AT90CAN64-16MU Atmel, AT90CAN64-16MU Datasheet - Page 417

• Manufacturer Part Number: AT90CAN64-16MU
• Description: IC MCU AVR 64K FLASH 64-QFN
• Manufacturer: Atmel
• Series: AVR® 90CANr

Specifications of AT90CAN64-16MU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: CAN, EBI/EMI, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-VQFN Exposed Pad, 64-HVQFN, 64-SQFN, 64-DHVQFN
• Processor Series: AT90CANx
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: 2-Wire, SPI, USART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 53
• Number Of Timers: 2
• Operating Supply Voltage: 0.5 V to 0.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATDVK90CAN1, ATADAPCAN01
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• For Use With: ATSTK600-TQFP64 - STK600 SOCKET/ADAPTER 64-TQFP770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAGATDVK90CAN1 - KIT DEV FOR AT90CAN128 MCU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7679H–CAN–08/08
Let’s consider 4 sections in the Flash, described below:
Table 33-1.
Failing cases :
7. CAN acknowledge error in 3-sample mode with prescaler =1
6. CAN transmission after 3-bit intermission
Bootsize=4096 Words
Bootsize=2048 Words
Bootsize=1024 Words
Bootsize=512 Words
LPM instruction
LPM instruction
LPM instruction
LPM instruction
Problem fix / workaround
If protection level 3 is mandatory, the LPM instruction must be moved outside the failing
sections.
Some acknowledge errors can occur when the clock prescaler = 1 (BRP[5..0] = 0 in
CANBTR1 register) and the SMP bit is set (CANBTR3[0] = 1 in CANBTR3 register). That
can result in a reduction of the maximum length of the CAN bus.
Problem fix / workaround
If BRP[5..0]=0 use SMP=0.
If a Transmit Message Object (MOb) is enabled while the CAN bus is busy with an on going
message, the transmitter will wait for the 3-bit intermission before starting its transmission.
This is in full agreement with the CAN recommendation.
If the transmitter lost arbitration against another node, two conditions can occur:
- At least one receive MOb of the chip are programmed to accept the incoming message. In
- No receive MOb of the chip are programmed to accept the incoming message. In this case
Problem fix / workaround
Always have a receive MOb enabled ready to accept any incoming messages. Thanks to
the implementation of the CAN interface, a receive MOb must be enable at latest, before the
1
immediately after the 6th bit of the End of Frame field. This will leave in CAN2.0A mode a
minimum 19-bit time delay to respond to the end of message interrupt (RXOK) and re-
enable the receive MOb before the start of the DLC field of the next incoming message. This
st
this case, the transmitter will wait for the next 3-bit intermission to retry its transmission.
the transmitter will wait for a 4-bit intermission to retry its transmission. In this case, any
other CAN nodes ready to transmit after a 3-bit intermission will start transmit before the
chip transmitter, even if their messages have lower priority IDs.
bit of the DLC field. The receive MOb status register is written (RXOK if message OK)
Flash memory sections
From memory
space
D
B
B
A or C
T o me meo ry
space
B
D
B
A or C
M e m o r y
s p a c e
Application
0000h-2FFFh
0000h-37FFh
0000h-3BFFh
0000h-3DFFh
A
:
Bug comment
Allowed but should not be valid
Allowed but should not be valid
Not allowed but should be
Not allowed but should be
M e m o r y
s p a c e
Application
3000h-3FFFh
3800h-3FFFh
3C00h-3FFFh
3E00h-3FFFh
B
:
AT90CAN32/64/128
M e m o r y
s p a c e
Application
4000h-6FFFh
4000h-77FFh
4000h-7BFFh
4000h-7DFFh
C
:
M e m o r y
s p a c e
Bootloader
7000h-7FFFh
7800h-7FFFh
7C00h-7FFFh
7E00h-7FFFh
D
:
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