ATxmega32A4U Atmel Corporation, ATxmega32A4U Datasheet - Page 303
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ATxmega32A4U
Manufacturer Part Number
ATxmega32A4U
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega32A4U
Flash (kbytes)
32 Kbytes
Pin Count
44
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
34
Ext Interrupts
34
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
7
Twi (i2c)
2
Uart
5
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
12
Adc Resolution (bits)
12
Adc Speed (ksps)
2000
Analog Comparators
2
Resistive Touch Screen
No
Dac Channels
2
Dac Resolution (bits)
12
Temp. Sensor
Yes
Crypto Engine
AES/DES
Sram (kbytes)
4
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
1.6 to 3.6
Operating Voltage (vcc)
1.6 to 3.6
Fpu
No
Mpu / Mmu
no / no
Timers
5
Output Compare Channels
16
Input Capture Channels
16
Pwm Channels
16
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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23.12 Multiprocessor Communication Mode
23.12.1
23.13 IRCOM Mode of Operation
8331A–AVR–07/11
Using Multiprocessor Communication Mode
A comparison of the USART in master SPI mode and the SPI pins is shown
Table 23-5.
The multiprocessor communication mode effectively reduces the number of incoming frames
that have to be handled by the receiver in a system with multiple microcontrollers communicat-
ing 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 type.
If the receiver is set up to receive frames that contain five to eight data bits, the first stop bit is
used to indicate the frame type. If the receiver is set up for frames with nine 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. If 5-bit to 8-bit character frames are used, the transmitter
must be set to use two stop bits, 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 usual,
while the other slave MCUs will ignore the frames until another address frame is received.
The following procedure should be used to exchange data in multiprocessor communication
mode (MPCM):
The process then repeats from step 2.
Using any of the 5-bit to 8-bit character frame formats is impractical, as the receiver must
change between using n and n+1 character frame formats. This makes full-duplex operation dif-
ficult, since the transmitter and receiver must use the same character size setting.
IRCOM mode can be enabled to use the IRCOM module with the USART. This enables IrDA 1.4
compliant modulation and demodulation for baud rates up to 115.2kbps. When IRCOM mode is
enabled, double speed mode cannot be used for the USART.
• Interrupt timing is not compatible
• Pin control differs due to the master-only operation of the USART in SPI master mode
1. All slave MCUs are in multiprocessor 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 a new address frame from the master.
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 mode
Atmel AVR XMEGA AU
Table
23-5.
303
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