AT32UC3A0256-ALUT Atmel, AT32UC3A0256-ALUT Datasheet - Page 332

• Manufacturer Part Number: AT32UC3A0256-ALUT
• Description: IC MCU AVR32 256KB FLASH 144LQFP
• Manufacturer: Atmel
• Series: AVR®32 UC3r

Specifications of AT32UC3A0256-ALUT

• Core Processor: AVR
• Core Size: 32-Bit
• Speed: 66MHz
• Connectivity: EBI/EMI, Ethernet, I²C, SPI, SSC, UART/USART, USB OTG
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 109
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 64K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 144-LQFP
• Processor Series: AT32UC3x
• Core: AVR32
• Data Bus Width: 32 bit
• Data Ram Size: 64 KB
• Interface Type: 2-Wire, RS-485, SPI, USART
• Maximum Clock Frequency: 66 MHz
• Number Of Programmable I/os: 69
• Number Of Timers: 3
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR32, EWAVR32-BL, KSK-EVK1100-PL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, ATEXTWIFI, ATEVK1100, ATEVK1105
• Minimum Operating Temperature: - 40 C
• Controller Family/series: AT32UC3A
• No. Of I/o's: 109
• Ram Memory Size: 64KB
• Cpu Speed: 66MHz
• No. Of Timers: 1
• Rohs Compliant: Yes
• Package: 144LQFP
• Device Core: AVR32
• Family Name: AT32
• Maximum Speed: 66 MHz
• Operating Supply Voltage: 1.8|3.3 V
• For Use With: ATEVK1105 - KIT EVAL FOR AT32UC3A0ATAVRONEKIT - KIT AVR/AVR32 DEBUGGER/PROGRMMR770-1008 - ISP 4PORT ATMEL AVR32 MCU SPIATEVK1100 - KIT DEV/EVAL FOR AVR32 AT32UC3A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

26.7.7
32058J–AVR32–04/11
RS485 Mode
The USART features the RS485 mode to enable line driver control. While operating in RS485
mode, the USART behaves as though in asynchronous or synchronous mode and configuration
of all the parameters is possible. The difference is that the RTS pin is driven high when the
transmitter is operating. The behavior of the RTS pin is controlled by the TXEMPTY bit. A typical
connection of the USART to a RS485 bus is shown in
Figure 26-36. Typical Connection to a RS485 Bus
The USART is set in RS485 mode by programming the MODE field in the Mode Register (MR)
to the value 0x1.
The RTS pin is at a level inverse to the TXEMPTY bit. Significantly, the RTS pin remains high
when a timeguard is programmed so that the line can remain driven after the last character com-
pletion.
transmission when the timeguard is enabled.
Figure 26-37. Example of RTS Drive with Timeguard
Figure 26-37 on page 332
Baud Rate
TXEMPTY
US_THR
TXRDY
Clock
Write
TXD
RTS
USART
Start
Bit
D0
RXD
TXD
RTS
gives an example of the RTS waveform during a character
D1
D2
D3
D4
D5
D6
Figure 26-36 on page
D7
Parity
Bit
Stop
Bit
Differential
Bus
TG = 4
AT32UC3A
332.
332