AT32UC3L0256 Atmel Corporation, AT32UC3L0256 Datasheet - Page 388

• Manufacturer Part Number: AT32UC3L0256
• Manufacturer: Atmel Corporation

Specifications of AT32UC3L0256

• Flash (kbytes): 256 Kbytes
• Pin Count: 48
• Max. Operating Frequency: 50 MHz
• Cpu: 32-bit AVR
• # Of Touch Channels: 17
• Hardware Qtouch Acquisition: Yes
• Max I/o Pins: 36
• Ext Interrupts: 36
• Usb Speed: No
• Usb Interface: No
• Spi: 5
• Twi (i2c): 2
• Uart: 4
• Lin: 4
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 12
• Adc Speed (ksps): 460
• Analog Comparators: 8
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 16
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.62 to 3.6
• Operating Voltage (vcc): 1.62 to 3.6
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 6
• Output Compare Channels: 18
• Input Capture Channels: 12
• Pwm Channels: 35
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

Figure 19-14. Break Transmission
19.6.3.11
19.6.3.12
32145A–12/2011
Baud Rate
TXEMPTY
TXRDY
Clock
Write
TXD
CR
Receive Break
Hardware Handshaking
Start
Bit
D0
D1
D2
STTBRK = 1
A break condition is assumed when incoming data, parity, and stop bits are zero. This corre-
sponds to a framing error, but FRAME will remain zero while the Break Received/End Of Break
bit (CSR.RXBRK) is set. Writing a one to CR.RSTSTA will clear RXBRK. An end of break will
also set RXBRK, and is assumed when TX is high for at least 2/16 of a bit period in asynchro-
nous mode, or when a high level is sampled in synchronous mode.
The USART features an out-of-band hardware handshaking flow control mechanism, imple-
mentable by connecting the RTS and CTS pins with the remote device, as shown in
15.
Figure 19-15. Connection with a Remote Device for Hardware Handshaking
Writing 0x2 to the MR.MODE field configures the USART to operate in this mode. The receiver
will drive its RTS pin high when disabled or when the Reception Buffer Full bit (CSR.RXBUFF) is
set by the Buffer Full signal from the Peripheral DMA controller. If the receivers RTS pin is high,
the transmitters CTS pin will also be high and only the active character transactions will be com-
pleted. Allocating a new buffer to the DMA controller by clearing RXBUFF, will drive the RTS pin
low, allowing the transmitter to resume transmission. Detected level changes on the CTS pin
can trigger interrupts, and are reported by the CTS Input Change bit in the Channel Status Reg-
ister (CSR.CTSIC).
Figure 19-16
functionality.
D3
D4
D5
D6
D7
illustrates receiver functionality, and
Parity
Bit
Stop
Bit
USART
TXD
RXD
CTS
RTS
Break Transmission
STPBRK = 1
Figure 19-17
AT32UC3L0128/256
RXD
TXD
RTS
CTS
Remote
Device
End of Break
illustrates transmitter
Figure 19-
388