ATA6612P-PLPW Atmel, ATA6612P-PLPW Datasheet - Page 212
![MCU W/LIN TXRX REG WTCHDG 48-QFN](/photos/6/82/68297/48-qfn_sml.jpg)
ATA6612P-PLPW
Manufacturer Part Number
ATA6612P-PLPW
Description
MCU W/LIN TXRX REG WTCHDG 48-QFN
Manufacturer
Atmel
Series
AVR® ATA66 LIN-SBCr
Datasheet
1.ATA6612-EK.pdf
(364 pages)
Specifications of ATA6612P-PLPW
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I²C, LIN, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
23
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
48-QFN Exposed Pad
Processor Series
ATA6x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
1 KB
Interface Type
SPI, TWI, USART
Maximum Clock Frequency
16 MHz
Number Of Programmable I/os
23
Number Of Timers
3
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 8 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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6.17.8.1
6.17.9
6.17.9.1
212
Atmel ATA6612/ATA6613
USART Register Description
Using MPCMn
USART I/O Data Register n– UDRn
For an MCU to act as a master MCU, it can use a 9-bit character frame format (UCSZn = 7).
The ninth bit (TXB8n) must be set when an address frame (TXB8n = 1) or cleared when a data
frame (TXB = 0) 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. If 5- to 8-bit character frames are used, the Transmitter must be set to use two stop bit
(USBSn = 1) since the first stop bit is used for indicating the frame type.
Do not use Read-Modify-Write instructions (SBI and CBI) to set or clear the MPCMn bit. The
MPCMn bit shares the same I/O location as the TXCn Flag and this might accidentally be
cleared when using SBI or CBI instructions.
The USART Transmit Data Buffer Register and USART Receive Data Buffer Registers share
the same I/O address referred to as USART Data Register or UDRn. The Transmit Data Buffer
Register (TXB) will be the destination for data written to the UDRn Register location. Reading
the UDRn Register location will return the contents of the Receive Data Buffer Register (RXB).
For 5-, 6-, or 7-bit characters the upper unused bits will be ignored by the Transmitter and set
to zero by the Receiver.
1. All Slave MCUs are in Multi-processor Communication mode (MPCMn in
2. The Master MCU sends an address frame, and all slaves receive and read this frame.
3. Each Slave MCU reads the UDRn Register and determines if it has been selected. If
4. The addressed MCU will receive all data frames until a new address frame is
5. When the last data frame is received by the addressed MCU, the addressed MCU
Initial Value
Read/Write
Bit
UCSRnA is set).
In the Slave MCUs, the RXCn Flag in UCSRnA will be set as normal.
so, it clears the MPCMn bit in UCSRnA, otherwise it waits for the next address byte
and keeps the MPCMn setting.
received. The other Slave MCUs, which still have the MPCMn bit set, will ignore the
data frames.
sets the MPCMn bit and waits for a new address frame from master. The process
then repeats from 2.
R/W
7
0
R/W
6
0
R/W
5
0
R/W
4
0
RXB[7:0]
TXB[7:0]
R/W
3
0
R/W
2
0
R/W
1
0
R/W
0
0
9111H–AUTO–01/11
UDRn (Read)
UDRn (Write)
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