AT32UC3A4128 Atmel Corporation, AT32UC3A4128 Datasheet - Page 562

• Manufacturer Part Number: AT32UC3A4128
• Manufacturer: Atmel Corporation

Specifications of AT32UC3A4128

• Flash (kbytes): 128 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 66 MHz
• Cpu: 32-bit AVR
• Hardware Qtouch Acquisition: No
• Usb Transceiver: 1
• Usb Speed: Hi-Speed
• Usb Interface: Device + OTG
• Spi: 6
• Twi (i2c): 2
• Uart: 4
• Sd / Emmc: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 128
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.0 to 3.6
• Operating Voltage (vcc): 3.0 to 3.6
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

25.6.3.11
32072G–11/2011
Receiver Time-out
Table 25-8.
The Time-out Value field in the Receiver Time-out Register (RTOR.TO) enables handling of vari-
able-length frames by detection of selectable idle durations on the RXD line. The value written to
TO is loaded to a decremental counter, and unless it is zero, a time-out will occur when the
amount of inactive bit periods match the initial counter value. If a time-out has not occurred, the
counter will reload and restart every time a new character arrives. A time-out sets the TIMEOUT
bit in CSR. Clearing TIMEOUT can be done in two ways:
Figure 25-23. Receiver Time-out Block Diagram
Table 25-9.
• Writing a one to the Start Time-out bit (CR.STTTO). This also aborts count down until the
• Writing a one to the Reload and Start Time-out bit (CR.RETTO). This also reloads the
RETTO
next character has been received.
counter and restarts count down immediately.
Baud Rate (bit/sec)
Baud Rate (bit/sec)
Character
Received
STTTO
115200
14400
19200
28800
33400
56000
57600
1 200
9 600
1 200
2 400
4 800
600
Maximum Baud Rate Dependent Timeguard Durations
Maximum Time-out Period
1
D
Clear
Q
Baud Rate
Clock
Clock
Bit Time (µs)
Bit time (µs)
1 667
69.4
52.1
34.7
29.9
17.9
17.4
833
104
833
417
208
8.7
16-bit Time-out
Counter
TO
Load
16-bit
Value
0
Timeguard (ms)
Time-out (ms)
109 225
212.50
54 613
27 306
13 653
26.56
17.71
13.28
8.85
7.63
4.55
4.43
2.21
=
TIMEOUT
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