AT32UC3C164C Atmel Corporation, AT32UC3C164C Datasheet - Page 766

• Manufacturer Part Number: AT32UC3C164C
• Manufacturer: Atmel Corporation

Specifications of AT32UC3C164C

• Flash (kbytes): 64 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 66 MHz
• Cpu: 32-bit AVR
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 81
• Ext Interrupts: 100
• Usb Transceiver: 1
• Quadrature Decoder Channels: 2
• Usb Speed: Full Speed
• Usb Interface: Device + OTG
• Spi: 7
• Twi (i2c): 3
• Uart: 5
• Can: 2
• Lin: 5
• Ssc: 1
• Ethernet: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 16
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 4
• Resistive Touch Screen: No
• Dac Channels: 4
• Dac Resolution (bits): 12
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 20
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.0 to 3.6 or 4.5 to 5.5
• Operating Voltage (vcc): 3.0 to 3.6 or 4.5 to 5.5
• Fpu: Yes
• Mpu / Mmu: Yes / No
• Timers: 6
• Output Compare Channels: 22
• Input Capture Channels: 12
• Pwm Channels: 19
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

29.6.2.3
29.6.2.4
32117C–AVR-08/11
Overload frames
Errors and fault confinement
The channel mode is not changed when the channel is disabled, i.e. the Fault Confinement Reg-
ister (CANFC) is not cleared. Therefore, if the channel was in error passive mode before being
disabled, it stays in error passive mode when re-enabled.
Figure 29-5. Enable and Disable Sequences
The CAN protocol allows nodes to send overload frames to provide extra delay between two
messages.
User can at any time request to send overload frames by writing the Overload Request bit (CAN-
CTRL.OVRQ) to one. A single overload frame will then be sent at the end of the next message.
When transission of the overload frame starts, CANSR.OVS is set and CANCTRL.OVRQ is
cleared. At this time, user can write CANCTRL.OVRQ to one again to send a second overload
frame at the end of the first one. The CAN protocol specifies that maximum two overload frames
can be sent.
Figure 29-6. Overload Frame Request
This section refers to chapter 6 (Error handling) and chapter 7 (Fault confinement) of the CAN
Specification.
There are 5 different error types which are not mutually exclusive. Error status can be read in the
Interrupt Status Register (CANISR). Error status bits are set by hardware and can only be
cleared by user.
When the channel enters bus off state, the Bus Off Status bit (CANISR.BOFF) is set. In this
state the channel can no longer communicate on the bus. The channel can leave bus off state if
it detects 128 occurrences of 11 consecutive recessive bits on the bus.
The Last Selected MOb Status field (CANISR.LSMOB) identifies the MOb that was selected
when the error occurred. For some error types, a MOb has not been selected yet when the error
occurs. In this case, CANISR.LSMOB returns NONE.
CANCTRL.OVRQ
CANSR.OVS
CAN bus
user write
data or remote frame
CANCTRL.CEN
CANSR.CES
CAN bus
enable request
(user write)
user write
data frame
overload frame 1
bus idle
overload frame 2
disable request
data frame
(user write)
data or remote frame
AT32UC3C
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