ATXMEGA256A3B-MH Atmel, ATXMEGA256A3B-MH Datasheet - Page 248
![MCU AVR 256KB FLASH A3B 64-QFN](/photos/12/13/121326/313-64-qfn_sml.jpg)
ATXMEGA256A3B-MH
Manufacturer Part Number
ATXMEGA256A3B-MH
Description
MCU AVR 256KB FLASH A3B 64-QFN
Manufacturer
Atmel
Series
AVR® XMEGAr
Specifications of ATXMEGA256A3B-MH
Core Processor
AVR
Core Size
8/16-Bit
Speed
32MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, DMA, POR, PWM, WDT
Number Of I /o
49
Program Memory Size
256KB (128K x 16)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
16K x 8
Voltage - Supply (vcc/vdd)
1.6 V ~ 3.6 V
Data Converters
A/D 16x12b; D/A 2x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-MLF®, 64-QFN
Processor Series
ATXMEGA256x
Core
AVR8
Data Bus Width
8 bit, 16 bit
Data Ram Size
16 KB
Interface Type
I2C, SPI, USART
Maximum Clock Frequency
32 MHz
Number Of Programmable I/os
49
Number Of Timers
7
Operating Supply Voltage
1.6 V to 3.6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATAVRISP2, ATAVRONEKIT
Minimum Operating Temperature
- 40 C
On-chip Adc
12 bit, 8 Channel
On-chip Dac
12 bit, 2 Channel
For Use With
ATAVRONEKIT - KIT AVR/AVR32 DEBUGGER/PROGRMMRATSTK600 - DEV KIT FOR AVR/AVR32770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPI
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
ATXMEGA256A3B-MU
ATXMEGA256A3B-MU
ATXMEGA256A3B-MU
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATXMEGA256A3B-MH
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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21.12 Multi-processor Communication Mode
21.12.1
8077H–AVR–12/09
Using Multi-processor Communication Mode
A comparison of the USART in Master SPI mode and the SPI pins is shown
Table 21-5.
Enabling the Multi-processor Communication Mode (MPCM) effectively reduces the number of
incoming frames that has to be handled by the Receiver in a system with multiple MCUs com-
municating via the same serial bus. In this mode a dedicated bit in the frames is used to indicate
whether the frame is an address or data frame.
If the Receiver is set up to receive frames that contain 5 to 8 data bits, the first stop bit is used to
indicate the frame type. If the Receiver is set up for frames with 9 data bits, the ninth bit is used.
When the frame type bit is one, the frame contains an address. When the frame type bit is zero,
the frame is a data frame. The Transmitter is unaffected by the MPCM setting, but if 5- to 8-bit
character frames are used, the Transmitter must be set to use two stop bit since the first stop bit
is used for indicating the frame type.
If a particular slave MCU has been addressed, it will receive the following data frames as nor-
mal, while the other slave MCUs will ignore the received frames until another address frame is
received.
For an MCU to act as a master MCU, it should use a 9-bit character frame format. The ninth bit
must be set when an address frame is being transmitted and cleared when a data frame is being
transmitted. The slave MCUs must in this case be set to use a 9-bit character frame format.
The following procedure should be used to exchange data in Multi-processor Communication
mode:
Using any of the 5- to 8-bit character frame formats is possible, but impractical since the
Receiver must change between using n and n+1 character frame formats. This makes full
duplex operation difficult since the Transmitter and Receiver uses the same character size
setting.
1. All Slave MCUs are in Multi-processor Communication mode.
2. The Master MCU sends an address frame, and all slaves receive and read this frame.
3. Each Slave MCU determines if it has been selected.
4. The addressed MCU will disable MPCM and receive all data frames. The other slave
5. When the addressed MCU has received the last data frame, it must enable MPCM
MCUs will ignore the data frames.
again and wait for new address frame from the Master. The process then repeats from
2.
USART
XCK
RxD
TxD
N/A
Comparison of USART in Master SPI mode and SPI pins.
MOSI
MISO
SCK
SPI
SS
Comment
Master Out only
Master In only
Functionally identical
Not supported by USART in Master SPI
Table
XMEGA A
21-5.
248
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