AT90CAN32 Atmel Corporation, AT90CAN32 Datasheet - Page 258

• Manufacturer Part Number: AT90CAN32
• Manufacturer: Atmel Corporation

Specifications of AT90CAN32

• Flash (kbytes): 32 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 53
• Ext Interrupts: 8
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 2
• Can: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 2
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 8
• Input Capture Channels: 2
• Pwm Channels: 7
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

19.10.9
19.10.10 CAN Bit Timing Register 3 - CANBT3
258
AT90CAN32/64/128
CAN Bit Timing Register 2 - CANBT2
The period of the CAN controller system clock Tscl is programmable and determines the individ-
ual bit timing.
If BRP[5..0]=0, see
Point(s)” on page
• Bit 0 – Reserved Bit
This bit is reserved for future use. For compatibility with future devices, it must be written to zero
when CANBT1 is written.
• Bit 7– Reserved Bit
This bit is reserved for future use. For compatibility with future devices, it must be written to zero
when CANBT2 is written.
• Bit 6:5 – SJW1:0: Re-Synchronization Jump Width
To compensate for phase shifts between clock oscillators of different bus controllers, the control-
ler must re-synchronize on any relevant signal edge of the current transmission.
The synchronization jump width defines the maximum number of clock cycles. A bit period may
be shortened or lengthened by a re-synchronization.
• Bit 4 – Reserved Bit
This bit is reserved for future use. For compatibility with future devices, it must be written to zero
when CANBT2 is written.
• Bit 3:1 – PRS2:0: Propagation Time Segment
This part of the bit time is used to compensate for the physical delay times within the network. It
is twice the sum of the signal propagation time on the bus line, the input comparator delay and
the output driver delay.
• Bit 0 – Reserved Bit
This bit is reserved for future use. For compatibility with future devices, it must be written to zero
when CANBT2 is written.
Initial Value
Initial Value
Read/Write
Read/Write
Bit
Bit
7
7
-
-
-
-
-
-
259.
Section 19.4.3 ”Baud Rate” on page 242
PHS22
SJW1
R/W
R/W
6
0
6
0
PHS21
SJW0
R/W
R/W
5
0
5
0
Tprs = Tscl x (PRS [2:0] + 1)
PHS20
R/W
0
4
4
-
-
-
Tscl =
Tsjw = Tscl x (SJW [1:0] +1)
PHS12
PRS2
R/W
R/W
3
0
3
0
clk
BRP[5:0] + 1
IO
frequency
PHS11
PRS1
R/W
R/W
2
0
2
0
and
PHS10
PRS0
R/W
R/W
Section • ”Bit 0 – SMP: Sample
1
0
1
0
SMP
R/W
0
0
0
-
-
-
CANBT2
CANBT3
7679H–CAN–08/08