATMEGA64A-MNR Datasheet - Page 192

• Manufacturer Part Number: ATMEGA64A-MNR
• Description: IC MCU AVR 64K FLASH 8QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA64A-MNR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 2 KB
• Interface Type: SPI, UART, I2C
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 53
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Operating Temperature Range: - 40 C to + 85 C
• Processor To Be Evaluated: ATMEGA64A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

20.10 Examples of Baud Rate Setting
Table 20-4.
1.
8160C–AVR–07/09
Baud
Rate
(bps)
2400
4800
9600
14.4k
19.2k
28.8k
38.4k
57.6k
76.8k
115.2k
230.4k
250k
Max
(1)
UBRR = 0, Error = 0.0%
UBRRn
25
12
6
3
2
1
1
0
–
–
–
–
Examples of UBRR Settings for Commonly Used Oscillator Frequencies
62.5 kbps
U2X = 0
f
-18.6%
osc
-7.0%
Error
0.2%
0.2%
8.5%
8.5%
8.5%
8.5%
–
–
–
–
= 1.0000 MHz
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
Table 20-7 on page
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
using the following equation:
UBRRn
51
25
12
8
6
3
2
1
1
0
–
–
125 kbps
U2X = 1
“Asynchronous Operational Range” on page
-18.6%
Errorn
-3.5%
-7.0%
0.2%
0.2%
0.2%
8.5%
8.5%
8.5%
8.5%
–
–
195. UBRRn values which yield an actual baud rate differing less than 0.5%
UBRRn
47
23
11
Error[%]
7
5
3
2
1
1
0
–
–
115.2 kbps
U2X = 0
f
osc
-25.0%
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
=
= 1.8432 MHz
–
–
⎛
⎝
BaudRate
------------------------------------------------------- - 1
UBRRn
BaudRate
95
47
23
15
11
230.4 kbps
7
3
2
0
–
5
1
U2X = 1
Closest Match
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
–
–
189). The error values are calculated
UBRRn
⎞
⎠
•
51
12
25
100%
8
6
3
2
1
1
0
–
–
125 kbps
U2X = 0
f
Table 20-4 on page 192
osc
-18.6%
-3.5%
-7.0%
Error
0.2%
0.2%
0.2%
8.5%
8.5%
8.5%
8.5%
ATmega64A
–
–
= 2.0000 MHz
UBRRn
103
51
25
16
12
8
6
3
2
1
–
0
250 kbps
U2X = 1
-3.5%
-7.0%
Error
0.2%
0.2%
0.2%
2.1%
0.2%
8.5%
8.5%
8.5%
0.0%
–
192
to