ATMEGA1280V-8CU Atmel, ATMEGA1280V-8CU Datasheet - Page 227
![IC MCU AVR 128K FLASH 100-CBGA](/photos/6/89/68968/313-100-cbga_sml.jpg)
ATMEGA1280V-8CU
Manufacturer Part Number
ATMEGA1280V-8CU
Description
IC MCU AVR 128K FLASH 100-CBGA
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA1280V-8CU
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
EBI/EMI, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
86
Program Memory Size
128KB (64K x 16)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
8K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 16x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
100-TFBGA
Processor Series
ATMEGA128x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
8 KB
Interface Type
2-Wire, SPI, USART
Maximum Clock Frequency
8 MHz
Number Of Programmable I/os
86
Number Of Timers
6
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWAVR, EWAVR-BL
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 16 Channel
For Use With
ATSTK600-TQFP100 - STK600 SOCKET/ADAPTER 100-TQFP770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAGATAVRISP2 - PROGRAMMER AVR IN SYSTEMATSTK503 - STARTER KIT AVR EXP MODULE 100PATJTAGICE2 - AVR ON-CHIP D-BUG SYSTEM
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATMEGA1280V-8CU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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21.9.5
21.10 Examples of Baud Rate Setting
Table 21-9.
2549M–AVR–09/10
14.4 K
19.2 K
28.8 K
38.4 K
Baud
(bps)
Rate
2400
4800
9600
UBRRnL and UBRRnH – USART Baud Rate Registers
UBRR
25
12
6
3
2
1
1
Examples of UBRRn Settings for Commonly Used Oscillator Frequencies
U2Xn = 0
f
-18.6%
osc
-7.0%
Error
0.2%
0.2%
8.5%
8.5%
8.5%
= 1.0000 MHz
• 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.
For standard crystal and resonator frequencies, the most commonly used baud rates for asyn-
chronous operation can be generated by using the UBRR settings in
on page
get 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
lowing equation:
Bit
Read/Write
Initial Value
UBRR
51
25
12
8
6
3
2
U2Xn = 1
231. UBRR values which yield an actual baud rate differing less than 0.5% from the tar-
-3.5%
-7.0%
Error
0.2%
0.2%
0.2%
8.5%
8.5%
R/W
15
R
–
7
0
0
UBRR
47
23
11
7
5
3
2
R/W
U2Xn = 0
14
R
–
6
0
0
Error[%]
f
osc
ATmega640/1280/1281/2560/2561
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
R/W
13
=
= 1.8432 MHz
R
–
5
0
0
⎛
⎝
BaudRate
------------------------------------------------------- - 1
UBRR
95
47
23
15
11
BaudRate
R/W
7
5
12
R
–
4
0
0
U2Xn = 1
220). The error values are calculated using the fol-
UBRR[7:0]
Closest Match
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
R/W
R/W
11
3
0
0
–
UBRR
⎞
⎠
R/W
R/W
51
25
12
10
•
2
0
0
8
6
3
2
UBRR[11:8]
100%
U2Xn = 0
f
Table 21-9
osc
-3.5%
-7.0%
Error
0.2%
0.2%
0.2%
8.5%
8.5%
R/W
R/W
9
1
0
0
= 2.0000 MHz
UBRR
R/W
R/W
103
8
0
0
0
51
25
16
12
to
8
6
U2Xn = 1
Table 21-12
UBRRHn
UBRRLn
-3.5%
-7.0%
Error
0.2%
0.2%
0.2%
2.1%
0.2%
227
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