ATUC128L4U Atmel Corporation, ATUC128L4U Datasheet - Page 454

• 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

20.6.5.11
20.6.5.12
Figure 20-26. Frame Slot Mode with Automatic Checksum
32142A–12/2011
TXRDY
Write
LINID
Write
THR
LINTC
Break
Checksum
Frame Slot Mode
Header
Synch
Table 20-8.
The last frame field is the checksum. It is configured by the Checksum Type (LINMR.CHKTYP),
and the Checksum Disable (LINMR.CHKDIS) bits. TXRDY will not be set after the last THR data
write if enabled. Writing a one to CHKDIS will disable the automatic checksum genera-
tion/checking, and the user may send/check this last byte manually, disguised as a normal data.
The checksum is an inverted 8-bit sum with carry, either:
A LIN master can be configured to use frame slots with a pre-defined minimum length. Writing a
one to the Frame Slot Mode Disable bit (LINMR.FSDIS) disables this mode. This mode will not
allow TXRDY to be set after a frame transfer until the entire frame slot duration has elapsed, in
effect preventing the master from sending a new header. The LIN Transfer Complete bit
(CSR.LINTC) will still be set after the checksum has been sent. Writing a one to CR.RSTST
clears LINTC.
The minimum frame slot size is determined by TFrame_Maximum, and calculated below (all val-
ues in bit periods):
• DLM=1: the response data length is defined by the Identifier bits according to the table below.
• over all data bytes, called a classic checksum. This is used for LIN 1.3 compliant slaves, and
• over all data bytes and the protected identifier, called an enhanced checksum. This is used
• THeader_Nominal = 34
automatically managed when CHKDIS=0, and CHKTYP=1.
for LIN 2.0 compliant slaves, and automatically managed when CHKDIS=0, and CHKTYP=0.
Data 1
IDCHR[5]
Protected
Identifier
Data3
0
0
1
1
Frame slot = TFrame_Maximum
Response Data Length if DLM = 1
Response
space
Data 2
Frame
Data 1
Data 3
IDCHR[4]
0
1
0
1
Data N
Response
Data N-1
ATUC64/128/256L3/4U
Response Data Length [bytes]
Data N
Frame Slot Mode
Checksum
2
2
4
8
Disabled
Frame Slot Mode
frame
space
Inter-
Enabled
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