ATUC128L4U Atmel Corporation, ATUC128L4U Datasheet - Page 451

• Manufacturer Part Number: ATUC128L4U
• Manufacturer: Atmel Corporation

Specifications of ATUC128L4U

• Flash (kbytes): 128 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 Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 1
• Twi (i2c): 2
• Uart: 4
• Lin: 4
• Ssc: 1
• 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 20-22. Header Reception
20.6.5.7
Figure 20-24. Slave Node Synchronization
32142A–12/2011
With RSTSTA=1
Fractional Part (FP)
Clcok Divider (CD)
Write US_CR
Synchro Counter
Baud Rate
US_LINIR
Baud Rate
Clock
LINID
LINIDRX
RXD
BRGR
BRGR
Clock
RXD
Slave Node Synchronization
Synchronization is only done by the slave. If the Sync field is not 0x55, an Inconsistent Sync
Field error (CSR.LINISFE) is generated. The time between falling edges is measured by a 19-bit
counter, driven by the sampling clock (see
Figure 20-23. Sync Field
The counter starts when the Sync field start bit is detected, and continues for eight bit periods.
The 16 most significant bits (counter value divided by 8) becomes the new clock divider
(BRGR.CD), and the three least significant bits (the remainder) becomes the new fractional part
(BRGR.FP).
The synchronization accuracy depends on:
13 dominant bits (at 0)
• The theoretical slave node clock frequency; nominal clock frequency (F
• The baud rate
Break Field
13 dominant bits (at 0)
Break Field
Initial CD
1 recessive bit
Initial FP
Start
Delimiter
Break
bit
(at 1)
2 Tbit
1 recessive bit
Delimiter
Break
(at 1)
Start
Bit
Reset
1
Start
Bit
2 Tbit
0
1
Synch Byte = 0x55
1
0
8 Tbit
0
Synch Byte = 0x55
Section
1
Synch Field
1
0
0
2 Tbit
1
1
20.6.1).
0
0
ATUC64/128/256L3/4U
1
Stop
Bit
0
Start
Bit
000_0011_0001_0110_1101
2 Tbit
Stop
Bit
ID0 ID1 ID2
0000_0110_0010_1101
101
Start
Bit
ID0 ID1 ID2 ID3 ID4 ID5 ID6 ID7
ID3
ID4
Stop
bit
ID5
Nom
ID6
)
ID7
Stop
Bit
Stop
Bit
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